Check out our sponsor, Native Sons Goods. Use the coupon code GUITOLOGIST10 for 10% off your entire order. They sent me a couple of the new 3" straps to check out, which I'll do in another vid. www.nativesonsgoods.com/
@Andy_Yates5 жыл бұрын
I've got a couple of their straps now with the hemp backer. They're beautifully made and have consistently looked even better in person (even with the quality photography they have). The guitars stay secure with that backer too so I'm not fighting neck dive
@TheGuitologist5 жыл бұрын
@@Andy_Yates Thanks for supporting the sponsor, Andy. I agree, these are the absolute highest quality woven straps I've ever laid hands on, and I have a large collection of them!
@Andy_Yates5 жыл бұрын
@@TheGuitologist Yeah I remember watching your video a while back on them. I was thinking they're a little spendy, but I took a chance. When it arrived, I was like, ok this is awesome. I get it now. I have 4 of them now and I kinda want them all haha. Everything in stores just feels cheap by comparison, even stuff that is comparably priced or more expensive
@TheGuitologist5 жыл бұрын
@@Andy_Yates They are a luxury purchase for sure.
@wayshot5 жыл бұрын
I just ordered two straps; Lefty and Eden. Been wanting a Lefty strap for a long time because of the nice pattern and colors. Besides, I am a lefty, so that one may be the ultimate strap for me :-)
@fuzzmountain75833 ай бұрын
I know this is a 5 year old video but I still wanted today thanks for this great tip.
@Boffin555 жыл бұрын
If you just solder a 1 Ohm resistor, across the probe wires, then if your meter fails (or isn't connected) it still works, and instead of measuring current, just put it on the Voltage range instead of current, you'll get current (as the voltage across 1 Ohm is the current flowing through it....) V = I . R (and R=1)
@TinwhistleD Жыл бұрын
Thank you Amigo! This is brilliant. I have a completely blown EL34 from a Second Hand, Orange Rockerverb 50 MK11 which I am trying to repair. Now I am going to construct what you have just described. All the best. Keith from Liverpool UK.
@glenwhatley41253 жыл бұрын
I have a few of these i made a while ago. Great idea. I used the black plastic octal base that Antique Electronics Supply offers for a few bucks and the PC mount Belton Micalex tube socket that just has straight long pins. I bent out pin 8 on the socket then inserted the rest of the pins into their respective spots in the octal base. Then soldered a 1 ohm resistor into the base pin 8 along with a piece of stiff wire. Connected the other end of the resistor to the bent out pin from the socket. Then all you need is a volt meter to measure the millivolts across the 1 ohm resistor. The reading of course translates directly into milliamps. This way you don't need to keep the meter connected. If you have two of these adapters you can then merely move the meter to the other tube without disrupting the operation or even putting the amp in standby. You should put some shrink wrap on each pin and wrap the whole thing in some kind of tape to keep from electrocuting yourself accidentally. I suppose you could get the octal tube socket saver (for tube testers (also available from Antique Electronics) and Dremmel a slot in the side of it right where pin 8 is and add the resistor there, thereby automatically have the high voltage pins out of reach. Nice demonstration... Mars Amp Repair
@bullwhipjohnson82475 жыл бұрын
That's a pretty good tip. I've shorted out the ameter function on my Fluke a couple of times trying to prode bias current while the Amp is on.
@robertcalkjr.83255 жыл бұрын
Thanks Brad! We can always use more test tools and equipment. The cheap test leads are usually the weak link that makes DMM's look bad. I personally do not trust cheap leads or wiring for anything.
@robertcalkjr.83255 жыл бұрын
Yep. I only buy test leads and probes from Probe Master now. And I have my own wire to make test leads with and I solder the alligator clips on. I made the leads for my DC bench power supply myself.
@michaelnorred14955 жыл бұрын
Just as a note, instead of breaking the glass envelope, you can unsolder the pins and pull the tube wires out, then solder the jumber leads into the pins. Aslo If you have a tube with the tall sides from the pin base, you recess the socket into the base and make a little neater.
