'66 Marshall 1973 | Part 1 : Inspection and Diagnosis
Рет қаралды 11,824
9 ай бұрынLovely old gem came in for a shine.
Previous Marshall grounding videos:
Ground Schemes | Part 1 : The Ideal vs Good Enough vs Vintage Marshalls
• Ground Schemes | Part ...
'80 Marshall 2204 | Part 2 : New Ground Scheme Gets Rid of Nasty Noise
• '80 Marshall 2204 | Pa...
'82 Marshall 2203 | Correcting the Ground Scheme with the Fewest Changes Possible
• '82 Marshall 2203 | Co...
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These are things I get asked about a lot :
Amp Tech Gear Used :
Hakko FX-951 soldering station
Weller SPG 80L soldering iron (chassis work)
Rigol DS1054Z digital oscilloscope
Thsinde 18B+ digital multimeters
Kester 60/40 solder
Below are things that make this channel possible that people don’t usually think about. If any of these companies want to send me new and wonderful toys, I’m open to that. I can’t take free stuff when it comes to the amps I review, etc, but for the stuff below, bribe away!
Microphones/Audio Equipment :
Guitar Amps : Usually a Shure SM57 (exceptions noted in videos)
Bass Amps : Sometimes a Shure Beta 52, other times just an SM57
Voiceover Bench : sE Audio sE8 (small diaphragm condenser)
Voiceover Streaming : Shure SM57 with shockmount and windscreen
Voiceover Mic Arms : Elgato Wave Mic arms
Guitar Mic Stand : Gator Frameworks short weighted base stand with boom
Mic Cables and Guitar Cables : Mogami/Neutrik
Mic pre : MOTU M2
DAW : Logic Pro X on MacBook Pro 16 running Sonoma 14.0
Plugins : No effects other than level matching/normalization unless a recording
specifically has reverb etc added in post (rare, various Waves plugins)
Monitors : Yamaha HS7s
Monitor Stands : Gator Frameworks Desktop Clamp-On Stands
Monitor Isolation Mounts : IsoAcoustics Iso-Puck Minis
Headphones : Beyerdynamic DT 770 Pro (main)
Headphones : Sony MDR-7506 (alternate)
Video Equipment :
Camera : Sony ZVE-10 with SmallRig Cage (main)
Lens : Sigma f2.8 18-50mm (main)
Lens : Sony ZVE10 kit lens (rarely used)
B Camera : Apple iPhone 13 Pro (rarely used)
Tripod : SmallRig 71” with SmallRig Fluid Video Head
Streaming Mount : Elgato Master Mount S with SmallRig Ballhead
Bench Light : SmallRig RC 120D
Bench Light Diffusor : SmallRig Lantern Softbox
Bench C-Stands (light and overhead camera) : Neewer Pro SS Heavy Duty
Streaming Light : SmallRig RC 120B
Streaming Diffusor : SmallRig Parabolic Softbox
Streaming Light Mount : SmallRig 148CM Wall Mount Boom with Triangle Base
Various Other Lights : Neewer LED Panels with Neewer Softboxes
Video Software :
Davinci Resolve 18.6
Paul Leeming LUTs
Adobe Illustrator 28.0
Adobe Photoshop 25.0
Ecamm Live (streaming software)
@PsionicAudio 9 ай бұрын
The hum isn’t as apparent in the video because I forgot to turn off the 100Hz high pass filter I use on my voice mic. I’ll demonstrate the “before hum” better in the next video before showing the fix.
@seeharvester 8 ай бұрын
I knew I was deaf, but I thought, wow, my ears are getting worse.
@nonemlinus 8 ай бұрын
My grandmother owned elephants and kept them in her backyard, in Kerala, India. They were Asian elephants of course. As an American child visiting in the 70’s and 80’s I watched the mahouts feed the elephant in awe. Ana’s as we called them, usually ate piles of palm fronds, and occasionally coconuts with brown sugar. But never have I seen an ana eat an ELEPHANT CUPCAKE. Weird, isn’t it?
