6.5v into 12au7 too high or within spec?

audiblesoundwave · 5228

« previous next »
Pages: 1   Go Down

0 Members and 1 Guest are viewing this topic.

Offline audiblesoundwave

  • Full Member
  • ***
    • Posts: 60
on: October 08, 2014, 02:11:43 PM
As I have been trying to isolating a different problem on my FPIII, I measured 6.5v for both of the 12au7s heater voltage.

Is it too high or within the safety range?  Will it shorten the tube life with the higher voltage?  Just like to double check.

Thanks,
Milton


Offline galyons

  • Sr. Member
  • ****
    • Posts: 626
  • Geary Lyons
Reply #1 on: October 08, 2014, 02:23:53 PM
Milton,
The spec for the 12AU7 heater filament voltage is 6.3V +/- 10%.  You are good to go at 6.5! That is well within normal range, given line voltage variations.

Cheers,
Geary
« Last Edit: October 08, 2014, 02:33:43 PM by galyons »

VPI TNT IV/JMW 3D 12+Benz LP-S>  Eros + Auralic Aries + ANK Dac 4.1 >Eros TH+ Otari MX5050 IIIB2 > BeePre >Paramount 300B 7N7 > EV Sentry IV-A

Thorens TD124/Ortofon RMG-212/SPU >Seduction > Smash^Up> Paramour 45 MQ >K12's

Offline audiblesoundwave

  • Full Member
  • ***
    • Posts: 60
Reply #2 on: October 09, 2014, 05:38:51 PM
Thanks Geary!

Have a wonderful weekend,
Milton


Pages: 1   Go Up
« previous next »