@TheGuitologist5 жыл бұрын
Thanks. Only problem with the tall base is it extends the height of the unit, making it difficult to insert into some heads.
@hkguitar19845 жыл бұрын
Super Useful DIY. If you own a tube amplifier you absolutely should learn how to check the bias. Great video, thank you.
@themongoloid89445 жыл бұрын
Sooooo glad you made it back!!!! We missed you man. !!!!!! I want you to get 200k subscribers by Black Friday. !!!!
@TheGuitologist5 жыл бұрын
I think my channel is a bit too niche for that, but we'll see. Never say never, right.
@soapboxearth2 Жыл бұрын
Thanks so much for all the great content ! Much appreciated! I started watching without the slightest clue about amps whatsoever but jow I'm proficient with head scratching... lol . I have learned a lot though. Also another fan of yours LowHeadRoom has been a huge help as I have completed my first build a 5e3. His tutorial was a Godsend. I built a current limiter , a cap discharge tool and a cheapo attenuator. Works well with up to about a 40 watt amp , bigger, and she smokes like a hash joint 😆. I saw this probe video and made one recently . I biased my 73 YBA1 today as well as a Hot Rod Deville I bought that was on the fritz (for about 200 usd. The IC caps were spent and had a bad power tube. Bought some Supertech caps , cheap.). works great. Now I'm going to gut it, sell the boards and build a Chinese kit in it. 5f6a with a plexi style channel mod. Another video I saw on yt. Also a very helpful dude. .. Anyway man I want you to know aside from the entertainment you have been a huge help to many people. Cheers!
@brianyork55105 жыл бұрын
I'm finally present when a notification came. I dug it Brad. Very useful.
@TheGuitologist5 жыл бұрын
Thanks, Brian. Thanks for all the support!
@sdjgfashjasbfasd4 жыл бұрын
I watched your video this morning and decided to make this bias probe today. Works great!
@sarmtech95345 жыл бұрын
Thanks for this Brad, building one today! I initially went to use a 6550 that was red plating for this project. When I opened the 6550, the grid connection pretty much fell off at the pin. No wonder it was red plating! :) Edit: I soldered the red lead to the amp side as that's the more positive of the two.
@curtisprice980610 ай бұрын
I had to think a minute lol! Right...the output transformer (amp side) is the source of the 300-500+ volts that goes to pin 3 (plates) of both tubes or sets thereof(push/pull). Even when a voltage is negative such as bias voltage....the red lead goes to the less negative of the voltages. Example ...negative 40volts(-40) is more positive compared to negative 41 or 45volts(-41, -45)!!! Red lead goes to -40 point and the black lead goes to the -41 or -45 point.
@soldersucker15 жыл бұрын
Thanks Brad soldered one up last night worked like a charm
@CraigHollabaugh5 жыл бұрын
Hey Brad, here's an interesting thing. I was checking out your 'STUFF I USE' on amazon, when I clicked on your JVC camcorder, all your other stuff variac, dmm, heat gun, contact cleaner, etc showed up in the "Customers who viewed this item also viewed" section. You have a real influence man. Thanks for all the content.
@TheGuitologist5 жыл бұрын
Bezos knows what's up. He might be a lizard like Zuck, but he knows to listen when I make a suggestion. :)
@CraigHollabaugh5 жыл бұрын
@@TheGuitologist If your fans all buy a variac, iso tranny and the Megantz book, then I'm OK with the lizards.
@hyperluminalreality15 жыл бұрын
I made a bias probe in 1996 using an octal base from a blown Tesla tube with all 8 pins present, a ceramic clip in/lock ring style octal socket, 2 feet of zip cord, a dual banana plug and a 2w resistor that measured exactly 10.0 ohms on the same multimeter I would be using to take bias readings with. Still have the probe and use it all the time. The multimeter is long gone and so is the Beckman that followed it. Using a UT61E now. BTW, most all handheld Multimeters have the inputs spaced to accept a dual banana plug.
