Failing Power Transformer Secondary Test

ghostyjack · 1217

0 Members and 1 Guest are viewing this topic.

Offline ghostyjack

  • Jr. Member
  • **
    • Posts: 20
on: March 26, 2018, 05:33:42 AM
Hi,

I just started the soldering of my crack and did the powerline voltage test on page 23 of the manual, This read 244v (I live in the UK). So after consulting the manual, I skipped to page 28 and soldered the wires as per this page.

Problem is, that when I do the  power transformer secondary test between terminals 7 and 9, I get 0v.

Not sure what's wrong, I can't see any bad joints.

Any suggestions?



Offline Doc B.

  • Administrator
  • Hero Member
  • *****
    • Posts: 9643
    • Bottlehead
Reply #1 on: March 26, 2018, 05:57:11 AM
Did you put the fuse in? Power switch on?

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.


Offline ghostyjack

  • Jr. Member
  • **
    • Posts: 20
Reply #2 on: March 26, 2018, 06:34:31 AM
Fuse is in and it is switched on.

I've done a resistance check to see if the switch is working and when off it is open circuit, and when on it is very low resistance.



Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19700
Reply #3 on: March 26, 2018, 06:38:31 AM
Does the proper voltage appear between 11 and 12 on the power transformer?

Some meters are terrible with low voltage AC, so if you see the high voltage coming out of the transformer, you could proceed to wire up the heaters and do the glow test.  (If your tubes glow, the voltage is there, it might just be hard to measure)

If your meter has multiple ranges for AC voltage, be sure you're down around the appropriate one.  A meter that has a 1000V AC scale might just not be able to resolve 6V unless the range is turned way down.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline ghostyjack

  • Jr. Member
  • **
    • Posts: 20
Reply #4 on: March 26, 2018, 06:48:47 AM
Thanks for the replies.

I got 177v across 11 and 12.

Had a look at the meter and yes, looks like it was having problems resolving the scale. dug out a second meter I used to use for reading up to 100v and it displayed 6.6v.

Looks like i didn't blow it up yet.  :)