[Amps] SB-220 tick,tick,tick

[gudguyham at aol.com]

One or more bleeders is open or a cold joint on the rectifier board.

Sent from AOL Mobile Mail
Get the new AOL app: mail.mobile.aol.com
 On Sunday, January 20, 2019, Steve London <n2icarrl at gmail.com> wrote:

I have an SB-220, of unknown lineage.

While using it, I noticed that on receive, listening on my receiver, I was 
hearing a strong tick, tick, tick sound, about 3 ticks per second. With a little 
experimentation, I noticed the tick rate was higher in the SSB position than the 
CW position. At audio frequencies, I localized the source to the HV area of the 
amp. My guess would be filter capacitors, rectifiers or equalizing resistors. A 
few more data points - the equalizing resistors are not the original - they are 
100K, rather than the original 30K. The electrolytics are Nichicon 200uF, 450 
WV, 85 degree C. That's probably not original, either. I don't see any cracked 
resistors. Best course of action ? Replace the electrolytics ?

73,
Steve, N2IC
_______________________________________________
Amps mailing list
Amps at contesting.com
http://lists.contesting.com/mailman/listinfo/amps