@BradBartram5 жыл бұрын
Wrapping the whole assembly in duct tape reminded me of 90% of the stuff my father used to make. And just to mention, if you don't have a tube or don't want to go through reclaiming the base, the same places that sell sockets also sell empty bases for not more than a buck or two each.
@TheGuitologist5 жыл бұрын
I very nearly filled the cavity with epoxy instead of using the tape. Would have been prettier.
@BradBartram5 жыл бұрын
@@TheGuitologist Glad you didn't. There's a certain charm for stuff like this if it's wrapped in duct tape.
@TheTrueVoiceOfReason5 жыл бұрын
Now, if you'd have wrapped it in electrical tape and then friction tape after that, it would match the vintage look of all those vintage amps. :)
@TheTrueVoiceOfReason5 жыл бұрын
@@goodun6081 By the time that would happen, you'd have to rebuild at least the test lead connections, at which time it would be a complete re wrap anyway. And Duct tape gets sticky over time when it is handled like that. Besides, you won't be leaving it in circuit for any appreciable amount of time anyway. And its only aesthetic.
@valvenator5 жыл бұрын
@@goodun6081 I think you misspelled "Messy Booger" :))) ................FLEX!
@travix-19695 жыл бұрын
I'm not sure why I didn't get notified of this video, I had the bell checked. Great video. Thanks.
@TheGuitologist5 жыл бұрын
Thanks Travis. I appreciate you watching my videos, man.
@alfatone26545 жыл бұрын
Cool man, I'd love to see a part two where you actually measure the bias on a ( set of ) tube(s) that is the rated value in watts for a 6V6 GT and/or a 6L6 set and show us a how one might insert a variable pot at the bias resistor(s) to use either set of tubes on the same amp. Showing us Luddites in You Tube Land how to measure the rated wattage per matched set (V=IR or some variation thereof ) would go a long way to keeping us all subscribed, like our Uncle would. I've heard how one (you) cold set these hotter or cooler (whatever one might interpret from that terminology) and actually play us some Ramones some Keith Richards or some Wes Montgomery to demonstrate WHY you bias the tube set that way afterwards would be greatly appreciated. I know you can, so go the extra mile and keep us all happy...
@stu-nix5 жыл бұрын
Thinking of you, possibly in and around flooded areas. Hope the Lindsey Family stay safe.
@BeardedBluesDude5 жыл бұрын
What a great idea. I'm gonna have to build one of these once I get to working on my old amp stash :)
@kgsalvage63065 жыл бұрын
I appreciate your idea! It took a little more than 30 minutes though. Even with everything on hand. Unless you're in 2X speed.
@TheGuitologist5 жыл бұрын
So you got one made?
@kgsalvage63065 жыл бұрын
@@TheGuitologist I actually made one the day you posted it. I had everything here. I had an octal plug that I used instead of breaking a tube. I put female banana plugs right on the test socket so I can use banana jumpers. I think I'll make one for 9 pin minis, EL84 ect. Thanks again for the video.
@PrinceWesterburg2 жыл бұрын
On Octal bases you can actually unsolder the pins and take the base off, there might be some cement in there thats hardened but its fairly easy.
@mikelucero69734 жыл бұрын
Thanks I purchased one from nobsound and couldnt get it to work, by watching your video I realized what was wrong. One of the leads was not connected and this video helped me to solder where it needed to go. Bingo, amp is dialed in. Also thanks for showing a close up of the meter and the setting itself.
@PooNinja5 жыл бұрын
home made tools from scraps.... Hell yeah that sparks joys that fixes toys :D
@kenhancock89315 жыл бұрын
200mph duck tape is tha shit!! cheers brad
@jamesmccabe87365 жыл бұрын
Thanks man. Good idea. I'm just getting into tube amp repairs. I really appreciate the videos.
@TheGuitologist5 жыл бұрын
Thanks for watching James. I appreciate you more than you'll know. Best of luck with your repair endeavors! Keep learning every day.
@tele7895 жыл бұрын
Have you ever installed bias probe points on the back of an amp? That would be a great project.
