Sounds like a great excuse to ditch it and buy something that sounds better. Get yourself a modestly priced tube pre and start living.
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Something is broken. It is worth fixing. Since it is worth $600 to $700 dollars, fixing should cost less than $300.
I used an Adcom GFP 750 for many years no problems.
As for Roxy54 post, jealousy over a product makes poor insults. Because you want to screw around with tubes does not mean we all do.
If it has a smell, I would NOT continue to use it in passive... something inside is burning anyway.
Not everyone here may be aware that the GFP-750 is a Nelson Pass design. From Stereophile's review, written by Wes Phillips:
The GFP-750 is a Nelson Pass designessentially a variation on the Pass Labs Aleph P and Pass's DIY project .... The preamplifier that most reminded me of the GFP-750 was the Mark Levinson No.380S, which costs $6495.... I've gone just gaga over it, not simply because it performs well for the money, but because it begs comparison with the best preamplifiers I've ever heard. Period.Also, I strongly second Elizabeth's recommendation that the unit not be operated in passive mode until the problem with active mode is resolved. Given that it is producing a smell, continuing to operate it could very conceivably lead to further secondary damage, or even a fire hazard.