PV studio pro -old version

[drewl]

Hey, anyone have a schem for this old version of the Studio Pro, or know what the output drivers are?
They're labeled "226 M" M- being the Motorola symbol.
Standard 3 pin TO-220's

Emailed PV but dude is on vacation.

[drewl]

Well, going over the PV transistor cross-reference list for the 3rd time....
the transistors in this amp also have 0700 and 0800 under the 226M label.
They may be a PNP and NPN Darlington pair listed in the cross list.

Still waiting from a schem from PV.

[Jazz P Bass]

Can you post the schematic?
MJE 15032 should do (NPN)
MJE 15033 (PNP)
They are both 250 volt parts.
8 amps.
50 watts.

[drewl]

If I had the schematic I wouldn't be asking for help!

But seriously, it's only a 20w output amp, so I don't think they're 15032/33's.

Thanks anyway, I'll let you know when I figure it out.

[Amp Kat]

Peavey has more than one Customer Service Rep. I'm sure if Roger Crimm is on vacation Michael McKenzie could assist you try emailing him or calling direct.

[drewl]

Yeah, I got another guy who sent me a schem for something else.
I emailed him the numbers that were on the pc board and am waiting for a reply.

[Enzo]

Or just contact customerservice@peavey.com rather than specific individuals.

The schematic you need is the original Studio Pro from 1980. That information will be much more useful to Peavey than board numbers like 9880213. I have a large paper copy but no scan handy.

The outout transistors are darlingtons, MJE800T and MJE700T NPN and PNP. They are in the cros ref, but they only cross them to house numbers. Plain old MJE700/800 without the T are TO126 types. If you can;t find the 700/800, then 801, 802, 803 ought to work too. I might try TIP120/125 or 122/126 as subs

[drewl]

Well, going over the PV transistor cross-reference list for the 3rd time....
the transistors in this amp also have 0700 and 0800 under the 226M label.
They may be a PNP and NPN Darlington pair listed in the cross list.

Still waiting from a schem from PV.

That's kinda' what I figured as 15032/33's didn't work.
Made a nice sawtooth generator though.

[drewl]

I sent that info and a couple pix to peavey.
We'll see what they have.

I tried TIP 142/147 but still got the same sawtooth output.

[Steve Conner]

This sawtooth output, would it be 120Hz by any chance?

[drewl]

Nah, the sawtooth output is the frequency of what you put in, riding on the + rail.

The power supplies are clean.

[drewl]

Finally got the correct schem from Peavey.
They didn't have it scanned before.

I can see already, somebody swapped the Darlingtons in the wrong positions.

[Jazz P Bass]

Ewww!
How to make a sawtooth generator.
Interesting.