@Eric-uf8zx5 жыл бұрын
I cracked open some matched NOS WE Black Plate 300Bs for this, they will make superior probes.
@whitneyschuster24393 жыл бұрын
...damn near gave me a heart attack 🤣
@JR-et5kx4 жыл бұрын
This video made me want to buy one premade but i learned how this thing works now so atleast i understand what im doing hahaha, awesome video !!
@yusdiy5 жыл бұрын
Thank you Brad, this is knowledge of the highest orda!
@SeanKerns5 жыл бұрын
Nice tutorial! Bias probes are great.
@rkrasinski5 жыл бұрын
Please more of these video's 😎🤘
@RaviNewfarm3 жыл бұрын
Yupp, that works, just remember this thing may be lethal. You have 300-400 volts exposed in several places here, and even if you have tuned off the amp but have charge in the B+ caps you could get lethal shocks out of this. May be easy to get in touch with B+ here when you insert or pull the probe, and the other hand on the chassis to steady things since there is a bit of force required to pull or insert the probe. Could easily happen when changing over to do the other tube.. I would have made sure everything was insulated, e.g with a separate lead for the anode voltage measurement and fully shielded probe ends for the meter side, or by to inexpensive meters and build the whole thing in a box.
@theguitaramptech5 жыл бұрын
I love all you videos Brad, and I like this your probe design, but it can be very dangerous. You hinted at it in your video, but I think a "Red Alert Warning" may have been more appropriate. You will have the full plate voltage of around 450V (700V on a MusicMan) on your probes. You could have made your probe safe by putting in a 1ohm metal resistor in the cathode path and measure set your meter to volts. 35mv isn't going to hurt if you touch it.
@TheGuitologist5 жыл бұрын
I hear ya, and thanks for watching. But... Measuring at cathode is less accurate. Also, if I put a "red alert warning" on this video, what level warning belong on my regular videos where I'm prodding around inside the chassis?
@theguitaramptech5 жыл бұрын
What you're saying is true. There are life-hazards all through a tube amp. This one just made me feel a little uncomfortable. What I really like about your videos is that they are real. You show the dead-end trails we all follow, the mistakes we all make, until you solve the problem. I like your honesty
@szaki953 жыл бұрын
Alternatively you can use an octal socket relay if you don't have a salvageable tube on hand.
@LastChanceRiders5 жыл бұрын
That was awesome I've always wondered how this works. I bought a premade probe exactly like the one you just showed me how to build. But now I know exactly how it works. By the way we would love to sponsor a few of your videos. What do we need to do to make that happen? ( John - Guitar player )
@TheGuitologist5 жыл бұрын
Your probe could be measuring the current at the cathode, which is safer because no high voltage, but you can't get a plate voltage reading. Also, any current measurements taken at the cathode will be adding in the screen current to the plate current, so this is way more accurate. As for sponsorships...I'm always looking for sponsors. Email me and I'll send you a rate sheet: bradlinzy at gmail
@marcuscarrozza7329 ай бұрын
If I made one of those I would be 💥⚡🔥😶🌫️😵. I just don't trust myself doing that . I know me and I am afraid of electricity. But it's great for those who are confident enough to make one . Thanks for the do it yourself video.
@thecascadian74014 жыл бұрын
Built one today. Great video.
@EM-df6mo5 жыл бұрын
Great video. I built something similar a few years ago. I like yours a little better.
@gbass73286 ай бұрын
Good job but that way all the external wiring and the meter are all at above 450vdc. Just remembered the output dc resistance/winding voltage drop method. That's what I'll be using on amps without a cathode resistor.
@jimhough62335 жыл бұрын
Love the bias probe idea! Great riff with harmonica near beginning. That was you right!? Or what was that!?
@Oobidoobi5 жыл бұрын
Cool project. Thanks Brad.
