There are tube pedals that cost ten times more but they sound quite similar. Nice job!

Thanks for the tip and great tone !

Hey thanks for all your videos. My favorites have been the schematic analyses, as a rookie hobbyist. Not sure if this would interest you but I would love a breakdown of a small tube preamp like this. Or even a FET preamp. Or any breakdown at all haha (your Electra video got me through my first few builds)

This is great! Good old DIY spirit! Rock on

I did something similar, but I found a cool preamp pedal and used one of the Fosi mini amplifiers and got about 120w at 8ohm mono. Built it into one amp head case. Sounds pretty cool.

That gain stage breaks up nicely.

Good experiment bro....thank for video...

It's typical that 1 tube in the gain staging is all it really takes to deliver the valve characteristics most guitarists are after. I have a fair amount of tube gear and tube heads and bought the kit to run on my solid-state effects loop since it's in the end of the signal chain before outputting to the power amps stage. I actually went to college for electrical/electronics engineering, but kits are sometimes a good place to start before designing circuits from the ground up. *For $13 on Amazon, it's ultimately cheaper than buying all of my own parts and cannibalizing a free schematic online.* Your demo shows it delivered the tube texture people are after, so it's not $13 wasted.

Fantastic experiment man, probably adjusting the value of cathode resistors/capacitors you can modify the headroom and the clipping according to the guitar frequencies. Keep on bluesing man!

In many events, adding 4v/v (12dB) gain gives sweet improvement. More than 10v/v (20dB) gain tends to harder setting up.

Very interesting! I think you could do some grounding that would reduce hum.

Yeah, tone adjustment would be good. I'd prefer a mid/treble boost, I play Tele country twang.... so I'm always looking for a boost like that. Love to basic sound of it. Warm.

They are $30 now. I have ordered the $15 square version kit to attempt something similar as the input to a hybrid guitar amp with a ton control module and a class D amp.

It would be great to get more drive ( distortion) with less noise. I think this is a great start to a DIY distortion pedal, yet it is still noise reduction is a must. You could play around with the caps and try to rid it of noise but still get that distorted sound. Nice project.

interesting. the small cheap tube amp added way more in quality tone than its price.. nice job

very cool, totally convincing!

Very nice video,wondering what we can achieve if we stack 2 of these in series 😅

Really gives me Vox AC30 vibes the way it sounds tbh

This sounds excellent!! I wonder what 2 of them would sound like?

here is a tip, since this needs a low voltage power supply and you are using it for an effect.......you'd be better off applying this to an amplifier board in a modern amp that uses an IC based solid state reverb in its circuitry. Point being, the power rail for the IC could be tapped as your power supply for this tube board. This seems to be a chinese tube set up for each tube to operate as a triode.....so the 2 tubes in this board would be like a 12ax7 style tube as a single tube since the 12ax7 tube family are dual triode tubes...2 triodes in one glass capsule. Keep in mind that since this is a 2 triode situation, when you run them one in to the other......the signal flips 180^ each time going from grid to plate.....so 2 triode sections puts the signal back in phase with its input at the output of the 2nd stage......and it appears to work OK with this contraption as a feeder to the front end of the amp with the low level guitar signal as its driving signal. Its a question of the quality of those chinese designed tubes and how cheap they are to get replacements. They might sound OK at low level signals, but then they could be squealers if jacked up to higher gains.....or they could go microphonic when jacked up after a period of time......they might not have designed the guts of the tube to be solid....the mica spacers and all that in the guts should keep the guts solid and not subject to vibrating....but you never know. Keep in mind I mentioned a 12ax7 family tube....as that's the easiest reference to understand as a common dual triode tube......but that would also cover the 9 pin based tubes common to modern guitar amplifiers like the 12at7's and 12au7's and 12ay7's.......each with a different MU...whether they be high MU like a 12ax7 or a low MU like a 12au7......and the points in between with this family of tubes. The MU refers to the amplification factor.....a 12ax7 is 100, a 12at7 is like 60, and a 12ay7 would be like 44. SO they step up or down for gain depending on the application needs. You don't want to overload a tubes input to make it go wacky and not operate well

Absolutely worth plug it in🎉🎉🎉2stage amplified per channel now becomes twice destorted 🎉🎉🎉

Hey kley - I’m really enjoying ur KZfaq stuff- this kinda reminds me of the butler tube drivers early on - everything’s coming back around now - u should work into a pedal - Cheers!

seemed like a great boost to kick the front end of an amp that isn't quite gainy enough, and the price is superb. good example of bang for buck diy.

