Van Halen Tribute Amp

[crgfrench]

I decided to build a high gain 20W 1x12 combo to get that Brown Sound. It will be point to point in a Hoffman Stout chassis, with fixed bias for a pair of 6V6GT output tubes. Feeling pretty happy that the iron fits the chassis perfectly, won't even require any mods at all.

20201114_002846.jpg

[Bieworm]

Looking forward to following this thread already!!!

[Riffmonster]

Awesome project!!
I will follow it carefully and wish you good luck with the build! With schematic are you starting off with?

[geoff 1965]

cool! part of his signature was dialing in the voltage with a variac so are you going to use VVR? what's the spec of the transformers Craig?
sad loss along with Peter Green and others this year!

[ViperDoc]

Dave Friedman also noted that in addition to lowering the AC voltage, EVH would rebias the output tubes to proper current.

[JMPGuitars]

Dave Friedman also noted that in addition to lowering the AC voltage, EVH would rebias the output tubes to proper current.

Proper current for what/when? That's an ambiguous statement for somebody using a variac.

[crgfrench]

Eddie was quoted saying they recorded at 89VAC mains, but the live settings varied with the venue.

[crgfrench]

With schematic are you starting off with?

Thanks -- I drew up my own schematic for it based primarily on the Ceriatone Son of Yeti layout. It's basically going to be a P2P version of the Son of Yeti in a Hoffman Stout chassis.
EDITED: R19 in the first schematic I posted should not be in the circuit, I deleted it and re-uploaded the corrected image.

Screen Shot 2020-11-14 at 7.40.51 PM.png

[crgfrench]

Here is the plan for the control panels

Screen Shot 2020-11-14 at 3.39.42 PM.png

[crgfrench]

...are you going to use VVR? what's the spec of the transformers Craig?

Not VVR, just a "Variac emulation" applied to the small AC signal instead of the large AC power source. You can see it in the schematic. I'm using the Lunchbox tranny set from Promitheus.

[Riffmonster]

With schematic are you starting off with?

Thanks -- I drew up my own schematic for it based primarily on the Ceriatone Son of Yeti layout. It's basically going to be a P2P version of the Son of Yeti in a Hoffman Stout chassis.
EDITED: R19 in the first schematic I posted should not be in the circuit, I deleted it and re-uploaded the corrected image. Screen Shot 2020-11-14 at 7.40.51 PM.png

The schematic looks very interesting! What exactly does the saturation switch do? I am not really familiar with anything like it. Thanks, I hope the project is progressing well!

[crgfrench]

Saturation switches in a pair of zeners configured as clipping diodes. 2 different pairs to choose from.

[Bieworm]

Saturation switches in a pair of zeners configured as clipping diodes. 2 different pairs to choose from.

Are the zeners still to be determined ? They're not specified on the schematic

What are the functionsof lava and magma?

[crgfrench]

Are the zeners still to be determined ?

a pair of 1N4739s and a pair of 1N4747s

What are the functions of lava and magma?

Magma sits DEEP in the bottom end of a volcano.
Lava spews HIGH out of the top end of a volcano.
Plain amplifiers sometimes label these "resonance" and "presence".

[Riffmonster]

Thanks for clarifying, makes sense!