I completed a full recap on the Grundig 8058. 33 capacitors in all
Almost all capacitors measured about 50% over spec on my capacitance meter
German radios are assembled without consideration to future service, so I had to disassemble parts in order to get to some caps, but not too bad
Most of the caps I change get pigtails which makes it much easier to correctly place the new cap.
I just brought the two 100uf filter caps underneath (zip-tied caps in image)
I fired it up and got a shrill tone, very bad
Obviously something I did since it worked before
So I then went back to my cap list and meticulously compared each changed cap's wiring against the schematic, validating the change
At first I was suspicious of the filter caps because I had to run a ground bus and tie three caps to it and it required the most change, but nope, not it
The C90 .01uf cap that came off of pin #1 of the output tube (EL95) was soldered to the pin NEXT to the correct pin, again, very bad on my part. The schematic review worked.
I remember that I cut this cap out only to discover that I did not have this particular cap on hand so I had to leave the patient on the operating table for 3 days until I could get the new cap. Another mistake on my part
Fixed it.
I fire it up again and NO shrill sound, the unit comes up and starts receiving stations
BUT IT SOUNDS JUST LIKE IT DID IN THE BEGINNING, MUDDLED TONE
Now I am going to pull the receiver and meticulously check EVERY resistor
I also found another very well hidden .0068 500v cap in the tone circuit as well as a 20uf 50v Non Polarized cap on the speaker wiring