And Another 5-Stage "Bay Area Thrash" Langner Mod

  • Thread starter Thread starter FourT6and2
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FourT6and2

FourT6and2

Well-known member
Got another vintage Marshall on the bench for a 5-stage "Bay Area Thrash" mod. A pretty clean 1972 Super Lead. Surgery has begun!

Next step is to punch a new hole for the additional tube and figure out how I want to mount all the new components.

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More progress getting parts ready to solder. Just waiting on knockout punch to arrive before going further.

Someone asked how I get bypass caps level/vertical. I just let gravity do all the work. Hang them upside down, tack-solder one side so it doesn't move, then solder the other side, and then go back to the first joint to sew it up right.

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that looks pretty cool. Will it have a depth mod? I find Marshalls to be too thin without them.
 
FourT6and2 said:
More progress getting parts ready to solder. Just waiting on knockout punch to arrive before going further.

Someone asked how I get bypass caps level/vertical. I just let gravity do all the work. Hang them upside down, tack-solder one side so it doesn't move, then solder the other side, and then go back to the first joint to sew it up right.

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TBH I'm more impressed with the perfect/parallel fit of the board itself. Now you're just showing off. 🤣
 
SpiderWars said:
TBH I'm more impressed with the perfect/parallel fit of the board itself. Now you're just showing off. 🤣
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Thank you haha!

I actually spent a few hours getting that freakin' turret board installed and lined up straight. When you lay the board down on the flat chassis surface and mark the holes to drill for the standoffs, it's one thing. But as soon as you install the standoffs and lift the board in the air, it no longer lines up. The brass screws and standoffs and nuts and lock washers and crooked surface of the chassis itself throw the entire thing off. I had to literally account for the natural misalignment of all those parts to get the board itself to sit straight.

It was actually one of the most frustrating things I've done in a while.

Oh, I also cut that turret board by hand, with a hacksaw. Just clamped it to a table and went to town. Then I rubbed the edges on some sandpaper until it was flat/square, like a cheese grater.
 
FourT6and2 said:
Thank you haha!

I actually spent a few hours getting that freakin' turret board installed and lined up straight. When you lay the board down on the flat chassis surface and mark the holes to drill for the standoffs, it's one thing. But as soon as you install the standoffs and lift the board in the air, it no longer lines up. The brass screws and standoffs and nuts and lock washers and crooked surface of the chassis itself throw the entire thing off. I had to literally account for the natural misalignment of all those parts to get the board itself to sit straight.

It was actually one of the most frustrating things I've done in a while.

Oh, I also cut that turret board by hand, with a hacksaw. Just clamped it to a table and went to town. Then I rubbed the edges on some sandpaper until it was flat/square, like a cheese grater.
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Yep I recognize. Hecho a mano. :cheers:
 
Home stretch! Heaters and socket wiring done. Just need to get some shielded cable wired up for the input, install some custom options the owner requested, and test a couple voicing options I'm playing with.

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Man, have times changed. I remember back in the Metro Forum days how guys were so secretive about mods. It was like pulling teeth to get info out of people which made it tough when you’re starting out and trying to learn
 
LP Freak said:
Man, have times changed. I remember back in the Metro Forum days how guys were so secretive about mods. It was like pulling teeth to get info out of people which made it tough when you’re starting out and trying to learn
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I figure if you're good enough to reverse engineer a circuit from photos, have at it lol...

Plus, I didn't invent this mod. It's already all over the internet. But I did do a lot of work to figure out how to implement it properly and get it noise-free, no oscillations, etc. And re-voice it here and there for my own personal tastes.

These guys talk about one of the amps I worked on here. Seems they've been lurking the forums. Hi guys!

 
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