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Re: Futterman H3 Blowing Fuse

Posted by vacumtubes (A) on September 27, 2006 at 22:44:48

In Reply to: Re: Futterman H3 Blowing Fuse posted by AJ on September 26, 2006 at 21:46:02:

Thanks for your posts.
I do have the original bias procedure for the H-3 already.

Hopefully the 6HJ5 is all that is wrong with the amp. The diodes are good, and the caps are not open or shorted, did not test capacity. I need to call a store that listed 6HJ5 (various brands) to find out it they are what they claim. At least they are only asking $6.00 each. The 6FW5 is really close, and should work with a socket change.

And thanks AJ, I do know the primary is not fused, and transformers are known to blow on these. I've been bring it up on a variac and checking voltages as I go along.
Ive been blowing the 1.5A fuse after the bridge.

The coupling capacitors in mine are Mallory so they may have been changed. I should replace them anyway, along with the electrolytics.

I will try my stacked 57 in series, and with the Zero's that I have.

Thanks again and any more feedback is appreciated.

vacumtubes

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