abechap024

Groovetube GT66 / Sterling Audio ST66 Schematic
« on: March 04, 2013, 04:47:18 PM »
Hello,
I heard these are really the same mic. I got a sterling audio broken without a power supply, its a fet hybrid with small tube like royer mod. Anyone have the schematic or power supply info floating around? It would be a huge help!
Thanks,
Abe
AC Sound - some DIY circuitboards


gato

Re: Groovetube GT66 / Sterling Audio ST66 Schematic
« Reply #1 on: March 04, 2013, 07:51:41 PM »
I know Michael Joly mods them so he likely has the schematic.

mishagolin

Re: Groovetube GT66 / Sterling Audio ST66 Schematic
« Reply #2 on: March 06, 2013, 03:58:15 PM »
I have a GT66 and would be interested in any mod options. I see that Joly puts a new capsule in it.

HellfireStudios

Re: Groovetube GT66 / Sterling Audio ST66 Schematic
« Reply #3 on: March 07, 2013, 12:54:12 AM »
Joly puts a new capsule in everything.
"Tommorrow is just yesterday in reverse. Just like friends are enemies in reverse." -Gary Busey

abechap024

Re: Groovetube GT66 / Sterling Audio ST66 Schematic
« Reply #4 on: March 07, 2013, 01:52:21 AM »
I still haven't found the schemo :(

Well I got the mic because I thought It might be a good mic to test an M7 style capsule in, It came without power supply, but I figured it was basically a Royer type circuit. I was wrong. It uses a +48v rail along with 100ishV and heaters....

I can't really see the advantages of a Fet and a tube...its almost like they are adding the tube only as a gimmik to add "color" but I think a tube can stand perfectly well on its own. The Pad and HPF are probably advantages of having a fet, but cathode bypass tubes can't really distort...and hpf at the pre?

Anyway the only thing stopping me from gutting the whole mic is possible resale value, because I didn't really want the mic to begin with.

I've heard they sound fine, the output transformer "looks" ok, better then a lot of the other ones I've seen, hopefully its a good one.

For mods I would switch out the capsule, maybe upgrade the electrolytic caps....not really a mic that invites modding to me for whatever reason.

anyone have power supply pinouts at least? :)
AC Sound - some DIY circuitboards


 

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