I love the way you say......China.....great experiment.

This is another good video on this preamp: kzfaq.info/get/bejne/g8ubksVhssDIXZ8.html

The correct power for this preamp board is 12v AC 500ma? I ordered one but I want to power it correctly

Sounds cool. Like to have one in "volume pedal" enclosure

Go with Vox tone stack and run it into an effects loop and skip your built-in preamp

hi dear, is there possible to preamplifier a dynamic mic ou a guitar adapting a plug or respective cable? if yes, can wee add tube distortion?

did you connected the gain knob without any eletronic component? direct in the out board and out jack?

cant beat that pricing

Is there anything similar that can be used as a small low wattage power amp?

I just got one and was wondering which of the “12v” points you used as the power ground?

Tried using this plugged into a powered speaker studio monito. Cleans are good, but cant get tubes to breakup at all. Do I need something to up the input gain?

Please try with humbucker..

I wonder about using that amp to power traditional guitar pedal circuits, like you can get in the Mod kits, instead of using the transistors or op amps the kit comes with?

I need to add an adjustable output potentiometer::: What value?

sounded pretty good to me! i'm thinking about putting one in a pedal, but the shape of the board is a little non-condusive to that. maybe i could chop off the rectifier / filtering section of the board and run it on DC. i wonder what it would sound like on 9V...

How do you think this would sound plugged in a solid state poweramp?

Though there was lots of hum/buzz did you fix that?

what value/type of pot is the volume control?

This is awesome and I have questions... Do you think you could stack these, perhaps in series, to effectively have 4 gain stages? If so how so? Also, if I just use one and If I add a tone stack between the gain stages (treble, mids, bass and presence), where would be the best place to put a gain pot? TIA

sound great , only if the buzz noise was annoying , any way to get rid ? any mod needed to the board for that?

$39 now!

Update on this ? i would love to make one with a 3 band EQ to boost or overdrive the mids and highs of my Marshall.

Did you connect the guitar directly to the preamp? If yes how did you deal with the high output impedance of the guitar?. In other words, does that preamp has a high Z input?. I do ask since the clips sound very good.

Tell me that amp head is made from a brownie pan! F'N AWESOME

Doing same thing what value are you using for the gain pot? I have a 100k B ..

Can someone post a link or a model # of an AC adaptor that will work for this? Plz. :-) Sorry I lost the piece of paper I wrote down the info on. I just got the preamp today and now i dont know what AC adaptor im buying. Thanks

Im not trying to post too many comments but no one has answered my question. What AC adaptor is everyone using to power this ?

Does anyone have a wiring diagram for this?

Are those stereo 1/4 inch jacks? Or would normal guitar jacks work?

Did you ever add the tone stack?

are those 9 pin tubes? could i replace with 12ax7s?

there is NO GAIN on this , its not a pre-amp , its simply a buffer with unity gain ( ie no change )

@kley de jong can this preamp go straight into my audio interface without the need of attaching it to a poweramp or cab?

Was it ebay or Amazon?

Sounds as good as a valvecaster to be honest. If not a little more rounded. A valvecaster has a bit more of a brittle OD. Guess I’m buying one.

sounds good and looks like fun.... but my ears can't distinguish enough difference from a plain ol' tube screamer to justify carrying around a 12v AC supply

CHY-NAH

Are you chewing a gum or is it part of the guitar technique?

A lot of people will love this. But for the more decerning, the voltage is really too low to get a really good sound. Needs to be around 160 volts plate voltage. Your opinion may differ. I've built more than a few tube preamps at various voltages. It's not the only consideration, of course, but low voltage means bad tone.

Dude turn off your friggin dryer