Possibly these

I will order those resistors 330 ohm & 4.7k ohm. Schematics don't say, but what type of resistor should I be using "Carbon Film" or "Metal Film". Also what watts should I order those resistors in? The attached picture shows where these resistors have been mounted on another amp and I will do the same to mine.

330 ohm shows mounted on R29,R30
4.7k ohm shows mounted over D5

Hi everyone,

I'm currently working on a personal solid-state amp project, and I'm drawing inspiration from some of the classic transistor amps I've always admired. In particular, I'm looking for the complete schematics of the following models:

Randall RH200 G2 / RH100 , etc

Peavey XXL Transtube

I already have the power amp sections, but what I really need now are the full schematics, especially the preamplifier sections, which are key to capturing the character and tone I'm aiming for in my build.

If anyone has access to these schematics or can point me in the right direction, I'd really appreciate it. I'm also open to sharing schematics or technical info in exchange if that helps.

Thanks a lot in advance!
Raul

Quote from: g1 on June 10, 2025, 10:37:12 AM

Quote from: Rkskaas on June 09, 2025, 08:24:03 PMI am getting 1.3v between TR4, TR5 base pins

How about resistance?

27.76k ohms

Quote from: Rkskaas on June 09, 2025, 08:24:03 PMI am getting 1.3v between TR4, TR5 base pins

How about resistance?

Here it is from the Guitar Amplifier Handbook

You cannot view this attachment.

Quote from: g1 on June 04, 2025, 11:00:51 AMNo, my mistake.  I meant from TR4 to TR5 as you suspected.
You can measure at the pad if transistor is removed.  Also you can measure at R29 and R30 where it has been installed in that other photo.

I am getting 1.3v between TR4, TR5 base pins with no R74 or R73 resistors installed

Google says 19 gauge or better. I usually just hack the end off an IEC cable since I have them laying all over the warehouse. 1.8 amps isn't a ton of current, so most any power cable within reason should be able to handle it.

I have a intermittent Channel on my Kay model 761 combo amp with germanium transistors. I'd like to find a schematic to fix it because it's a great sounding amp

Looking to replace the original 2 prong power cord with a 3 prong ground plug.
The metal plate on the back of the head reads....Output= 100w RMS...Primary= 120V...
FRE= 60 Hz...Input 1.8 Amps.
Where can I find a power cord thats compatible with the above information?
Thanks.