TY Cute CAT

Hello, I bought the same amp as yours but I notice that it distorts on the normal channel once warm? Can you help me please. Thank you

Thank you guys for the comments! I was able to access to repair my 1/4” Jack.

Hi I'm new to this iv have a 5watt and a 40 watt can anyone tell me if I can make one that works for both and is it safe please n thanks

sweet cat

Silly! Go look at my mod, you'll be amazed.

Thank you. My friend just inherited a vintage 1971 Peavey 300 bass amp with an additional standard head. Unfortunately he is experiencing unwanted distortion regardless of the input jack or head used. He suspects the previous owner may have modified something in order to produce a constant distortion. I would greatly appreciate your thoughts/comments on how he could get his amp working as designed, i.e., no distortion. Thanks and Semper Fi - Ken

The netting to the speaker is literally Velcroed on there just pop it out unscrew speaker exc

I’ve notice that when I plug into the automix input…the red lights no longer light up and it seems like both channels work great and other times it’s almost like the top row works and then the bottom doesn’t. Any idea what it could be? Thanks for creating these videos on old peavey amps!

Fuses should be checked with a meter. Don’t assume it’s good just because it looks good

I have an 800 series amp super festival series 800-g that i got when i was 15 i have schematics on everything but the foot switch. have you ever figured that out? thanks

To service the power amp, you remove the speaker. The board can then be unscrewed and fed through the speaker hole.

Thanks for showing the meter mod because why have a volt meter that doesn’t start till 80 volts 👍

any chance you have a list of all the caps you changed? i have a musician 400 which i believe uses the same power module. would save me a lot of time to just have a big list of em before i recap. thank you!

I found one like that in the flea market today. Thank you for sharing your expertise and experience.

Hello what transistor replacements did you use in the preamp section ?

Coolest amp ever!!! Nice hat 🙂

I just got a 400 series and may I ask where you got the 60142 replacements?? Thanks in advance..

I have the same amp. Channel 1 has no sound. I found that all of the Elna axial capacitors have readings that are way too high. I am having a hard time sourcing replacement capacitors. Where did you find capacitors for your amp? Thank you.

I unscrewed the board trying to open it up 😟know the board just rattled

Where did you find the fuse?

Please help!!! Which direction does the 14 pin op amp face

Thank you for taking the time to post this. Apparently the resistor failure you addressed at around the 3 min mark is a problem for many of us with this amp. In my current situation, and another individual finding the same problem on their VK-112, you have saved me and others a lot of time, money, and headaches. Be sure to loop through the send/return, as it's like taking a blanket off the unit. It can cause issues with volume. This puppy screams now.

Where did you score the digital meter?

I've got a version of this amp on my bench right now and I've got a couple questions. Mine has a light bulb limiter in line with one of the speaker wires, but that doesn't seem to be present on yours. Another thing, mine is missing the 2 large white cylindrical components that are present in yours. It looks like they've either been removed or were excluded at the factory. What are they, and what is their function?

Hello, i know that this is an older video but is there anyways to drain the caps without removing the circuit board? I have the same amp and cant reach the terminal on the filter cap

I have that amplifier my uncle was a tec for Baldwin and I have a Baldwin 12 string guitar to match it and still play it.

Que trancistores yeba todos iguales numero

I just picked up one of these broken amplifiers, searched the web for hours, and was elated to finally find a repair video. Then, much to my disappointment, this video doesn't explain anything he's doing or how he fixed it or any tips. What a complete and utter waste of 10 minutes.

I see your cat turned up to lend a hand/paw lol. I’m going to do mine this week I’ve never restrung before, I got an old RG7321 the strings are very tired I’ve got a set of Ernie Ball ready to go. I’ll follow your example

Need heatsink

The front panel comes off it's only Velcro on

I got 3 bad heads from guitar center in a row. Funny how when I trade in they make sure to check every detail but when I buy it feels like they say "Hey It Doesn't Smell Like Cat Pee So Let's Not Test It And List It As Great Condition".

Um, take the speaker out maybe? Access via the big hole in the front?

Just took my almost non functioning 70's Peavey Musician 400 head into a local, very old, audio tech guy/genius.........$90 kiwi bux l8r and it's ready to crank out wallz of deafness for another 50 years- u amp doctorz R O C K!😁🤘

Great video! But what is the safest way to remove the knobs on the front panel, so you can "draw" the circuit board back and out? I have already ruined one of my knobs! I see the shafts are split shafts. But it seems they're stuck there. Special tool? In my case I have to change one of the plastic inputs out, it has cracked up and gives no firm connection.

Same problem with the preamp pedal but it's worse, in the pedal it's a power supply defect, I've gotten two bad ones with the exact same defects. Sounds like bad caps from the wrong mofset or rectifier, then the opamps start oscilating. I suspect it's Covid and post-covid chaos in China, replacing unavailable parts with other parts out of spec. They sand the part numbers off the resin cased stuff or squirt them with a bodge of goo so you can't read them. Most of the consistent forum complaints emerged after US lockdown, I thinks it's recent bad batches of everything Acoustic. MF is selling lots of the inexpensive Acoustic stuff at 50%+ off, lots of open box stuff too, likely indicates high rates of returns. (And so lovely of MF to resell defective units...)

Hi, I've got a Peavy VK 212 that only powers the red power light, no sound. Can you help recommend what I should do to test and repair it?

I follow your steps and wire it the same as the video, but for some reason I can get it to work, I move the fuse to the secondary side and as soon as I turn the variac it blows the fuse. Any suggestion?

I have seen one other video almost as stupid as this one....😁😆😅😂🤣😭

this amp has all dc heaters, all the tubes are dc heaters. never seen that

did you solve how to make it work with 100w amp? I dont know if there is a L pad rated for 200w, and if there is i wonder if it really works...

I love how the insides of these vintage solid states looked to have more in common with vintage tube amps than they do with modern solid state amps. Can almost imagine a row of tubes in place of that row of op amps or whatever they are there.

Great to see such good work, got this amp on my bench and turns out along with several bad caps, will need transistor replaced, PN: Texas Instrument R591 550 PNP transistor, I believe this transistor drives the reverb you mentioned in earlier. Any suggestions replacement / substitution for this part would be greatly appreciated.

I have built one of these and use it extensively. However, I also added in a few more high wattage resistors to share the load of power dissipation. What is that little oscilloscope by the way? Where did you get it from?

I made a mod video for this amp. Great amps.

Picking one of these up tomorrow dirt cheap glad I've found your channel excellent work matey is there any way to turn the wattage down on these amps via modification so it will play at really low volumes but still sound like a valve amp should? Keep up the good work and I hope you all the success in the future

Good job! It makes me happy to see old things brought back to life. Keep up the good work!

Thanks, I purchased one of these L-Pads and I had my concerns about its capability to dissipate 100watts

Great information and I was able to to get this working. Nice idea moving the fuse to the secondary side. If I can make some constructive criticism, the video cuts made it difficult to follow. A continuous video with slower pacing would allow the viewer more time to absorb the info. And would probably save you some time in post. Psionic Audio channel or Uncle Doug’s site are good examples.