@jjsant32505 жыл бұрын
Using the meter in line can be inaccurate unless it is verified otherwise. Who knows with that thing (which I also have.) Even a 1ohm in the cathode channel with that meter, in voltage mode, could be questionable. A 10ohm may be more accurate but would require sliding the decimal in your head. Tapping in the plate channel removes the screen factor which is good but the cathode avoids the high voltage. Lots of tradeoffs.
@whitneyschuster24393 жыл бұрын
why is using the meter in-line inaccurate if you have a decent meter? i thought this was basically the only way to directly measure current, isn't that what they're designed for?
@tchip-bc1gp10 ай бұрын
thanks , gonna do one !
@user-oy5gu8wz2n5 жыл бұрын
Great idea!I'll make it too!
@dirkayala58125 жыл бұрын
Ya, so I know I'm getting alittle obsessed when my wife is starting to get bored of me watching ur vids!;} I been laid up on sick-leave,(Quickly on the mend now though), and I must have buzzed through 10-20 vids this last weekend and definitely shared channel with old bandmate/guitar player. Completely new to the game here but I'm gonna go look at an old Packard Bell Phonocord tomorrow for bout $20bucks as potential first real project. He says powers on & Tubes light up so I figure nuthin else, I can start the Parts-Stockpiling at very least, looked like original Mic was included too. Thanks again for the Inspiration to hopefully some fun times!:)...
@richclayton57852 жыл бұрын
Liked the tunes too!
@mischef185 жыл бұрын
Great video bro. All the best
@ajm51503 жыл бұрын
Thank you! Testing today 🤩👍
@williambock18212 жыл бұрын
Thanx ,Brad!
@bobbaumeister52435 жыл бұрын
Thank you very much Brad. This tool is clever and help us. Rock on!
@jimcamp24232 жыл бұрын
Why would anyone assume the Fluke was more accurate than the other one ? If the calibration is off for either, it's off. Discussing this with another right now as to whether they should get a more expensive multimeter or not. I think all of them are going to be off by whatever the location & conditions for calibration were. That's going to vary for the power source & location where the amp is being biased as well.
@IamtheFerryMan4 жыл бұрын
I was just aboit to drop $100on the Stewmac VHT probe kit. Thanks for this!!
@cosmicray007 Жыл бұрын
Great video !!!
@DavidImrie3 жыл бұрын
Just completed one of these.. took the heartache out of smashing a valve. Thanks. I just realized the one I used had no physical pins for 1&6 so I won't be able to use it for some like el34 I think
@TheGuitologist3 жыл бұрын
Here are a couple alternatives: www.tubesandmore.com/search/node/octal%20base
@DavidImrie3 жыл бұрын
@@TheGuitologist oh neat. Thanks. I'm based in the UK but I'll try hunt some out for V2.
@ThomasACarlos2 жыл бұрын
I'd like to see someone (maybe you?) build a probe for an EL84, 9 pin tube. I like the idea of the probe sold through Tube Depot, the Bias Scout. It utilzies a 1 ohm resistor coming off the Cathode pin and a Voltage divider coming off the plate. So one probe allows you to measure (stepped down) plate voltage (in millivolts) and cathode current. Unfortunately, I cannot find a kit for this.
@rangerdoc10295 жыл бұрын
Sweet! I need all the money saving tips I can get. Did you ever find a better display for the variac? Mine lost its magic smoke from running it too low. I haven't been able to find one with separate power & input.
@TheGuitologist5 жыл бұрын
There is a hack for these. I've been meaning to hack it and make a video of that. Thanks for reminding me.
@BradBartram5 жыл бұрын
@@TheGuitologist I just upgraded my variac and added the meter along with the hack referenced. It works great and is pretty easy to do.
@TheGuitologist5 жыл бұрын
@@BradBartram I keep meaning to do mine, but just keep putting it off. Maybe I'll put it on the short list.
@budandbean15 жыл бұрын
Now this was cool, thank you Brad!
@Bob.Silverstein3 жыл бұрын
I am curious - why don't people expose a probe point for Pin 3 as well, so that it's possible to directly measure Plate-to-Cathode voltage in cathode-biased amps? I know that for fixed-bias, the cathode is grounded, so your plate voltage tells you all you need to calculate dissipation. But for some amps (e.g. Champs, Tweed Deluxe), you'd need to make a separate measurement of the cathode voltage and subtract it from the Plate voltage. Thanks for posting this video!
