UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

jubilado · 5th Jul 2019, 10:54 pm

Thanks again for the replies.
I replaced the 2 4000uF capacitors and the 3000uF capacitor as they showed signs of leaking. When I said I had checked the capacitors I meant that I had checked that I had the polarity of these correct.
I had one of these amps (the 621 version rather than 626 which this is) in the 1970's and could run it at full volume without this strange behaviour.
I've only checked the aux input and the tuner input and the result is exactly the same with both.
There are a couple of smaller electrolytic caps on the Z20 board. - should I be looking at changing these?

5th Jul 2019, 10:54 pm	#25
jubilado Triode Join Date: Jun 2019 Location: Edinburgh, Scotland, UK. Posts: 30	Re: Armstrong 626 problem at high volume. Thanks again for the replies. I replaced the 2 4000uF capacitors and the 3000uF capacitor as they showed signs of leaking. When I said I had checked the capacitors I meant that I had checked that I had the polarity of these correct. I had one of these amps (the 621 version rather than 626 which this is) in the 1970's and could run it at full volume without this strange behaviour. I've only checked the aux input and the tuner input and the result is exactly the same with both. There are a couple of smaller electrolytic caps on the Z20 board. - should I be looking at changing these?