Van Halen Tribute Amp

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crgfrench
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Van Halen Tribute Amp

Post by 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.
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Re: Van Halen Tribute Amp

Post by Bieworm »

Looking forward to following this thread already!!!
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Re: Van Halen Tribute Amp

Post by Riffmonster »

Awesome project!!
I will follow it carefully and wish you good luck with the build! With schematic are you starting off with?
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geoff 1965
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Re: Van Halen Tribute Amp

Post by 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!
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Re: Van Halen Tribute Amp

Post by ViperDoc »

Dave Friedman also noted that in addition to lowering the AC voltage, EVH would rebias the output tubes to proper current.
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Re: Van Halen Tribute Amp

Post by JMPGuitars »

ViperDoc wrote:
Sat 11/14/20 12:18 pm
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.
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crgfrench
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Re: Van Halen Tribute Amp

Post by crgfrench »

Eddie was quoted saying they recorded at 89VAC mains, but the live settings varied with the venue.
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Re: Van Halen Tribute Amp

Post by crgfrench »

Riffmonster wrote:
Sat 11/14/20 7:40 am
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
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Last edited by crgfrench on Sat 11/14/20 7:46 pm, edited 1 time in total.
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Re: Van Halen Tribute Amp

Post by crgfrench »

Here is the plan for the control panels
Screen Shot 2020-11-14 at 3.39.42 PM.png
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Re: Van Halen Tribute Amp

Post by crgfrench »

geoff 1965 wrote:
Sat 11/14/20 11:27 am
...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.
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Re: Van Halen Tribute Amp

Post by Riffmonster »

crgfrench wrote:
Sat 11/14/20 3:28 pm
Riffmonster wrote:
Sat 11/14/20 7:40 am
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!
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Re: Van Halen Tribute Amp

Post by crgfrench »

Saturation switches in a pair of zeners configured as clipping diodes. 2 different pairs to choose from.
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Re: Van Halen Tribute Amp

Post by Bieworm »

crgfrench wrote:
Wed 11/18/20 8:32 pm
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?
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Re: Van Halen Tribute Amp

Post by crgfrench »

Bieworm wrote:
Thu 11/19/20 12:22 am
Are the zeners still to be determined ?
a pair of 1N4739s and a pair of 1N4747s
Bieworm wrote:
Thu 11/19/20 12:22 am
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".
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Re: Van Halen Tribute Amp

Post by Riffmonster »

Thanks for clarifying, makes sense!
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