Jolida JD9 Problem

jkasch · 15th May 2011, 11:26 PM

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.

DF96 · 16th May 2011, 12:03 AM

My guess is a cap or resistor, possibly in or around the RIAA network. Failing valves usually reduce volume. Both channels or just one?

jkasch · 16th May 2011, 01:13 AM

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.

DF96 · 16th May 2011, 12:43 PM

Both channels is puzzling. Perhaps an intermittent ground connection?

jkasch · 16th May 2011, 11:00 PM

I don't know. Maybe I'll have to track down a good tech.

Thanks for suggestions.

15th May 2011, 11:26 PM	#1
jkasch diyAudio Member Join Date: Jul 2008	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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16th May 2011, 12:03 AM	#2
DF96 diyAudio Member Join Date: May 2007	My guess is a cap or resistor, possibly in or around the RIAA network. Failing valves usually reduce volume. Both channels or just one?

16th May 2011, 01:13 AM	#3
jkasch diyAudio Member Join Date: Jul 2008	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.

16th May 2011, 12:43 PM	#4
DF96 diyAudio Member Join Date: May 2007	Both channels is puzzling. Perhaps an intermittent ground connection?

16th May 2011, 11:00 PM	#5
jkasch diyAudio Member Join Date: Jul 2008	I don't know. Maybe I'll have to track down a good tech. Thanks for suggestions.

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