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Old 15th May 2011, 11:26 PM   #1
jkasch is offline jkasch  United States
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Default Jolida JD9 Problem

Hello,

My JD9 phono pre is doing some strange things and I'd appreciate any thoughts you may have.

It's about 5 years old and I'm running the Groove Tube Mullard reissues that I understand had reliability issues, but I got the the "Platinum Grade" from Upscale Audio and they've been great.

Anyway, recently when using the hi level outputs, I'll get loud clicks followed shortly after by a huge increase in volume and my HK 990 integrated's protection circuits kicking in.

This doesn't seem to happen with any other phono stage. Can a bad tube cause this or does it sound more like a cap or resistor? I really don't know a whole lot about this kind of thing. Thanks for any ideas.
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Old 16th May 2011, 12:03 AM   #2
DF96 is offline DF96  England
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My guess is a cap or resistor, possibly in or around the RIAA network. Failing valves usually reduce volume. Both channels or just one?
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Old 16th May 2011, 01:13 AM   #3
jkasch is offline jkasch  United States
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Seems to be both. I've only allowed it to happen twice because it can't be too good for the rest of my sysyem. I'd be able to replace a cap or resistor but have no idea how to identify the bad one.
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Old 16th May 2011, 12:43 PM   #4
DF96 is offline DF96  England
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Both channels is puzzling. Perhaps an intermittent ground connection?
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Old 16th May 2011, 11:00 PM   #5
jkasch is offline jkasch  United States
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I don't know. Maybe I'll have to track down a good tech.

Thanks for suggestions.
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