@grandudetonesnob7107 9 ай бұрын
Thanks Lyle! You just made my substantial cache of '68 plexiglass totally WORTHLESS!😢
@PsionicAudio 9 ай бұрын
Glad to help
@goodun2974 9 ай бұрын
Sell the old plexiglas to Sovtek; they could build (or attempt to build) Marshall clones with controls marked in Russian and call them Acrylic Cyrillic! 😉 I'll see myself out now.... Russian
@desvega5849 9 ай бұрын
"Look at it, listen to it"... That was so Spinal Tap of you.
@TheJayrgee 9 ай бұрын
I like Elephant Cupcake with my ground loops
@davidtreaster4397 9 ай бұрын
Your Plexi rant is comedy gold!
@mistermac56 9 ай бұрын
It sure was! I always shake my head when players take bits and pieces of what they read on forums and stuff and assume that every Marshall with a Plexi front panel is the same model and the "holy grail."
@jrosales2663 9 ай бұрын
I learn something new everyday. Now I know what the “plexi sound” is. Nice.
@LemmyBass 9 ай бұрын
♠🍀♥ I would like to thank you for your video with the grounding scheme that you worked out. I built three replicas of Lemmy's amps and anyone who knows Motörhead knows how extremely loud Lemmy's bass was live. I changed the grounding scheme on all three amps and two JCM900s as you describe and they are almost dead quiet even when turned up to full power. No humming, just a quiet hissing that comes from outside interference via cables and tubes, which cannot be avoided. Greetings and all the best !!! 🎸🎛😲
@PsionicAudio 9 ай бұрын
♠️
@Dr.Sheldor 9 ай бұрын
Bwahahahaha. Elephant Cupcakes? What a riot, Lyle - I love your sense of humour. Of course I've watched this far - this is great stuff!
@johnwilliamson467 9 ай бұрын
For me the 1.25 in lexan was more transparent , fuller bodied and rather bullet proof . Love the sarcasm on the plexi plate. Hope people will lean how important details are for a tech to help them get what they want.
@bambule5268 9 ай бұрын
Another lovely project! So looking forward to part 2!
@thebonebox488 6 ай бұрын
Elephant Cupcake😄 I always watch to the end.
@TheJstewart2010 9 ай бұрын
Elephant cupcake. Really looking forward to the second half of this project. I always learn something new from watching and listening to your videos. I really appreciate you sharing your insight and experience.
@ezrabuller9170 9 ай бұрын
Elephant Cupcake - really enjoy your videos, and the way you describe your processes. I own a custom built 5e3 and it sounds great. There really are some great builders out there. cheers, keep on rockin
@soapboxearth2 9 ай бұрын
Wow , a rare bird ! I'm so happy to see this kind of video!! I built a 18 watt tmb using a ceriatone layout , so , loosely based on the 1974. It is a beautiful sounding amp. Certainly exceeded my expectations... I couldn't get the sound quite right til I mounted the control panel though ;)-
@michaelcorvin4330 9 ай бұрын
Elephant Cupcake, and gain is indeed good, Mr. Gekko.
@darrylgodfrey9604 9 ай бұрын
Elephant cupcake - what an amp. A real pleasure to see a classic like this.
@spencerleehorton 9 ай бұрын
Always makes me happy when you do one of these vintage marshall take downs, you know so many gems, i have built one of the 37 versions a plexi 1968 as per ceriatone version, all works and sounds great apart from some hum which i will hope to reduce by learning from one of your videos. Keep up the sterling work Lyle, absolutly love your work, kind regards from East Coast UK.
@spencerleehorton 9 ай бұрын
this is plexi ive built: ceriatone.com/wp-content/uploads/2017/08/Ceriatone-68-Plexi50-Lead.jpg I have changed a few things as per your video on the different grounding, ive put in a chassis gnd on presence pot, at the 10uf caps which goes to the middle pot and the input chassis gnd. also i have put chassis gnd for the speaker jack which also the 1R resistors go to and the main cap gnd with txf gnd to chassis. much diminished hum now without having the bus bar, thank you.
@vayabroder729 8 ай бұрын
Elephant cupcake; love your work sir!
