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Blown Neveish BA283 Style Amp
Old 1 week ago
  #1
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.

Craig
Attached Thumbnails
Blown Neveish BA283 Style Amp-mkup_sch.jpg  
Old 1 week ago
  #2
I doubt you fried the output transformers. FWIW
Old 1 week ago
  #3
Gear Addict
 

STudy

The transformers no longer pass a clean signal.
Old 1 week ago
  #4
Quote:
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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