Power Transformer Test Issue [resolved]

[Paul Birkeland]

Does the fuse hold if you don't have your meter hooked up to the power transformer?

 

[stuart.mclean]

No. I saw the flash in the IEC unit and checked - it was blown.

 

[Paul Birkeland]

I would pop all four wires off terminals 1-6 on the power transformer and just let them poke up into the air, then be sure a fuse holds under these conditions.

 

[stuart.mclean]

Disconnected the 4 wires.  Turned on power for about 30 seconds.  Fuse did not blow.

 

[Paul Birkeland]

Can you measure the DC resistance between power transformer terminals 1 and 3? Also 4 and 6?

 

[stuart.mclean]

Resistance between 1 and 3 is 0.6.  Between 4 and 6 it is 4.5.

 

[Paul Birkeland]

You'll need to contact replacementparts(at)bottlehead(dot)com and let them know that you need a replacement PT-9.  Be sure to post a link to this thread which helps expedite the process.

-PB

 

[stuart.mclean]

Thanks!  I'll get that in right away.

 

[stuart.mclean]

I received the replacement power transformer (PT-9) - Thanks! - and installed it with new wiring. The new transformer is working well, but I'm getting values that are very slightly outside tolerance:
PT Leads 7 & 8: 200 [manual states 190 +/- 5%]
            10 & 9: 6.84 [manual states 6.3 +/- 5%]
          14 & 11: 6.84 [manual states 6.3 +/- 5%]
Incoming voltage is 126 so I wired with the > 115 and < 130 instructions.
Does this call for any adjustment to the build?
Thanks for all your help so far!

 

[Paul Birkeland]

Incoming voltage is 126 so I wired with the > 115 and < 130 instructions.

Your powerline is about 5% high and causing the voltages to creep up a little bit, but those are OK.