Which resistors to use for KT88 output tubes


Hi, I'm looking for 5 watt 10ohm, 100ohm, and 2.2kohm resistors to use on the grid, screen, and plate of the KT88s in my amp build. I've looked into Kiwami, but most seem to feel Mills are better for this application. The Mundorf M-Resist Supreme resistors seem even better, but the largest value Mundorf is 33ohm. Any advice or other alternatives? Has anyone compared these resistors? Thanks.
dracule1

Showing 6 responses by dracule1

I was thinkin Mundorf for 10 ohm and Mills for 100 ohm. Isn't Rinken carbon? I'm kinda suspicious about the reliability and stability of carbon resistors. What's a good metal film resistor for 2.2kohm.

Although Mundorf and Mills claim theirs are noninductive, I would like them to provide inductance value. Reason being, inductance in this application could cause oscillations from what I've read. Is this a concern?
Hi Rodman, I don't see any mention of wirewound resistor being quieter than Vishay or Caddock in the link you provided. Is this from your personal experience?
Thanks Rodman. I read it again and saw the reference to wirewound resistors.

Based on the schematic of my KT88 amp, I see a 2.2 kohm 2 watt resistor to the control grid, a 100 ohm 5 watt resistor to the screen grid, and 10 ohm 5 watt plate resistor.

Obviously, the 10 ohm resistor should be a wirewound resistor. It will probably also be noninductive as well.

The control grid resistor should be a noninductive wirewound too.

It is the screen grid resistor that should be carbon comp because of its low inductance? Why can't I used a non-inductive wirewound resistor here?

PRC makes very high quality precision wirewound non-inductive power resistors.
http://www.precisionresistor.com/files/PDF/Precision-Power-SM-Series-Wire-Wound-Precision-Resistor.pdf
Thanks, Rodman. I Mills and PRC power resistors seem to be perfect for the job.