Wtd: Schematic for Groove Tubes 1B Mic
« on: July 08, 2012, 09:47:16 PM »
I have one of these mics and someone removed the tube. I need the schematic to replace it. Does anyone have a copy?

...Thanks!


pucho812

Re: Wtd: Schematic for Groove Tubes 1B Mic
« Reply #1 on: July 08, 2012, 10:12:32 PM »
try asking Aspen Pitma(sp), he founded GT and is a nice guy. I am sure he still has all that stuff.

[email protected]


or ask the current groove tubes owner

[email protected]

You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.

okgb

Re: Wtd: Schematic for Groove Tubes 1B Mic
« Reply #2 on: July 08, 2012, 11:40:47 PM »
or just try a 12ax7  or 12at7  or 12au7
GKB Audio / Greg Boboski

Re: Wtd: Schematic for Groove Tubes 1B Mic
« Reply #3 on: July 09, 2012, 12:53:31 AM »
try asking Aspen Pitma(sp), he founded GT and is a nice guy. I am sure he still has all that stuff.

[email protected]


or ask the current groove tubes owner

[email protected]


I tried contacting "Aspen Associates" via email and by phone weeks ago. No answer.

I also tried calling Fender. They had no idea what I was talking about - the guy on the phone was trying to Google the mic while I was talking to him ...he had never heard of it!

Re: Wtd: Schematic for Groove Tubes 1B Mic
« Reply #4 on: July 09, 2012, 12:57:14 AM »
or just try a 12ax7  or 12at7  or 12au7

The tube is a 6205 and was hard-wired in. All the wires have been cut and the tube is gone.

gyraf

Re: Wtd: Schematic for Groove Tubes 1B Mic
« Reply #5 on: July 09, 2012, 01:45:44 AM »
Replace with another 6205 then?

Grid to capsule, heaters to heater supply, anode to whatever resistor that goes in the HT direction, cathode to whatever goes low-to-medium resistance towards ground, extra grids (if pentode) to anode or cathode?

Jakob E.
..note to self: don't let Harman run your company..

okgb

Re: Wtd: Schematic for Groove Tubes 1B Mic
« Reply #6 on: July 09, 2012, 08:22:03 AM »
Sorry , you could have added that info , but as gyraf says , knowing the tube
shouldn't be too hard to trace the typical connections , maybe a chance to rebuild it better
GKB Audio / Greg Boboski

Re: Wtd: Schematic for Groove Tubes 1B Mic
« Reply #7 on: July 09, 2012, 01:40:32 PM »
Thanks for the replies...

Unfortunately it's not that obvious what goes where on the tube connections. Reverse engineering the circuit is complicated by the use of an FET front end. If someone knows of a similar circuit online using something like a 6205 tube and 2SK117 FET, that would be very helpful.

Blue Jinn

Re: Wtd: Schematic for Groove Tubes 1B Mic
« Reply #8 on: July 09, 2012, 05:53:58 PM »
Can you post some pictures? Do the connections not follow the pinout of hte tube? 
not my thing. I am here just to unbalance the equation --pucho812

 http://www.bluejinn.org

pucho812

Re: Wtd: Schematic for Groove Tubes 1B Mic
« Reply #9 on: July 09, 2012, 08:08:53 PM »
6205 is a subminiature tube. Has legs/leads so I could see where there is confusion.
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.


 

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