@weschilton 9 ай бұрын
Wow, what a rare Elephant Cupcake this is! Looking forward to seeing and hearing where you go with this one. I think I could probably use a bit of ground work in my 2203, though its not terrible.
@donciseau 9 ай бұрын
Cool video!
@jonwhittington752 9 ай бұрын
Elephant Cupcake - don’t know why - but I dig your videos and willingness to share your knowledge. Cheers
@dazako 9 ай бұрын
Several years ago I traded a 50W JMP for a 1973X reissue. The 'aged' 20W Celestion pair and larger cab improves bottom end over the 1x12 1974X. Never seen another, nor my mate's 1958X (2x10) version. Both were limited production. And though these amps are not 'exact' recreations of the originals they are great sounding. From the 1st day I found the limited tone stack liberating. Instead of making tone stack adjustments to compensate when swapping between guitars I pretty well leave the tone at 7-8 and each guitar retains it's uniqueness. I wind the vol up between 6-9 as needed and ride the guitar knobs to taste. Typically using the trem channel which is the slightly brighter of the 2. Lovely amps. If I recall the non trem channel has limited filtering ? So more prone to noise interference? It certainly has been evident in mine. Great video Lyle. I'm in my 50's so 'old fashioned' with patience and loath cell phone media. I watch every video all the way though on my pc. All the best
@traceyoungs1637 9 ай бұрын
Can’t wait to hear this one!
@markheefner8245 9 ай бұрын
Elephant cupcake. I assume a phrase that will be easy to find in search that's not likely to be used in the average comment. I always watch your videos to the end, you actually have something worth hearing all the way through
@PsionicAudio 9 ай бұрын
Thanks. I just see the stats and to get an “average watch time” of 4 minutes on a 15 minute video just kills me. So little things like this let me know the COOL people actually do watch ‘til the end.
@caiofilipini 9 ай бұрын
Elephant cupcake. Really cool amp, can't wait to hear it when you're done!
@ralphbyers6136 9 ай бұрын
I’m glad the elephant cupcakes are period correct! Excellent work!
@Robstafarian 9 ай бұрын
I love the subdued vitriol in this video; weirdly, it feels like home.
@johnboleyjr.1698 9 ай бұрын
"Follow the noise. It always noise." Elephant Cupcake flavoured Ground Loops. The classic breakfast of musicians the world over.
@richardlynch5632 9 ай бұрын
Looking forward to hearing this amp😃😎👍 😎✌👍❤🖖
@brenthorrocks 9 ай бұрын
Elephant cupcake :). Thanks for the video!!!
@Calypso993 9 ай бұрын
Elephant cupcake, nice gear and nice work.
@riknbkr330 9 ай бұрын
As I'm sitting here, playing my Casino, with an Elephant Cupcake at my side....I can only dream of plugging the Casino into that amp, and what harmonious, melt the Elephant Cupcake, sounds I could get out of it. Can't wait for the next part!
@travismccartney 9 ай бұрын
I went to the fair with my family yesterday. We shared an elephant ear but alas, no elephant cupcake was to be found. Next time perhaps.
@Fxstdeuce05 9 ай бұрын
Elephant Cupcake Very informative as usual.
@qua7771 14 күн бұрын
Marshall used model numbers which would later be incredibly confusing to anyone new to them. It's part of the reason people refer to the early ones as Plexi.
@AvnerRosenstein-ULTRA-LXV 9 ай бұрын
Elephant cupcake. Whatever that is. Is this particular Marshall rare? I've never seen one like this one. Mostly 1959's or jtm45s. Love all your videos. Watched all 11 parts of your 1959 remade videos. I actually prefer to watch your stuff on my TV than Netflix etc. Great stuff!
@PsionicAudio 9 ай бұрын
It’s a fairly rare model, certainly in the State, and it’s from the first year of production seemingly. Will date the pots soon as the transformer print faded decades ago. Thanks so much!
@ACockburn1967 9 ай бұрын
Great vid, going to grab an Elephant Cupcake while I digest the ground loop learnings ...
@blondegraemey 9 ай бұрын
Elephant Cupcake. Can't wait to hear it, if you're prepared to demo after the repair work.
