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Author Topic: OTS 1st power up squeals  (Read 4198 times)
GuitarHack
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« on: May 19, 2011, 08:41:06 PM »
Powered up using the Variac to slowly turn up the voltage.
Nothing went poof!!
But, when Voltage gets into operating range,  I get a high squeal - seems to be connected to the PI tube.
Tried different tubes.
With or without tubes in V1 and V2, when a tube is in V3 it squeals.
With no tube in V3 (with or without tubes in V1 and V2) - no squeal.
When I cut power, squeal fades out (doesn't end abruptly)

Any ideas?
Thanks
Jon
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OTS 50
2004 PRS Single Cut Trem
Mollenhauer Strat
custom Paduk neck-through Strat
Mack Heatseeker 36
Peavey Classic 50
SoundPerf
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« Reply #1 on: May 19, 2011, 09:22:42 PM »
Sounds like the OT primaries are reversed. Try switching them around.
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Chris

Ceriatone HRM 50
w/self built Dumblelator
Avatar 2X12 w/WGS ET-65 & Veteran 30
TC Electronic 2290
2001 PRS McCarty
2010 PRS 513 Swamp Ash
Tacoma JK50C
Seagull S12+
GuitarHack
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« Reply #2 on: May 20, 2011, 04:00:09 AM »
Thanks a billion, Chris. That solved it.
I'm actually hearing a guitar now!
AWESOME!!!
So now I just have to set the PI and bias and burn 'er in.

Thanks again - you made me a very happy camper.
Jon
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OTS 50
2004 PRS Single Cut Trem
Mollenhauer Strat
custom Paduk neck-through Strat
Mack Heatseeker 36
Peavey Classic 50
SoundPerf
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Posts: 392



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« Reply #3 on: May 20, 2011, 07:18:15 PM »
You're totally welcome. Glad to hear it.

Enjoy your new amp!
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Chris

Ceriatone HRM 50
w/self built Dumblelator
Avatar 2X12 w/WGS ET-65 & Veteran 30
TC Electronic 2290
2001 PRS McCarty
2010 PRS 513 Swamp Ash
Tacoma JK50C
Seagull S12+
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