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Frankenstein Head: replacement cap values [message #24244]

Tue, 22 December 2015 13:33

IdahoPicker
Messages: 7
Registered: October 2015
Location: North Idaho

Junior Member

Hi all,
I posted a while back about a Frankenstein head, the help I received was fantastic! I have another Frank head on the bench (same customer). Here's what's up: It was distorting at all volumes (sounded like bad speaker). I replaced the 500uf cap on the Driver Regulator. It cleaned things up quite a bit. I've tested every transistor in the pre-amps and the driver regulator, every electrolytic cap as well. Everything is measuring within range. The only cap that looked questionable is a 90uf electrolytic in the driver regulator. All I have on hand are 100uf caps. Is this a safe replacement for 90uf in these amps?

The amp sounds decent, but it strikes me as a little underpowered, and it begins to distort a little bit with volume at 3 o'clock (both channels)

I have an image of the scope display, but I'm having trouble getting images on here. The waveform looks good on the top half, but the bottom shows a deviation. The deviation increases with volume.

I'm (obviously) pretty new to these amps, and I appreciate your advice!
Thanks!

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[Message index]

		Frankenstein Head: replacement cap values By: IdahoPicker on Tue, 22 December 2015 13:33
		Re: Frankenstein Head: replacement cap values By: IdahoPicker on Tue, 22 December 2015 13:46
		Re: Frankenstein Head: replacement cap values By: chicagobill on Tue, 22 December 2015 15:38
		Re: Frankenstein Head: replacement cap values By: IdahoPicker on Tue, 22 December 2015 15:58
		Re: Frankenstein Head: replacement cap values By: stevem on Wed, 23 December 2015 06:33
		Re: Frankenstein Head: replacement cap values By: IdahoPicker on Mon, 28 December 2015 17:36
		Re: Frankenstein Head: replacement cap values By: chicagobill on Tue, 29 December 2015 00:18
		Re: Frankenstein Head: replacement cap values By: IdahoPicker on Thu, 31 December 2015 14:00

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