EICO HF-89 restoration

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

I have an EICO HF-89 in non-functional condition. Mice got to it while in storage and chewed up the power capacitors. Also the varistor slow-start thing doesn't work (the last time I tried to power up the amp, it just smoked and never kicked on). A few of the original passive components failed and were replaced with cheap crap long ago when I was a college student. Otherwise it's all there.

Does anyone know a restoration guide? I have the manual with original build instructions, but I wouldn't know how to find good parts. Plus I understand there are problems with the original design, such as running the output tubes too hard (they used to go into thermal runaway at random moments. although maybe it was just a bad brand of tubes). I wonder if someone has worked up a circuit using the same transformers but otherwise modernized, complete with parts list.

Thanks,
Mike

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Topic - EICO HF-89 restoration - mike1127 15:20:07 08/28/10 (8)

RE: EICO HF-89 restoration - Jim Doyle 18:41:06 08/29/10 (2)

RE: EICO HF-89 restoration - Ray Moth 15:26:31 09/01/10 (0)

RE: EICO HF-89 restoration - Michael Samra 09:22:20 08/30/10 (0)

RE: EICO HF-89 restoration - Jim McShane 18:13:41 08/29/10 (1)

RE: EICO HF-89 restoration - gbeard 19:34:08 09/08/10 (0)

RE: EICO HF-89 restoration - Michael Samra 16:55:30 08/28/10 (1)

RE: EICO HF-89 restoration - mike1127 18:33:03 08/28/10 (0)

RE: EICO HF-89 restoration - kyle 15:33:12 08/28/10 (0)

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