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Blown Neveish BA283 Style Amp
Old 1 week ago
Gear Addict

Blown Neveish BA283 Style Amp

Hi Folks,

I was using two BA283 type amps for makeup gain for a stereo Pultec. While troubleshooting noise, I think I shorted something out and I'm pretty sure I blew up the amps and fried the output transformers. I want to re-build the amps, but and replace any part that could have been damaged.

Today I tested the amps by themselves, and the output was low and distorted. I used a pot for gain adjustment (the 2k RV2 on the attached schematic), and this no longer affects the output.

Any help would be appreciated.

Attached Thumbnails
Blown Neveish BA283 Style Amp-mkup_sch.jpg  
Old 1 week ago
I doubt you fried the output transformers. FWIW
Old 1 week ago
Gear Addict


The transformers no longer pass a clean signal.
Old 1 week ago
Originally Posted by craigmorris74 View Post
The transformers no longer pass a clean signal.
In circuit or out of circuit? Something before them could be distorting. Transformers are pretty goof proof unless you overload them with a large DC voltage that they are not designed to handle. Even then transformers are passive devices and are normally pretty immune to problems. IMHO, I would look elsewhere first. FWIW
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