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My RED type A mic is shorting the power supply
Old 12th February 2018
  #1
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My RED type A mic is shorting the power supply

I just went to fire up my RED Audio Type A tube mic and when I plug the 7 pin cable into the mic body the light on the power supply goes out as if it is shorting and there is no signal. I checked the cable and the pins and wires are okay. I don't know if the small cap in the cable could be bad and cause this. Could a bad tube be the culprit? I can't find a schematic and I'm reluctant to open it it
Old 12th February 2018
  #2
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jwh1192's Avatar
Quote:
Originally Posted by TheVillageIdiot View Post
I just went to fire up my RED Audio Type A tube mic and when I plug the 7 pin cable into the mic body the light on the power supply goes out as if it is shorting and there is no signal. I checked the cable and the pins and wires are okay. I don't know if the small cap in the cable could be bad and cause this. Could a bad tube be the culprit? I can't find a schematic and I'm reluctant to open it it
are you Plugging in your TUBE mic with the POwer Supply already Powered Up ???
Old 12th February 2018
  #3
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Powered & Non Powered up

It does not work either way. As soon as I plug the mic end of the cable into the mic body it shunts the power supply. There is a small ceramic capacitor inside the connector at that end that I might replace first before opening the mic body up. I wondered if a bad tube could cause this as well? it is a dual-triode tube. The output circuit is transformerless; it uses 3 transistors (presumably one phase-splitter and two bipolars) to produce balanced output. I hate to send it across the country to have it fixed if it's a simple fix.
Old 12th February 2018
  #4
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jwh1192's Avatar
Quote:
Originally Posted by TheVillageIdiot View Post
It does not work either way. As soon as I plug the mic end of the cable into the mic body it shunts the power supply. There is a small ceramic capacitor inside the connector at that end that I might replace first before opening the mic body up. I wondered if a bad tube could cause this as well? it is a dual-triode tube. The output circuit is transformerless; it uses 3 transistors (presumably one phase-splitter and two bipolars) to produce balanced output. I hate to send it across the country to have it fixed if it's a simple fix.
ok, understood, i was just mentioning that it is not the best thing to plug in a TUBE mic wehn the power supply is already powered up ..

wondering if this caused the issue in the first place is my first thought ..
Old 14th October 2019
  #5
Gear Nut
 
Byron Pierce's Avatar
Quote:
Originally Posted by TheVillageIdiot View Post
It does not work either way. As soon as I plug the mic end of the cable into the mic body it shunts the power supply. There is a small ceramic capacitor inside the connector at that end that I might replace first before opening the mic body up. I wondered if a bad tube could cause this as well? it is a dual-triode tube. The output circuit is transformerless; it uses 3 transistors (presumably one phase-splitter and two bipolars) to produce balanced output. I hate to send it across the country to have it fixed if it's a simple fix.
Hello Village Idiot
Wondering if you were able to fix your issue?

I own RED MIC TYPE A and my power supply just went out completely. I can't find schematic. Obviously since its a slow start one of those capacitors maybe bad but i don't know where to look
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