@IAmChrisR 9 ай бұрын
Hi Ly,le! One thing that I think could potentially help draw some views to the playing videos is having some comparison audio for the before state. Like, "hey, here's some reamped playing clips through the amp before I touched anything mic'd up real good...hear that loud hum? Now here's the owner checking out the same amp after I undid all the ground loops." And present the A and B states in the same video. I'd love to hear the difference when mic'd up properly.
@Satchmoeddie 9 ай бұрын
I had a super weird plexi Marshall combo in my shop. Think of a Deluxe Reverb, NO maybe more like a 25 watt Princeton Reverb with EL34s in it. Really weird little combo amp!! It's a plexi, with a cathodyne phase inverter, and EL34s running at very low plate & screen voltages. The reverb is ECL86 pentode driven, and the tone stack is the basic high cut single tone control, but it's still a Marshall plexi. I turned one of those old weird cheap Dallas Texas made Davis PAs into what I wanted the Marshall Specialist to be more like. Full tone stack, no tremolo, and a LTP PI, but still a 25 watt EL34 amp HEAD.
@badmongleo 9 ай бұрын
Elephant Cupcake. Your Ground scheme posts are the best! I think iam on the wrong track. I was supposed to record some guitar. I got stuck in a loop, at least thanks to you it’s not ground loop related! You’re the best! A question if you have time? Iam building a 2*15 cab loaded with vintage Altec Lansing speakers. Open or closed back? Finding it hard to decide. Intended for studio and live use!
@PsionicAudio 9 ай бұрын
Cab design is really complicated and subjective. If you’re building it yourself, the best approach is to experiment with closed back vs ported vs open (and HOW open). And try it in many different rooms/spaces.
@TheBoomtown4 9 ай бұрын
I like mine quite open, gets rid of the mud and woofiness. I play at low volume in my basement. Made a cab matching a mojo 2x12 lite cab, then opened up the hole quite a bit and really preferred it. So yeah, you could experiment. Room matters too, placement in relation to wall, it all really makes all the difference unfortunately
@GetTheLedOut8585 9 ай бұрын
Made me think of Nigel Tufnel when you were showing the plexiglass. "I can't hear anytrhing..." ... "Well, you would." Really cool to see inside this gem - thanks Lyle!
@jasonkirkham550 9 ай бұрын
" Elephant cupcake " not sure I want to try one of those.
@t_mac41603 9 ай бұрын
1:49 Listen to that sustain! Well you would hear it if it was playing.
@scottwilcox6313 9 ай бұрын
Lyle, can you make some guard for the output transformer for safety? Maybe a piece of polyethylene with holes for the wires for protection. Elephant cupcakes are delicious.
@k.tucker599 9 ай бұрын
and a fine pachyderm mugbread to you too...
@GearAGoGo 9 ай бұрын
Mmmmm! Got me some plexi tone! (Homer Simpson drool sound)
@pauldavis6356 9 ай бұрын
That PLEXI tone. Now I want to put PLEXI on all of my amps - I can hear a FLEXI Fender Bassman in my future. LoL.
@johnbriggs3916 9 ай бұрын
Plexiglas (note spelling) is actually a German term (possibly a trade name) for the acrylic polymer polymethyl methacrylate [poly(methyl methacrylate)] (PMMA). Perspex was the ICI trade name, and Lucite the one for DuPont. I'm still working on Elephant Cupcake...
@johnbriggs3916 9 ай бұрын
Otto Rohm invented both PMMA and the name Plexiglas. The trademark is still owned by Rohm GmbH. Whether anyone owns the trademark in the USA is unclear.
@johnbriggs3916 9 ай бұрын
Rohm use the trademark Acrylite in the Americas.
@goodun2974 9 ай бұрын
Fiberglas is also typically spelled with just one s. Possibly trademarked that way?
@Gas-Stn-Sushi 9 ай бұрын
Oh my god who tf even cares
@goodun2974 9 ай бұрын
@@Gas-Stn-Sushi , you're entitled to your Perspex-tive.....😉🤣
@cmatte82 9 ай бұрын
What’s the elephant in the room? Could it be a cupcake??? Haha.
