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Old 18th February 2013, 05:28 PM   #1811
poli is offline poli  Germany
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Hi Rich,
welcome to the club! Yeah, I am having similar experiences. I've been fiddling around with the Pearl 2 now more than a year and only have a very faint signal on both channels - strange that this happens on both channels at the same time. I made myself an "inverse RIAA" stage and checking the signal throughput with a signal generator and a small "inverse RIAA" signal, so that it simulates a MC cartridge, but so far no clue where the problem is. I re-soldered all pins again but that does not seem to be the problem. Voltages are also in range according to Waynes schematic. Anybody an idea what else to check?
Thanks
Poli
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Old 18th February 2013, 06:17 PM   #1812
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Hi 6L6 ,

I have changed cartridge . I'll check all the voltages again in the morning .
Just strange that distorted sound migrates from left channel to the other when the balance control is all the way to the left . The boards are separate -no physical way to short ????

Anyway , hope you and yours are well
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Old 18th February 2013, 06:25 PM   #1813
6L6 is offline 6L6  United States
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That sounds like a cartridge wiring issue, perhaps.

Andrew is 3 and a bit, and talking up a storm. We should skype sometime, he will seem huge!
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Old 18th February 2013, 06:42 PM   #1814
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Yes , Skype soon

I need to borrow a TT . I did some messing around with phone cables ,so maybe I did my usual LOL

Rich
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Old 18th February 2013, 10:16 PM   #1815
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Quote:
Originally Posted by poli View Post
Hi Rich,
welcome to the club! Yeah, I am having similar experiences. I've been fiddling around with the Pearl 2 now more than a year and only have a very faint signal on both channels - strange that this happens on both channels at the same time. I made myself an "inverse RIAA" stage and checking the signal throughput with a signal generator and a small "inverse RIAA" signal, so that it simulates a MC cartridge, but so far no clue where the problem is. I re-soldered all pins again but that does not seem to be the problem. Voltages are also in range according to Waynes schematic. Anybody an idea what else to check?
Thanks
Poli
I had one channel with a lot of noise (but also music) and changing out the ZVP3310 worked. Voltages were OK, but somehow the ZVP3310 wasn't. Have you put a jumper in the location of R15?
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Old 18th February 2013, 10:43 PM   #1816
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Hi Wellerman ,

was this post to me or Poli ?
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Old 18th February 2013, 11:03 PM   #1817
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Originally Posted by Wellerman View Post
I had one channel with a lot of noise (but also music) and changing out the ZVP3310 worked. Voltages were OK, but somehow the ZVP3310 wasn't.
What clued you that ZVP3310 was bad? Did you measure ~ 10 mA current going into per Wayne's voltages diagram?

I used 10R instead of 10K on R7, R8 and R10. I think I get carried away stuffing all the 10Rs. After replacing them, found out that Q1 and Q3 were bad. Waiting for an order of ZTX450s. I only ordered 10.
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Old 18th February 2013, 11:04 PM   #1818
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Default Bad MOSFET

Check the 2nd stage MOSFET (ZVP3310). I had a similar problem and a bad ZVP3310 in the affected channel was the apparent cause.
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Old 19th February 2013, 01:43 AM   #1819
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In my case it was lower gain and much higher distortion in the right channel. My tech. Mike Missel found it with his distortion meter.
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Old 19th February 2013, 01:48 AM   #1820
6L6 is offline 6L6  United States
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I really want a distortion meter...
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