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Re: Replacement diodes [message #23141 is a reply to message #23130]

Thu, 18 June 2015 17:55

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

The Frankie power amps are completely different from the later series amps. They are very similar to the power amps in the Vox Beatle amps.

The two 8R2 ohm resistors set the bias of the output transistors. One is 25% high and the other is 50% high, replace them and I will guess that the overheating will stop.

Steve is right, the output offset voltage is controlled by the matching of the output transistors. If you have the time to swap them in and out, you might be able to get it down to less than 1/2 volt dc. If your meter has a gain test setting you might be able to try and match 4 outputs to make it easier.

Of the six transistors one is the 24 volt regulator another is the driver transistor and there are 4 in the output section, two for each half of the signal. You only need to match the 4 outputs.

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[Message index]

		Replacement diodes By: bluezebra on Thu, 18 June 2015 00:22
		Re: Replacement diodes By: chicagobill on Thu, 18 June 2015 02:12
		Re: Replacement diodes By: bluezebra on Thu, 18 June 2015 02:26
		Re: Replacement diodes By: stevem on Thu, 18 June 2015 06:09
		Re: Replacement diodes By: bluezebra on Thu, 18 June 2015 10:46
		Re: Replacement diodes By: stevem on Thu, 18 June 2015 11:28
		Re: Replacement diodes By: bluezebra on Thu, 18 June 2015 11:42
		Re: Replacement diodes By: stevem on Thu, 18 June 2015 13:09
		Re: Replacement diodes By: bluezebra on Thu, 18 June 2015 13:13
		Re: Replacement diodes By: stevem on Thu, 18 June 2015 13:23
		Re: Replacement diodes By: chicagobill on Thu, 18 June 2015 17:55
		Re: Replacement diodes By: stevem on Thu, 18 June 2015 19:37
		Re: Replacement diodes By: bluezebra on Thu, 18 June 2015 22:21
		Re: Replacement diodes By: chicagobill on Fri, 19 June 2015 01:22
		Re: Replacement diodes By: stevem on Fri, 19 June 2015 06:33
		Re: Replacement diodes By: pleat on Fri, 19 June 2015 07:06
		Re: Replacement diodes By: bluezebra on Fri, 19 June 2015 09:52
		Re: Replacement diodes By: chicagobill on Fri, 19 June 2015 12:54
		Re: Replacement diodes By: stevem on Fri, 19 June 2015 18:43
		Re: Replacement diodes By: bluezebra on Fri, 19 June 2015 20:28
		Re: Replacement diodes By: chicagobill on Fri, 19 June 2015 20:41
		Re: Replacement diodes By: bluezebra on Fri, 19 June 2015 21:11
		Re: Replacement diodes By: chicagobill on Fri, 19 June 2015 22:11
		Re: Replacement diodes By: bluezebra on Fri, 19 June 2015 22:19
		Re: Replacement diodes By: chicagobill on Sat, 20 June 2015 02:29
		Re: Replacement diodes By: stevem on Sat, 20 June 2015 06:11
		Re: Replacement diodes By: chicagobill on Sat, 20 June 2015 11:08
		Re: Replacement diodes By: stevem on Sat, 20 June 2015 15:32
		Re: Replacement diodes By: bluezebra on Sat, 20 June 2015 21:03

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