Hum problem with new built Stereomour [solved]

[jimiclow]

Hi Jimiclow

What was your hum reading before you lowered the plate dissipation?
How sensitive are the speakers you have?

IIRC, I think it's only 0.2-0.3mv higher.  I forgot to mention that I also lowered the 45 filaments to 2.39 volts. Plate was dissipating 11.25watts before mod.
I have a quad of 97db Hoyt bedfords 8" full range.

[Kmmm]

Yes, using the 4 ohm tap is a good idea.

At the moment the amp is wired for 16 ohm speakers
The AER's are 16 ohm. Should I use the 4 ohm taps?

Kaare

[Grainger49]

The rule of thumb is to use the one that sounds best.  The differences between the taps will not matter with 109dBW speakers.  Try 4 ohms and see if the hum diminishes.  If so then try the 8 ohm tap too.  See which sounds best to you.

[Paul Birkeland]

At the moment the amp is wired for 16 ohm speakers
The AER's are 16 ohm. Should I use the 4 ohm taps?

Oh heck yeah! The big disadvantage will be a loss of output power (at 108dB sensitivity, this is unimportant). 

[Kmmm]

WOW!
Just wiered it for 4 ohm and guess what!
We are down to 1,2mV hum on the 2a3
That I can totally live with!
Thank you so much for your time, all of you;)

Cheers
Kaare