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Magnatone Model MP-3 [message #27182]

Wed, 18 January 2006 15:59

Stratcat
Messages: 2
Registered: May 2009

Esquire

Hi--This is a mid sixties two twelve combo amp. Power tubes (2) are EL34s. The schematic for this amp shows 400v at terminal A of the power cap can, 340v at B, 220v at C, and 140v at D. I'm getting 502v at A,425v at B, 289v at C, and 284v at D. I can get only get the amp to bias correctly by greatly reducing the 22K bias resistor. The power transformer runs cool, but I'm wondering if it's shorted. Would it be okay to reduce the voltage using a zener diode in this case? Thanks for any info you can give. Stratcat

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[Message index]

		Magnatone Model MP-3 By: Stratcat on Wed, 18 January 2006 15:59
		Re: Magnatone Model MP-3 By: Thermionic on Thu, 19 January 2006 00:40
		Re: Magnatone Model MP-3 By: Stratcat on Thu, 19 January 2006 05:37
		Re: Magnatone Model MP-3 By: Thermionic on Fri, 20 January 2006 20:17

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