@vtrohatv54472 жыл бұрын
Because the number out in negative?
@mattliebenau90835 жыл бұрын
Cool. Good tip. Maybe a dumb question but if you're working with paired tubes would it be worth it to make 2 testers?
@TheGuitologist5 жыл бұрын
If you want to take the time to make a second one, it'll save you time in the long run, but you can do it with just one probe.
@sisajtegabre3 жыл бұрын
Great video, saving guitars from a trouble and saving them a lot of $.
@TheDogPa5 жыл бұрын
I think I'd prefer a connection that lets me put the leads into a female socket, not have a male one exposed, but great video and glad to see you here today. Can you do me a favor? Explain to Henning Pauly how to do an ad that won't make me change the channel....LOL!
@Iam_Dunn5 жыл бұрын
Hardest part for me was finding an octet socket. Pretty hard to find wayyyyyyyyyy up here in Northern Ontario. So, I bit the bullet and ordered a cheap one from RipOffexpress.... oops I mean Ali.....not so express... LOL :)
@isodoublet5 жыл бұрын
Amazon has them.
@timmyv6945 жыл бұрын
Thanks for this video :) I’m making one these for sure
@tomfoolery20825 жыл бұрын
I got that same meter at home depot for nx to nothin but it does a good job,, yep gona do it thx.
@dennispennell5 жыл бұрын
Cool tip, great idea!
@richardweinberger27565 жыл бұрын
This is some classic Guitology, for sure !! If I wanted to make an adapter for a 6BQ5 could I use the same concept only with the other type of socket arrangement? You can still use your cheapie meter for other tasks by plugging in another set of leads. Very wise. I have a few of those myself, if you buy something for 99 cents they give you the meter for free. Thanks, Harbor Freight :)
@mobicus15 жыл бұрын
Great hack! Thanks for this!
@BuhdaPunk2 жыл бұрын
If you post the measurement I can cad something so it can be 3d Printed.
@cyb3r3vil305 жыл бұрын
Got to say pretty nifty TFS
@kennygoody58625 жыл бұрын
Dude i wasn't getting notified of your new videos.
@TheGuitologist5 жыл бұрын
I know. KZfaq has turned me off.
@lowheadroom Жыл бұрын
Hey Brad, didn’t you find some octal sockets with pins that you can use in place of the broken tubes? Also great video as always man
@chrisf62165 жыл бұрын
Thank you for sharing/posting - awesome! Once upon a time, I might have bought the GT Tube kit which includes that fancy widget shown here. I think I paid more than $50 for it... and no DMM included.
@michaelanderson55602 жыл бұрын
Thank you - this is very helpful! Can you clarify the setting and connection for the plate voltage?
@TheGuitologist2 жыл бұрын
If your amp is NOT cathode biased, you can just hook a second meter to measure plate voltage from one of the plate leads coming off the probe to chassis ground. that will measure your plate voltage. If your amp is cathode biased, you'll have to open the amp and measure from plate to cathode.
@michaelanderson55602 жыл бұрын
Thank you again!
@scottpeters44012 жыл бұрын
I have one of these bias probes..it came with 2 probe cables,but they have a 1 ohm,2 watt shunt resistor built into the cable…What is the purpose of that??…I ask because I need 2 more probes,and was just going to build my own…
@philipdecatanzaro18225 жыл бұрын
For the price of test sockets this is a more viable alternative. I've been seeing stupid prices on EBay for them.
@seanwingate57345 жыл бұрын
You should do a review of the Stage right Tube amp. Maybe mod it.
@TheGuitologist5 жыл бұрын
If that's that Monoprice thing, it's already been overdone, I think. I thought about getting one to mod, but there were already a lot of vids on those up. If someone wants to send me one, I'll do it, otherwise, I'll pass on buying one to review.
