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In lieu of GZ37?
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My favorite indirectly heated rectifier. Sounded excellent in my Supratek preamp when I was using that; smooth and very musical. When I bought the Mullard pair I have I paid less than half of what a Mullard GZ34 was going for.
Here's one going really cheap so far on e-bay (no affiliation!):
Mike Samra is correct about the '34 drawing less heater current. However, forward drop in the '37 is greater and the '37 can furnish more B+ current. A GZ37 can furnish 275 mA. of B+ working into a cap. I/P filter. Working into a choke I/P filter, a GZ37 can furnish 350 mA. of B+ current. The 5AR4/GZ34 is good for 250 mA.
If the total B+ draw of the circuitry is 250 mA. or less, a 5U4GB is a definite possibility. No slow B+ rise here, but the forward drop characteristic should be pretty darned good.
Eli D.
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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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 :)
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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