Washington Terrible hum/squeal on SSB TX

[liquidh8]

Ok, So I haven't been talking on my Washington (858pll) for some time since I got the Saturn and the HR2510. But, when i did, it would squeal/hum BAD on SSB, unless the mic gain was all the way down, so then there is no transmitted audio. Seems to do it on both USB and LSB. I never looked further into it, but I got a courier parts radio with the 858pll so i am gonna get back on it to fix it.

Anyone have any ideas?

 

[Wrench]

How old is the radio? It might be leaky or dried out capaciotors.

 

[liquidh8]

The radio has all new caps, new driver and final. I worked great for the longest time, then one time I shut it off, turned it on a week later and voila, a new problem, lol

 

[Robb]

Did the tantalum caps get exchanged for electrolytic caps too?
They should.

 

[liquidh8]

Yes sir, they have.

I haven't dug into it further just yet to fix it.

 

[Robb]

Try another mic on it.

 

[n0zna]

try backing down your

alc on the radio,if working on am it meens ssb alc is to high and will cause the problem.I run Siltronixs so i have had the same problem...73 de n0zna

 

[liquidh8]

I tried 5 different mics, not it. The radio is putting out about 9 watts SSB, and about 90% modulation. I was driving an amp so everything is turned down. Like I said, it worked fine for the longest time with all the current settings and microphone, then I turned it on one day and it is now acting up. So, something new is wrong with it. I'll be tearing into it in a few days to try and figure it out.