Bottlehead Kits > S.E.X. Kit

S.E.X. upgrade C4S problem [resolved]

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sprout:
My S.E.X. amp sounded great on headphones before the upgrade installation, but only after a right channel failure that was resolved with a better solder joint at a loose spot. However, after the upgrade, I get 90 v at OB, but get only 1 v at OA. Again a right channel issue, so I don't know if this is an original problem back again, or if it's an upgrade problem. Advice please! Thanks, Jim

Paul Birkeland:
I would post build photos.  1V at the output of a C4S would have me looking for metal bits touching each other that shouldn't be (don't forget that the chassis plate counts).

sprout:
Again, after some solder joint work, I got a correct reading, hooked it up, and it sounded great. Then after half hour of Doobie Brothers, the right channel dropped out. Now I'm getting 1 v at OA again.

So, both before and after the upgrade, I had the right channel drop out. I plan to keep re-soldering each joint on the right channel.

I'll try photos, but it didn't work last effort. It looks like a monkey made it.

Thanks and very sorry to be a pest. Jim

Paul Birkeland:
R1 on the A side isn't well soldered, could I see photos of the bottom and top of the PC board?

sprout:
Thanks, I'll re-solder that one. Here are photos of the board, and it is so small, maybe there's contact somewhere.

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