The Amp Garage

A few more

Currently have this on the bench. Owner says that after 15-20 minutes it fades out.
Two things I noticed straight away:
• .1uf input on the phase inverter
• .33uf coupling capacitors
No shortage of bottom end here!

Aaron

he's using a tube screamer in the solo that's why it's 'howling like a Dumble' you can see him bend down and adjust it when he starts the solo and kicks it in. great guitar swap by his tech :) M Here you go Marus 2:51 in.. doesn't miss a beat :D Right to Scotch// https://www.youtube.com/watch?v=3wo...

The 47k slope resistor doesn’t scoop the mids in the Bluesmaster as much as the other circuits with 100k/150k slope so has less of an effect.

Aaron

I think Charlie is referring to the 2 x 550uf filter caps.

Yes, 5AR4 rectifier

shane wrote: ↑Fri Nov 13, 2020 10:25 pm Aaron:
did you get chance to post those voltages yet.

Dorrisant:
Have you had a go at one yet

Hi Shane,

Revised schematic with voltages are on page 2.

Thanks,
Aaron

Hi Dorrisant, The node after the 1k does go to the screen. The three other tubes, 12AX7-preamp, 12DW7-reverb and 12AX7-PI all run off the node after the 10k. I forgot to take pictures before it was picked up. But it was mostly point to point from tag strips. I wasn’t even gonna attempt a layout :lol...

Just realised I didn't do the DC heaters and didn't finish doing the rectifier in the Monarch. Will update once I've finished it.

I haven't measured voltages yet, but this is for anyone who needs a schematic for repairs or servicing.
And the Dizzy Bird reverb unit.

Thanks,
Aaron

EDIT: revised schematic with voltages

What a coincidence, I have one on my bench at the moment as well! I think there is a wiring mistake in this one though - perhaps you could help me confirm. The plate resistor for the second stage is only 10k, and it's also connected to a 100k resistor that goes nowhere... There is a 0.1u cap going ...

Have one of these on the bench at the moment. Just finished tracing it. This one has a paraphrase inverter.

Thanks,
Aaron

TroyBoy wrote: ↑Sat Oct 17, 2020 1:26 am He prefers not to. I’ve known Paul for a while and he always seems happy to help me out on a project or two...

Yeah, that's what I was told. I think he's the only one who knows how to wind them, or along those lines?

Hi Troy,

I was chatting to a friend a few weeks ago about Voller transformers. He didn’t know if they were still winding them.
I was thinking of getting some made, keen to hear how your build sounds.

Thanks,
Aaron

Hi Phil,
I can’t see the 100k feedback resistor on your schematic.

Charlie,
You’re right, I can see the capacitor wire bent back round on the Jazz/Rock switch on another photo.

Thanks,
Aaron