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RE: Can I use GZ34 in my Art Audio Jota?

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Michael Samra

In Reply to: RE: Can I use GZ34 in my Art Audio Jota? posted by Jay Buridan on October 21, 2014 at 18:48:04

Jay
You can use a GZ34 in a GZ37 circuit but not the other way around because a GZ37 draws about an amp more filament current.
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Follow Ups:

I'd like my preamp to work a little harder - Jay Buridan 08:22:41 10/23/14 (1)
My speakers are so efficient that the volume wick is barely turned up. The system sounds great but I'd like to hear how it sounds with the preamp turned higher. So I was thinking maybe a different rectifier would change the equation? Will give GZ34 a try.

Thanks to all who chimed in :)
- A different rectifier won't change the gain very much. - JJ Triode 21:02:31 10/27/14 (0)
  If you want to run the preamp with a higher volume setting, you need to reduce the gain in the power amp. This can be done by inserting a voltage divider before the amp's first stage. It may be as simple as putting a resistor between the input jack and the tube pin in place of an existing wire.
  The exact specifics will depend on your amp.
  
  Doing this has several advantages. For one thing, if you are picking up some hum or other noise in your interconnects, this will attenuate it.

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