Van Halen Tribute Amp

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crgfrench
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Re: Van Halen Tribute Amp

Post by crgfrench »

Here is the "close to final" layout:
Screen Shot 2020-11-30 at 12.22.03 PM.png
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Re: Van Halen Tribute Amp

Post by crgfrench »

3 changes at this point:
1) Mounted PT laydown style rather than standup to save some space in the Tweed Deluxe cabinet (even though the cab will be 1" deeper than standard)
2) 50k mid pot rather than 25k (boost mids, same as EVH Marshall)
3) might add a 3-way "Plume" switch to choose the Lava tap 4/8/16R
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Re: Van Halen Tribute Amp

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Most of the parts are here
20201202_135218.jpg
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Re: Van Halen Tribute Amp

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crgfrench wrote: ↑
Wed 12/02/20 2:23 pm
Most of the parts are here20201202_135218.jpg
Shake it!!! How does it sound?
πŸ˜€πŸ˜€πŸ˜€
No seriously.. looking forward to your new build Craig!
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"THIS should be played at high volume..preferably in a residential area"

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Re: Van Halen Tribute Amp

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Just a bunch of rattley noise so far!
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Re: Van Halen Tribute Amp

Post by crgfrench »

JMPGuitars wrote: ↑
Sat 11/14/20 1:12 pm
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.
I think he means Ed biased the 6CA7s in his main Marshall to 50mA when he had the variac dialed to 89-90VAC.
Dave discusses this at 7:50 in Pete Thorn's EVH Deep Dive video https://www.youtube.com/watch?v=aKejQ1WBybA
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Re: Van Halen Tribute Amp

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Some of the Volcano parts laid out, waiting patiently while I paint 6 coats on the chassis.
Screen Shot 2020-12-13 at 11.16.34 PM.png
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Re: Van Halen Tribute Amp

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Updated Layout, very close to final
Screen Shot 2020-12-13 at 11.43.27 PM.png
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Re: Van Halen Tribute Amp

Post by Bieworm »

what type of pots do you use for volume and magma?

Craig, I just love your OCD man!!! You should livestream your build...
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Re: Van Halen Tribute Amp

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All of the switched pots are 1M audio taper, I'm using these:
https://tubedepot.com/products/alpha-16 ... g-pc-mount
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Re: Van Halen Tribute Amp

Post by crgfrench »

Chassis paint fail. Originally my plan was to paint the chassis like the frankenstrat, same process Eddie used: paint it black, tape first pattern, paint it white, untape, tape second pattern, paint it red, untape, frankenchassis. I mocked up the first tape pattern over the cling film.
20201212_043510.jpg
After removing the film, I saw that my Hoffman Stout chassis was produced with some kind of petroleum residue on the aluminum, underneath the protective plastic cling film. I wiped it down with isopropyl alcohol which didn't seem to do much. I thought about going at it with a scotchbrite pad and acetone, which is the way I used to clean aluminum when I was TIG welding 35 years ago. "Nah," I thought, "It's clean enough, I'll just hit it with the Krylon."

Two layers of Krylon gloss black 2X ultracover paint+primer later... Disaster! Whatever that residue was, it ruined the paint job.
20201217_133930.jpg
OK, strip it down with a can of Jasco paint remover, then scotchbrite & acetone.
20201217_165344.jpg
Forget the paint.
20201217_180443.jpg


Nobody's going to see the chassis anyway, inside the 1x12 combo with the tubes pointing forward horizontally.

The Hoffman stout chassis does not have welded corners, so I'm out shopping for a little AC/DC TIG machine...
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Last edited by crgfrench on Sun 12/20/20 11:33 am, edited 1 time in total.
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Re: Van Halen Tribute Amp

Post by crgfrench »

Here's my "Volcano" drilling template for the Hoffman Stout Chassis.
The layout (everything except what's in green) is cobbled together from Doug's site https://el34world.com/ . My mods are annotated in green.

Stout_Volcano Drill Mods.png

Hole "G" is unnecessary if you mount the PT standup style, but I'm mounting it laydown style to save a little space ( about 1") in the cabinet. You'll notice my drill bit wandered about 1mm for this hole, I drilled everything by hand. I used a center punch but I went from a 1/8" bit right to a 1/2" bit and the latter just went off center a little. Oh well, it ain't rocket surgery...
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Re: Van Halen Tribute Amp

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OK the chassis is at 1978 specs now. It's a little rough (mainly just the 3rd diagonal on the upper horn) but what the hell, the frankenstrat was rough. Red coming next to bring it up to '79...
1978frontside.png
1978rearside.png
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geoff 1965
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Re: Van Halen Tribute Amp

Post by geoff 1965 »

Craig when painting bare aluminium you need to use a coat of self etching primer first for best results,over time just paint tends to flake.
EF515F34-3144-4E25-962F-4732CF314307.jpeg
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Re: Van Halen Tribute Amp

Post by crgfrench »

Thanks! I used 2 coats of gloss black Rust-oleum "2X ultracover paint+primer". Then 2 coats of the same, in gloss white. Next up, 2 coats of Sunrise Red Rust-oleum Gloss Protective Enamel. I think the first primer coats will be OK, as I basically hand-etched the chassis with a scotchbrite pad and acetone right before applying the first coat. Put it this way: there was no oxide layer on this chassis when the first primer layer went on. Fingers crossed...
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