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.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Jolida JD9 Upgrade/Mods Clarification.	nathanjh13	Analog Line Level	35	30th December 2012 03:05 AM
Better Sounding Direct Replacement For OPA OP37 In Jolida JD9 Phono Stage	XTRprof	Analogue Source	5	30th June 2007 10:00 AM
Help with Jolida 302A	sobreiro	Tubes / Valves	4	2nd September 2004 02:00 PM
Jolida-Shanling	Facciadaprete	Digital Source	3	10th May 2004 02:43 PM
Jolida JD100H	maya1	Digital Source	0	24th April 2004 08:14 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

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.