@BuhdaPunk2 жыл бұрын
what about voltage, what is the max voltage the meter needs to handle?
@paulcargo42335 жыл бұрын
Purt neat.
@keithfields11783 жыл бұрын
Curious, how did you get solder to stick to the original stems from the tube as they are normally coated for heat dissipation and solder won’t stick to them? With the plate current measurements, are they the values needed to adjust the overall biasing required by the tube and controlled adjusting the reostat provided for biasing? Is the current a more accurate value for biasing than observing and adjusting voltage?
@kevingriffin88545 жыл бұрын
Hey Brad. Youve got this funky japanese bass. Ive got the same one. But just the body. Do you know what brand? Also what do you think of the pickups? Would it be worth hacking them into another bass?
@peterdavies53585 жыл бұрын
Hi, a bit slow here in the UK but I just got told, honest.
@AMSOfficial794 жыл бұрын
so... biasing is as simple as using the homemade probe and using the bias pot(s) on my amp to tune the bias to my amp's recommended settings?
@anks8885 жыл бұрын
Not sure telling people to use a cheap multi meter measuring on the high voltage side. Much safer to measure the cathode side or better yet put a current sense resistor in it
@TheGuitologist5 жыл бұрын
It is safer, and I did consider that; however, you cannot measure the plate voltage that way. Also, measuring current at the cathode is less accurate because it's adding the screen current to the final figure. This way allows you to calculate the actual plate dissipation of each tube using the two measurements - current and voltage.
@frustro43233 жыл бұрын
just made one
@rickya38775 жыл бұрын
Very cool,thanks
@navigator37442 жыл бұрын
If I wanted to make a bias probe like yours but for an EL84 tube, then would I do to pin 7 (the anode plate pin) what you did for pin 3? Am I understanding this right? Then I would measure the plate current and voltage the same way you did? Am I understanding this right?
@TheGuitologist2 жыл бұрын
Correct. You're just breaking the plate connection and inserting an ammeter in series.
@TheGuitologist2 жыл бұрын
Make sure you also leave a way to connect to the cathode from outside the amp. That'll make it easier to measure the bias on cathode biased amps.
@navigator37442 жыл бұрын
@@TheGuitologist Okay ... I don't understand that, except that in an EL84, pin 3 is the cathode and "suppressor grid" (whatever that is). You didn't get into that is this video did you? I am going to watch it again, a couple of more times. One problem I'm seeing is that a tube base or plug is not available for nine pin tubes like the EL84 whereas they are for the octal type tubes you used in your video. And an EL 84 with the top broken off is too small for soldering a socket to it.
@DBCisco5 жыл бұрын
I have a professional tube tester from the 70s. This probe is a lot cheaper. ;)
@TheIulianx20002 жыл бұрын
Can you describe the solder correspondence of the two connectors? Example: Octal Connector mother pin 1 sticks to the pin ....... Honestly, I have no experience and I don't understand well from the video. Sorry.
@francisangrignon59145 жыл бұрын
Hey ! Great video ! Question for you, is it possible that I need to change the position to be mesured depending on the tube or the circuit? Or position 3 should do it ? Thanks ?
@TheGuitologist5 жыл бұрын
Use the position shown in the video and that'll work for all tube types.
@DetroitWrecker6665 жыл бұрын
Pretty cool!
@martinkk29433 жыл бұрын
So how do I bias the tube with that?
@chkao595 жыл бұрын
Can I use the BV1.0 line not the 16awg line? Thank you.
@gerthalberg97355 жыл бұрын
Hi Brad, from the look of your solder joints you’re using lead solder. What temperature do you set your iron to??
@uncled39 Жыл бұрын
Stun
@feffryjeffjeff5 жыл бұрын
Will that work on EL34 's
@Dustyfingers5 жыл бұрын
What Fluke model do you have? I think my Fluke 83 iii only goes down to 400ma.
@p_mouse86765 жыл бұрын
The Guitologist. How is that soldering iron doing so far, using it on a pretty regular basis (daily?) ?