SF Deluxe Reverb (5U4GB Rect) - Change PT for GZ34?

[johnny99]

Hey guys,
I have a SF Deluxe Reverb, converted to BF schematic. But I've left the 5U4GB rectifier in place, since I was told that the SF PT is different and outputs too much voltage for use with a GZ34.

That seems legit, since I'm already getting a very high B+ of 456V, so blindly changing the rectifier tube to a GZ34 would have the B+ at almost 500V!

The reason I'm interested in running a GZ34 is that I'd like less sag when I'm playing loudly. Am I correct in thinking this rectifier tube has less sag?

CE Distribution has a PT (P-TF41316) that says "Replacement for Fender Deluxe, Deluxe Reverb. Equivalent to #125P23B." and is specced at:

Primary 117 V, 60 Hz
Secondary 330-0-330 VAC @ 120 mA, 340 VDC @ 120 mA, with 50 V bias tap

Would this be an appropriate substitution to run a GZ34 in the Deluxe Reverb? And what B+ would I expect to see?

[martin manning]

This spec sheet for a DR replacement PT, rated 330-0-330 at 120 mA, shows voltages for different rectifiers at two DC current levels: http://www.classictone.net/40-18016.pdf

[johnny99]

This spec sheet for a DR replacement PT, rated 330-0-330 at 120 mA, shows voltages for different rectifiers at two DC current levels: http://www.classictone.net/40-18016.pdf

Thanks Martin, those voltages are way more reasonable. Maybe I'm paranoid, but running such high B+ has me worried that the 6V6's are gonna give up the ghost onstage.