I attached the  instructions along with a picture of the kit in the previous post but for some reason it doesnt show up unless you click the link for the pdf.

I am reattaching the pdf file, it has the instructions, parts list, as well as some pictures of the circuit.

I ordered the kit from Antique Electronic Supply, they say that they still have them in stock.

http://www.tubesandmore.com/products/P-QTL604-AK

It didnt have a schematic with it, but here is an image of the board and parts list.

Assembled the Peavy replacement kit and gave it a go....works perfectly! <3)

I think I am finally done thanks to everyones help!

Going to reinstall the chassis into the cabinet and give it some hours over the next few days.

Thank you everyone for all of your help, there is no way I would have been able to get this taken care of without it!!  You guys are the greatest!  :dbtu:

Hoping the J175s arrive by tomorrow or Thursday, in the meantime an original Peavey adapter kit with the chip arrived today. Is it worth assembling to try or would the results be the same as the module that I already have?

I can do that, I will need to order some J175's the only FET that they had in the local shop was an MPF102.

Quote from: J M Fahey on November 25, 2012, 11:29:13 AM
I think I have a working solution here, involving a single PFet (a J175 will do fine) and a 10K to 22K resistor, but I'm leaving to a friend's "asado" , but when I get back, after adding a couple pounds of charcoal grilled beef and a couple bottles of wine to my waistline, hope will have some neurone left to draw a schematic.

I didnt think I could be hungry again after dinner but looking at this got me hungry, hope was great!

It is a peavey module, the other module advertised is the kit form with a different chip.
The module I ordered did not come with a data sheet and I cant seem to locate on online so far.

Q1 is not on the mail board, it wasnt there at all when I opened it up, I saw a post somewhere that this was some sort of optional mute function?

Did fender have their own verison of a replacement? I couldnt seem to find one unless I have some search issues.

That may be, but it wont plug in to the socket in the correct orientation to make it pin 3 or pin 7.

Pin 7 is channel 2 though, so maybe it must be pin three.

Ran on an idle for a few hours this morning, heatsinks warm, not hot.

The peavy module arrived, they had two different ones, I got the less expensive one, but It doesnt seem like it should work, the pins dont make sense when I look at it.

When it is plugged in it turns channel two on and off, but when channel two is off it doesnt activate channel one.

In looking closer at the board there is no connection on pin 6 which is what should go for channel one..maybe I should have gotten the other module.

no limiting lamp, guitar for the input, everything is working....ran for 30 minutes and all is holding.

Pulled the limiting lamp....eveything is working great...no hum, clean tone....trying a guitar in place of the ipod next.

I am still running on the limiting lamp, I should be able to up the bulb wattage to double check everything and then pull the lamp out and give it a go?

Ladies and Gentlemen we have a working amplifier!

J111 is back in the circuit, playing through an ipod both channels are now working and no hum!

There was another bad op-amp even though it wasnt pulling the 15v rails down. and a bad connection in P2 that I discovered by bumping it...I eliminated P2 after being unsuccessful at cleaning the plug ends and ran wires directly to the board.

still have to switch channels with a jumper as the replacement for the tl604 isnt here yet.

So, the two on board pots, bias, and offset, do they require any additional adjustment?

You guys have the patience of a saint to be helping me through this. 

J111 is in the circuit

I have 17mv across R79 and R81


The reverb control has no effect.

The hum goes away when I plug in to the power amp input jack.

P5-5 47v
P6-1 -47v
P7-2  18mv


I pulled J111 out and plugged the ipod into the power amp input and the went away and I have a clean tone. The hum is also gone with J111 out.

No sound goes through the normal input at this point.

The TL604 is definately bad as I loose -15v when it in in the circuit.

I inserted a higher wattage bulb, was on a 40w, now a 60w, hum still present on both channels, and with jumpers in or out of the TL604 socket.

The amp is not passing a signal, no noise from the reverb tank, the hum increases on channel 1 and channel 2 with the volume and control knobs.

Q9 is heating up, warm, not hot.

I tried running my ipod into the power amp input, there is still sound as before, however now its not clean like it was before when I tried this. Did fixing the 15v supply change something with this?

I will try some signal tracing later this evening.

Okay, jumpered and started up on channel two with the limiting lamp.....bad hum and no sound through the input...did I move too fast?