@jaypaulson5181 9 ай бұрын
Everything we like about a 66 Marshall, including the elephant cupcake, and that special plexi sound- come on, you know the plexiglass dampens the aluminum overtones…
@Janne19691 9 ай бұрын
Yes, the famous plexi sound is as famous as the JCM800 sound.
@pauldavis6356 9 ай бұрын
Elephant Cupcake? That's a new one. But as for people accusing you of "padding the bill", anyone that watches your videos knows that you make repairs and mods as they are needed to make the amp usable and increase it's longevity.
@SuperSeanXXX 7 ай бұрын
Are you getting any 12ax7s that sound fizzy after the amp warms up lately....like jjs maybe?
@goodun2974 9 ай бұрын
Is that turret board made of ordinary masonite, or phenolic, and does it ever become conductive?
@desvega5849 9 ай бұрын
Sorry to blow up your comment section but you mentioned that this was a 240v amp and you'd be using a step-up which makes total sense but I'm curious how safe running an ampway under voltage, say 120v, would be... I dont care about the tone, just curious on the safety of doing such a thing. Certainly not planning to do so.
@PsionicAudio 9 ай бұрын
It would be “safe” running a 240V amp at 120, you just wouldn’t hear anything really. Running a 120V amp at 240V is where the magic smoke leaves all of a sudden like.
@zbaby82 9 ай бұрын
Plexi videos are always good! 😎 Is this amp cathode biased? I was looking for but didn't see a bias pot.
@PsionicAudio 9 ай бұрын
It is. More coming soon.
@JzuHax 9 ай бұрын
Who doesn't like an Elephant Cupcake (and a '66 Marshall)? Very interested by the buzz problem, since I have _three_ very old amps exhibiting the issue at various levels.
@BenState 9 ай бұрын
Elephant Cupcake mate. nice video as usual. Is that large cement resistor near the black f&t cap a good idea? Also would it not be a good idea to fashion a cover for that transformer? Seems awfully dangerous. Nice vid Lyle.
@PsionicAudio 9 ай бұрын
Thanks Ben. That resistor isn’t original but it doesn’t get hot. A cover would be good, but vintage considerations… you’ll see my solution for that soon.
@royhale7283 9 ай бұрын
Have you done anything on PRS Arcon 50?
@stevencraig 9 ай бұрын
I will try to source an elephant cupcake before part 2 comes out
@codyleroy6839 9 ай бұрын
I wonder, would any issues arise if a person tried to build a Deluxe Reverb circuit with no tremolo or reverb…? Can these parts of the original circuit just be omitted?
@Red.be89 9 ай бұрын
I don't think I've ever seen a divided by 13 amp on your channel. Any thoughts on them? Not that I've seen an elephant cupcake either.
@markheefner8245 9 ай бұрын
Just thinking, wouldn't switching out the plexiglass for actual modern glass offer more warmth and clarity? That's how windows work. Maybe some of the old wavy glass with the bubbles in would be better for distorted tones.
@diegorhoenisch62 9 ай бұрын
Elephant cupcake(is that some sort of American invention to increase the average BMI(body/mass index) of humans)? Glass is a bad idea. Even if guitarists were always careful, their friends and roadies are not. Cheers, Alan Tomlinson
@MarioV689 9 ай бұрын
Elephant cupcakes? I'm missing something
@uncleoonie 9 ай бұрын
Elephant cupcake. Mmmm, good elephant.
@ToddRichmond 9 ай бұрын
I shudder to think about the primary ingredient in an Elephant Cupcake...
@lousekoya1803 9 ай бұрын
You really don't see those often !
@davidstorm4015 9 ай бұрын
I'm a bit confused as to why you say the UK mains plug is 'not particularly reliable'? We've had these plugs in the UK for so many years and they are perfectly reliable, one of the best plug designs in the world.
@PsionicAudio 9 ай бұрын
Not the UK plug design, but that this was a later replacement with screwed connections and a clamp that doesn’t really hold the cable securely. Replacement plugs, US, UK, wherever, aren’t a great idea.
