02-02-2026, 04:55 PM
I have used high capacity caps in several radios, mostly AA5s, but I worry now, especially when I saw flashing in a globe 80 in a Radiola 17, I figured, maybe a 100uF cap may be a bit much. I was trying to get rid of the hum to get the "room filling sound" that is indistinguishable from a live performance that RCA claimed that the Radiola was capable of. Hey, the solid state stuff uses caps of about 1000 uF or more in their power supplies, why can't I do that here? Of course, the hum comes from the 26s and 71A, even if adjusting the hum balance pots. OK, dummy (me), consult the RCA receiving Tube Manual, for maximum capacity allowed in cap input filters.
Back in the day, there was a rule to stay close to, but do not exceed, the working voltage rating of an electrolytic cap. The theory was that if you, for example, use a 50 uF 450WV cap in an AA5, the actual capacity would be significantly less than 50 uF because the electrolyte would not correctly "form"
Back in the day, there was a rule to stay close to, but do not exceed, the working voltage rating of an electrolytic cap. The theory was that if you, for example, use a 50 uF 450WV cap in an AA5, the actual capacity would be significantly less than 50 uF because the electrolyte would not correctly "form"
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
"Let us begin to do good"- St. Francis
Best Regards,
MrFixr55




