Correct Resistances, Problematic Voltage Readings

Karmafloyd · 1476

0 Members and 1 Guest are viewing this topic.

Offline Karmafloyd

  • Newbie
  • *
    • Posts: 5
on: November 01, 2014, 01:40:29 PM
Hello and thank you for your assistance. 

Completed soldering and ran resistance checks, which passed.  A few voltages are significantly off, though. 

Terminal 7: 147 instead of 100
A1: 76 instead of 90
A6: 0 instead of 90
B1: 148 instead of 90
B3: 148 instead of 100
B4: 76 instead of 90.

The remaining terminals appear fine.  I also checked my soldering and the schematic, but was hoping this info might assist in a diagnosis.

Thanks again for any help. 



Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19696
Reply #1 on: November 01, 2014, 02:37:39 PM
A1: 76 instead of 90
That's OK, the 12AU7 is just conducting like a new tube.
A6: 0 instead of 90
A6 ties to T1, are they both reading 0?  Do both LED's glow on the 9 pin socket?  Do both halves of the tube light up?
B1: 148 instead of 90

B1 should be wired to A6 through terminal 1.  You can't have 148V at B1 and 0V at A6 without a wiring error present.

Focus on these for now, the rest of the odd voltages are odd because of these.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline Karmafloyd

  • Newbie
  • *
    • Posts: 5
Reply #2 on: November 01, 2014, 03:17:51 PM
I really appreciate it.  I will review tomorrow and report back.