@PsionicAudio 9 ай бұрын
I’ve talked about this a lot in previous videos so I didn’t go into detail here but I guess I should have.
@brafmetoo7560 9 ай бұрын
Elephant Cupcake!
@justinvanhook 7 ай бұрын
Elephant Cupcake 😄
@davemarquez4562 9 ай бұрын
Elephant Cupcake!!!
@jllewi 9 ай бұрын
Elephant cupcake 😎
@rickbaker4571 9 ай бұрын
Elephant what??
@kennyjohnson336 9 ай бұрын
The elephant cupcake in the room
@michaelmoore7975 9 ай бұрын
I used to chase that "plexi" sound. Nowadays I'm much better informed and chase only anodized and brushed aluminum sounds....still looking.
@fearnpol4938 9 ай бұрын
Elephant cupcake 😂😂 although I prefer faerie cakes.
@user-zr7mg7ey6j 9 ай бұрын
ground loop prob w/a marshall. design prob? good thing it wasn't a fender, huh? then it would really be a big deal.
@brettmetivier6256 9 ай бұрын
I’d eat an Elephant Cup Cake for an amp like that.
@mauricespencer1798 9 ай бұрын
I stick with it for the elephant cupcakes
@michaelinglis567 9 ай бұрын
Elephant Cupcakes, figures.
@gimmeeinboxback3860 9 ай бұрын
Elephant Cupcake's? Learn something new everyday.
@timhall7771 9 ай бұрын
Elephant cupcake?!
@t_at_large 9 ай бұрын
Let's see, how would Opus repeat that back?...Ellafrump Splungebake?
@goodun2974 9 ай бұрын
Oliphant Dubsteak perhaps? 🤔
@PsionicAudio 9 ай бұрын
Pear pimples for hairy fishnuts!!!
@goodun2974 9 ай бұрын
@@PsionicAudio , You reminded me of a review of the Nick Lowe record "Pure Pop for Now People" which some critic called "pure flop for cow people".
@troybaker1099 9 ай бұрын
Elephant Cupcake!?
@Lu_Woods 9 ай бұрын
Platypus Bagel. ; )
@tonyichiban2144 9 ай бұрын
All problems in life can be solved with more gain
@ScottyBrockway 9 ай бұрын
Elephant cupcake!
@RT81775 9 ай бұрын
Pachyderm Pastry.
@pwlebrun4573 9 ай бұрын
Elephant cupcake, with zebra icing.
@blueglobe 9 ай бұрын
Lyle. Do you know a good place to get an Elephant Cupcake?
@Steve-H 9 ай бұрын
Elephant Cupcake
@grampy666 9 ай бұрын
"We can still get the appropriate Phillips mustard" Where? Or rather where for less then $25 a cap + shipping on evilBay? Maybe SoZo at 1/5 cost? Hopefully, vintage gods won't smite me...
@PsionicAudio 9 ай бұрын
I didn’t say they were cheap.
@yernickle 9 ай бұрын
after te elephant cupcake you get the mushroom pillow....
@davidtreaster4397 9 ай бұрын
Elephant cupcake what?
@goodun2974 9 ай бұрын
I'll take a Mastodon Muffin over an elephant cupcake any day!
@Fr0stbyte89 9 ай бұрын
Elephant cupcake.
@Bat21bravo 9 ай бұрын
Ken Bran & Dudley Craven handiwork >
@oms1 9 ай бұрын
🤔 I’ve never seen a real 1973 with the ground switch?
@PsionicAudio 9 ай бұрын
It’s a very early one. www.drtube.com/schematics/marshall/18w.gif
@PsionicAudio 9 ай бұрын
They changed to standby at some point.
@itsonlyme9938 9 ай бұрын
Some of those solder joints dull and might have become dry joints.
@goodun2974 9 ай бұрын
The amp apparently sat in a damp location for a number of years, causing transformer rust and component-lead corrosion.Even solder can oxidize or crystallize in damp conditions. Solder is not impervious to air, especially moist air; and the posts, component leads and the solder itself contain dissimilar metals, therefore galvanic corrosion can occur.
mission control
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