Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: dogburn on June 17, 2023, 11:14:54 am
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Hi all - this is my first topic posting here after lurking here for some time (and getting a lot of good info). I'm not an expert at tube amp design/building, but I have built a 6G2 Princeton and AA764 Champ (both with various mods), and know enough not to get myself zapped.
For one of my next projects, I'm aiming to build a Lamington Reverb and incorporate various mods, including ones I've seen posted here. There was no easily available layout file for the Lamington Reverb, so I made one with DIYLC, which I'm posting below. It's the first time I've created a layout from scratch based on a schematic, so I'd appreciate it if people could look it over and debug it as needed. (And when I say created from scratch, basically I took one of Rob Robinette's DIYLC files and used it as a template.)
I'm also posting a couple of the files from the forum including the modified schematic and added filter scheme.
Mods/deviations from original Lamington Reverb include:
Using a toroidal transformer with 240V and 6.3V secondaries
Parallel Heater wiring, plus artificial center tap for 6.3V
Added filter stage
Added Grid stopper for input
Jack for footswitch
Pot for adjusting dry level
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Your deviation from the lamington reverb also includes not mixing on the input, which is a step forward in my opinion. But the proof is in the reverbing.
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When I get around to building it, I will let people know how the reverbing goes. Hopefully in the next month or two.
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Did you ever build this? I have a lamington reverb and curious about tweeks and mods.
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I did build it, and it was working. It had too much hum and I wasn't very impressed by the reverb sound itself, so I didn't spend the time to eliminate the hum and I'm repurposing the parts.