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Input sockets dead (Read 4770 times)
Jeff of Arabica
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Input sockets dead
01/04/17 at 02:09:28
 
I have a brand new ZP3 and am having issues with my input tube sockets.  At first the front 12AX7 tube blew.  The silver coating at the top of the tube turned to a white powder.  I ordered a new set of tubes and now I am getting no power to either of the input tube sockets.  I tested the new tubes on another amp and they work fine.  Also, the ZP3 is getting power as all other tubes are glowing except the two input tubes.

Any ideas?  I already emailed tech but thought I would see if anyone else has experienced a problem such as this.
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hdrider
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Re: Input sockets dead
Reply #1 - 01/04/17 at 21:29:46
 
Jeff- Sorry to hear about the headaches your having. I have never had a problem with my ZP3 so I can't be much help. I would reach out to Steve (assuming you got it from Decware) and if you didn't I would spend the money to have Decware bench it and transfer the warranty. Just my opinion bro, Chris.
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Jeff of Arabica
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Name the greatest of
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Posts: 909
Re: Input sockets dead
Reply #2 - 01/04/17 at 21:49:13
 
Thanks Chris.  Fortunately I did get it from Decware.  I got a message out to Steve so Ill see what he thinks.  Figured I would check with others just in case.  Strange it is just affecting those two inputs tubes as everything else is getting power.  We shall see...
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Canary Audio Grand Reference//ZMA//Zen Ultra//Taboo MKIII//PS Audio DirectStream DAC + Memory Player + P10//Canary Audio MC-10 Phono Stage//London Decca Reference//Dynavector DV-507 MKII//SonoruS Reel-to-Reel w/ tube playback pre-amp//Tannoy Westminster Speakers
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Denizen
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Posts: 33
Re: Input sockets dead
Reply #3 - 01/04/17 at 23:41:27
 
It sounds as though the bridge rectifier for the tube heaters is fried. The tube rectifier uses a different voltage and a different transformer winding
and the VR tube is a glow tube the voltage from the tube rectifier is what lights it up. I've never seen it happen, but should be an easy fix,unfortunately it will require a trip back to the shop.
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hdrider
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Re: Input sockets dead
Reply #4 - 01/07/17 at 16:11:28
 
Jeff / Denizen - I know it's kind of a pain in the arse, but sending back to Steve means that he/they will be going over that with a fine tooth comb. I know I would be frustrated but I also know that Steve and team view each one of these products like a child. Keep us posted on the return. Happy listening when it comes, Chris.
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CSP3, Rachael, ZP3, ZMC 1, Oppo BDP-93, Sota Star TT w/ FR-64, Dynavector D17 DX Moving coil, Omega 7XRS Mk 2 walnut, DeepOmega 8 sub, Morrow Audio PH3 and MA3 IC's, Gamma Electrostatic phones.
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Jeff of Arabica
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Name the greatest of
all inventors...
Accident.

Posts: 909
Re: Input sockets dead
Reply #5 - 01/10/17 at 00:58:02
 
ZP3 on its way back to the mother ship!  Thanks for the input guys.
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Canary Audio Grand Reference//ZMA//Zen Ultra//Taboo MKIII//PS Audio DirectStream DAC + Memory Player + P10//Canary Audio MC-10 Phono Stage//London Decca Reference//Dynavector DV-507 MKII//SonoruS Reel-to-Reel w/ tube playback pre-amp//Tannoy Westminster Speakers
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back2vinyl
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Posts: 44
Re: Input sockets dead
Reply #6 - 02/06/18 at 01:42:53
 
Did you get it fixed?
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Steve Deckert
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Re: Input sockets dead
Reply #7 - 02/06/18 at 02:59:12
 

We'll be curious to see what could cause only the two front tubes not to glow when all three are on the same supply!  

One thing that should help a lot of people who are newer to tubes and reading this post, is that any time a tube looses it's silver color and turns powdery white inside it means that the tube has lost it's gas indicating that there is a crack somewhere in the glass.  When a tube actually fails during operation it never does that, instead it just turns dark.  A common time for a tube to have a catastrophic failure (internal short) is when the glass cracks or breaks.
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