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AUDIO FORUMS >> General Discussion and Support >> ZTPRE hum
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Message started by Audioqwest on 12/11/12 at 03:00:12

Title: ZTPRE hum
Post by Audioqwest on 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!

Title: Re: ZTPRE hum
Post by Steve Deckert on 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

Title: Re: ZTPRE hum
Post by Audioqwest on 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.