The Amp Garage

Thanks for the replies guys. The text is a bit fuzzy, but here’s one: http://www.tdpri.com/threads/swart-ast.551853/ Looks like this is originally from this thread: https://music-electronics-forum.com/showthread.php?t=22699 Sounds like the poster did copy it from a Swart (although he never comes out...

Many thanks!

Has anyone traced a Swart reverb schematic before? The AST and a few of their other amps (maybe all of their reverb amps, not sure) use a transformerless cap-coupled reverb with a 12DW7, the AU7 side to drive the tank, AX7 side for recovery. I’d like to use this circuit in a personal project. I’ve n...

Tubedude, my apologies! I read “Have you heard of the Artemus or Marquee,” which is obviously not what you said. I have not heard either amp in person, only YouTube demos.

There’s a fellow who did a build using the Artemus cascode with decent sounding results:
https://youtu.be/nIoAKSxsXwE

Thanks tubeswell! I’ve seen you pop up in cascode discussions before. How many of these have you tried before? Is there anything special about using a 12dw7, or would a 12ax7 or 12au7 be just as good or better? (Better in this case meaning closer in sound/response to an EF86.)

TUBEDUDE wrote: ↑Tue Oct 17, 2017 11:08 pm Have you heard the Artemus or Marquee?

Yes. See my original post where I mention both these amps (which both employ a cascode in place of an EF86).

How does this look? Merlin B uses a self-bias arrangement with a 12au7 cascode near the bottom of this page: http://www.valvewizard.co.uk/cascode.html. My schematic draws from his and the Artemus schematic in my first post.

The resistor is just a plain old grid resistor, isn't it?

This looks interesting, although he uses the 12dw7 in a cascade arrangement, not a cascode: IMG_6704.PNG He does have cascodes outlined on other parts of his site, however. https://www.tubecad.com/2012/10/blog0248.htm IMG_6705.PNG https://www.tubecad.com/2012/10/blog0247.htm IMG_6703.PNG In the SE a...

I've been more enamored with the early Vox sound recently, especially the thick yet chimey sound of the EF86-equipped normal channel. I've heard nearly everyone say that the EF86 goes microphonic in a combo, however. Since I plan to build a combo, I want to skip the EF86 altogether and use a cascode...

Can anyone weigh in?

Truth be told I'll likely never run it loud enough for the output tubes to get really distorted. I'll be running it clean mostly, just as it's barely breaking up.
And silly question--if I got rid of the normal channel on this amp, would I free up an extra tube?

Anyone have the AC15HW1 schematic/layout? From the pictures I've seen it doesn't seem to be an over-complicated build. Also wondering how difficult it would be to add an effects loop.

Thanks for the replies!
Masco, what did your 1x12 AC30 weigh?

Ok, when I say simple I don't mean 5F1 simple, but has anyone worked out an AC15 with only Bass, Treble, and Volume? Or something similar?
I'm just looking for a real simple top boost sound and I want it to be light.