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ZTPRE hum (Read 626 times)
Audioqwest
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Posts: 14
ZTPRE hum
12/11/12 at 03:00:12
 
When I switch the unit to high gain, it has quite a hum to it. I've tried new tubes, a couple amps of differing sensitivity and unrelated power sources with no change. Ideas?

Also, does anyone have a schematic of this unit?

Thanks and Season's Greetings!
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« Last Edit: 12/11/12 at 03:08:30 by Audioqwest »  

Apogee Scintilla - 1 ohm (painted Sterling Gray Metallic RM base/clearcoat by yours truly), Decware ZTPRE, Theta Pearl & DS Pro Prime II, Parasound T/DQ 1600, Threshold S/200.
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Steve Deckert
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If the 1st watt
sucks why continue?

Posts: 2402
Re: ZTPRE hum
Reply #1 - 12/17/12 at 18:17:26
 
Hi Audioqwest,

Sounds like either a ground loop between it and some other component, or possibly a loose ground somewhere inside the unit.  They were known for being quiet.  If you send it in to us for a look over, use the RA form on the site and include the power supply and cable.

Thanks,

Steve
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Audioqwest
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Posts: 14
Re: ZTPRE hum
Reply #2 - 12/29/12 at 16:52:39
 
Ok, thanks. I'll check it over a bit and send it in if needed. It's perfectly quiet on the low gain setting, only large hum on high gain.
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Apogee Scintilla - 1 ohm (painted Sterling Gray Metallic RM base/clearcoat by yours truly), Decware ZTPRE, Theta Pearl & DS Pro Prime II, Parasound T/DQ 1600, Threshold S/200.
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