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Pearl 2 Crackling on Left Channel
Pearl 2 Crackling on Left Channel
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Old 13th June 2020, 02:43 AM   #11
hirscwi is offline hirscwi  United States
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Pearl 2 Crackling on Left Channel
I replaced the ZVP3310 along with the CCS (Q10 and Q11 - ZTX450). It seems to be working just fine now.

I do have a question about zeroing the DC at the test point (using P1). The closest I can get to 0 is about 25mV and it sometimes climbs to 200 mV after a few minutes. Is this normal? I am measuring with the cartridge connected to the circuit.

Thanks for the assistance.
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Old 13th June 2020, 02:57 AM   #12
codyt is online now codyt  United States
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I recall that being normal when I built mine. I did end up putting a bit of capacitance in series with R14, which keeps offset rock solid.

Quote:
Originally Posted by hirscwi View Post
I replaced the ZVP3310 along with the CCS (Q10 and Q11 - ZTX450). It seems to be working just fine now.

I do have a question about zeroing the DC at the test point (using P1). The closest I can get to 0 is about 25mV and it sometimes climbs to 200 mV after a few minutes. Is this normal? I am measuring with the cartridge connected to the circuit.

Thanks for the assistance.
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Old 13th June 2020, 11:16 AM   #13
hirscwi is offline hirscwi  United States
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Pearl 2 Crackling on Left Channel
Thanks.
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Old 15th June 2020, 12:50 AM   #14
hirscwi is offline hirscwi  United States
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Pearl 2 Crackling on Left Channel
For what it's worth, I had to replace both ZVP3310s because I was getting quite a bit more gain from the right channel after replacing the ZVP3310 on the left channel. Must have been different gain codes?
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Old 15th June 2020, 05:22 AM   #15
mymindinside is offline mymindinside  United States
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Hirscwi, what precautions did you take to keep the ZVP3310 ESD safe while installing it?
I'm starting on my Pearl2 and dont want to fry mine while stuffing the boards..

One method i've seen recommended is to short the gate pin to source (with foil or a clip). I do have a wrist strap but am not sure where to connect it on my workbench, don't have an accessible ground point.

Just in case, i do have some spares...
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Old 15th June 2020, 11:50 AM   #16
hirscwi is offline hirscwi  United States
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Pearl 2 Crackling on Left Channel
I used wrist straps connected to ground of house wiring.
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Old 16th June 2020, 02:02 AM   #17
mymindinside is offline mymindinside  United States
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Ah ok, ��
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Old 30th June 2020, 04:57 AM   #18
Super_BQ is offline Super_BQ  New Zealand
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Quote:
Originally Posted by hirscwi View Post
For what it's worth, I had to replace both ZVP3310s because I was getting quite a bit more gain from the right channel after replacing the ZVP3310 on the left channel. Must have been different gain codes?
After uncovering my Penultimate Zen (aka Zen v4) monoblocs. I've discovered 1 channel is also louder than the other. It's quite noticeable with Klipschorns. The affected amp also seems to show little mid-range sound.

Will double check if the cables could be the source of the problem because i'm not keen on unsoldering all the TO-247 IRF transistors (3 per board x 2 as i'm running 2 boards per channel in balanced mode).

I do know the Zen v4 uses the same ZVP3110 and ZTX450 transistors. I have plenty of spares for which they were purchased around the same time I built these monoblocs (circa 2002).
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Old 1st July 2020, 02:10 AM   #19
Super_BQ is offline Super_BQ  New Zealand
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OK - all is fixed.

https://i.imgur.com/Ogn6HsD.jpg
https://i.imgur.com/srXuGwE.jpg

As I suspected, bad ZVP3310A input mosfet. I had 40V showing on the input +
Being in monobloc config, I tested each side individually, clearing the 1 was like half the output and slightly distorted.
 

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