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ZTPRE hum (Read 3005 times)
Audioqwest
Ex Member
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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Steve Deckert
Administrator
*****


If the 1st watt
sucks why continue?

Posts: 6246
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
Ex Member
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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