[Jukebox-list] Re: Seeburg HFMA1 amplifier Crackles

On 5/18/2026 4:51 PM, M De Simone via Jukebox-list wrote:

Tony, Thanks for the advice. The 5U4 was swapped and further tested in another V amplifier and all was good. I did change the filter capacitors after this happened but made no difference.

This could be a great example of why we never plug in an amp with the old filter caps, or with any old caps unless you are familiar with trouble shooting and know how to test stages as you go.

The old filter caps very well *could* have fried a transformer.