Champ 5F1 with 7591

[mikhett]

I'm building a 5F1 with  7591 output tube instead of a 6V6 because I have some spares from a gutted Ampeg .Anyone ever tried it? Thanks

[Latole]

Heater need almost twice heater current

[Stuff4bikes]

I have a 5f2a clone with a 7868 that sounds very nice..

[sluckey]

I like 7591s. You may need to use a different cathode resistor.

[mikhett]

I do I increase heater current without changing the transformer?

[mresistor]

What power transformer are you using and what is the rating of the 6.3VAc winding?

[sluckey]

I do I increase heater current without changing the transformer?

I don't understand your question.

The 12AX7 and 7591 will want 1.1A current. Is that a problem? How much filament current can your PT supply?

[mikhett]

Typo SORRY.HOW do I increase heater current without changing the transformer?I'm using a stock Champ transformer.THANKS

[sluckey]

Don't worry about it. The Hammond 290AX Champ replacement is rated for 6.3V @ 2.25A. More than enough for a 7591. I suspect other champ replacements are rated similarly.

[mikhett]

Thanks MR.SLUCKEY!