05-20-2026, 09:11 AM
A very interesting video, well done, although it covered mostly solid state equipment which is heavy on electrolytics. The picture of a cut up multiunit electrolytic can was certainly instructive. So is a pic of the innards of an old "wet" electrolytic. (They are no longer wet, and usually short when they go bad.)
When I recapped my dead Zenith 3000 TO, operation was restored. I don't own an ESR tester, and probably will buy one, but considering the green corrosion on the positive leads of all electrolytic caps in the set, and that the set was 62 years old, and there were about 10 caps in the set, the argument for wholesale recapping was strong.
On the other hand, my 8G005 TO is fully functional and every part in the set down to the tubes, caps, resistors, etc. are original!
I think for some of the more simple sets that we deal with, the argument for wholesale recapping is also strong based on age, high failure mode for power supply electrolytics and paper foil caps and (relative?) ease of replacing caps. Doing a TV or a mid 70s stereo receiver
I have 2 Yamaha mixers that are now about 25 years old. Each channel of a mixer has at least 3 stages, coupled by electrolytic caps, the tone (or EQ stage) has several caps, the power supply, etc. Multiply that by 16 (the amount of channels) add the 2 "group" busses, the main bus, The Control Room and Headphone amps, the Effects In and Out, and OMG, the amount of work needed to recap this!! Fortunately, I run the unit on batteries instead of AC. (The power supply for this unit is a 36V CT transformer, feeding a bridge rectifier, so two 24V power tool batteries do the trick.)
Only issue is the "phantom" supply, but most all inputs to this board are wireless mic receivers. The rest are dynamic mics as this rig is used outdoors, and previous experience with our small diaphragm choir mics resulted in a lot of wind noise and a $450 mic got totaled when one of the Church maintenance guys closed a truck door on it. The director and I are the sole people who transport this equipment now (especially as I own most of it).
When I recapped my dead Zenith 3000 TO, operation was restored. I don't own an ESR tester, and probably will buy one, but considering the green corrosion on the positive leads of all electrolytic caps in the set, and that the set was 62 years old, and there were about 10 caps in the set, the argument for wholesale recapping was strong.
On the other hand, my 8G005 TO is fully functional and every part in the set down to the tubes, caps, resistors, etc. are original!
I think for some of the more simple sets that we deal with, the argument for wholesale recapping is also strong based on age, high failure mode for power supply electrolytics and paper foil caps and (relative?) ease of replacing caps. Doing a TV or a mid 70s stereo receiver
I have 2 Yamaha mixers that are now about 25 years old. Each channel of a mixer has at least 3 stages, coupled by electrolytic caps, the tone (or EQ stage) has several caps, the power supply, etc. Multiply that by 16 (the amount of channels) add the 2 "group" busses, the main bus, The Control Room and Headphone amps, the Effects In and Out, and OMG, the amount of work needed to recap this!! Fortunately, I run the unit on batteries instead of AC. (The power supply for this unit is a 36V CT transformer, feeding a bridge rectifier, so two 24V power tool batteries do the trick.)
Only issue is the "phantom" supply, but most all inputs to this board are wireless mic receivers. The rest are dynamic mics as this rig is used outdoors, and previous experience with our small diaphragm choir mics resulted in a lot of wind noise and a $450 mic got totaled when one of the Church maintenance guys closed a truck door on it. The director and I are the sole people who transport this equipment now (especially as I own most of it).
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
"Let us begin to do good"- St. Francis
Best Regards,
MrFixr55
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