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Help! Groove Tubes 6TM Power Supply cable Pin out schematic/ ADAT Elco to 1/4" snaKes

Profile picture for user Jack Dupp
Submitted by Jack Dupp on

I have an old Groove Tubes 6TM mic with the PS1 Vacuum tube power supply. The mic end looks like the Groove Tubes EC7 cable in that it has a 7-pin connector. The power supply end looks like an 9-pin ADAT sync connector almost like a vga computer display connector. I am in need of the pin out configuration so that I can build one or a source to purchase one. Also does anyone have any ADAT 56-pin Elco to 1/4" snakes. I am in need of at least 2 and as many as 4. No luck from ebay or the usual suspects.

Thank you

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Profile picture for user aamicrophones
aamicrophones

Hi Jack, I don't have the pin outs but I have listed the two most common pin-outs below.



A good part of our business is upgrading Chinese microphones.



However, I have never done an 6TM.



But I could sell you one of our power supplies and dual 7 pin cables for $75. You might have to change the pin-outs at the microphone end.





If you send me a picture of the microphone circuit/connector with the sleeve off and the connector on your existing power supply I might be able to see how they have wired it.



We use the more common pin-outs listed below but Groove Tube could have used a different pin-out configuration.



1-+125v

2-5.5v dc filament

3-0-125v pattern selector

4-ground/common

5- audio out -

6-audio out+

7 ground/common connect to pin 4







My guess is that is much like a MA200 but with 3 patterns we use the same tube and a similar power supply in our CM28 tube pencil microphone but with our 7 pin configuration.



I just did another CAD8000 and they used a 6 pin which is what I believe Groove Tube changed to after the 6TM because folks didn't like that 9-pin connector.



Seven Pins are the maximum that you need and you can use 6 pins when you are not changing patterns from the power supply.



The spec's state that it had a capsule with 5 micron diaphragms. So, you might be in luck that it not to "zingy".





If the shield goes to pins 4 & 7 then its probably wired liked above.



The wiring for the 6 pin cables that we have come across is as follows:-



1-Ground/Common

2-Audio Out -

3-Audio Out+

4-5.5v dc filament

5-n/c

6-125v dc plate supply/capsule polarization



Cheers, Dave Thomas

[[url=http://[/URL]="http://www.aamicrop…"]Advanced Audio Microphones[/]="http://www.aamicrop…"]Advanced Audio Microphones[/]

Sat, 08/27/2011 - 19:03 Permalink