Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

 
 
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Default Revox B251 Integrated Amp No Output and More

Before I dive in blind, here are the symptoms:

This amp, which had worked nicely at our summer house (seasonal use) for 4 years died one evening - slowly going quiet over about 30 minutes (I was drowsing at the time and did not notice the problem until about the final 2 minutes). No heat, no smoke, no fan operation, no smell. I turned it off for an hour thinking a part may have overheated. When I turned it back on, it promptly blew the main PS fuse. This is a solid-state 100WPC amp built as with many things Revox like a tank. LCD display, capacitance controls, and so forth. It is also IR remote-capable.

I removed the unit from service and brought it home. Last night, after about a 18 months, I decided I would look it over. I replaced the fuse, and brought it up slowly on the variac. The first time, it drew about 45 watts, quiescent, no activity, no display, no pilot light. When I activated the on/off switch, the display went wonky - random pixels, random words, but no activity. No controls, including on/off responded after that point, but the draw went up to about 65 watts. I shut the unit down and held the on/off switch for 40 seconds (hey, it sometimes works with computers and other devices containing computers). This time, when I applied power and reached about 120V, the fan came on, the display showed other random stuff, but still no activity.

At this point, I decided that without direction, I would likely do more harm than good at random.

Thoughts? Suggestions? I am searching for the manual from HiFi engine, but I am also hoping that someone out there may have had some experience with these beasts.

Peter Wieck
Melrose Park, PA
 
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