Power Transformer Test Issue [resolved]

oguinn · 5686

0 Members and 1 Guest are viewing this topic.

Offline oguinn

  • Sr. Member
  • ****
    • Posts: 895
on: January 31, 2020, 09:33:14 AM
Hey guys. Started the Kaiju build and got to the first power transformer test. I’m seeing 119-120 VAC coming from the wall, but I’m only seeing 5.4VAC when I’m running the first test on page 33. I’ve reviewed the wiring a couple times, and I’ve tested continuity between each PT-9 lug and the terminal strips. I’m still not seeing 190 VAC. Here’s a picture of the PT. https://imgur.com/a/zwna7rr
« Last Edit: February 03, 2020, 10:26:33 AM by Paul Birkeland »

Jameson O'Guinn

-

Main System: Schiit Bifrost MB, Rega Planar 6 with Exact cartridge, Eros 2, BeePre, Kaiju/Stereomour II, Jagers, Mainline

Desktop System: Crack with Speedball


Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19497
Reply #1 on: January 31, 2020, 09:53:12 AM
What AC voltage do you see between terminals 1 and 3 on the power transformer?

I would recommend doing the rest of the power transformer secondary tests as well.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline oguinn

  • Sr. Member
  • ****
    • Posts: 895
Reply #2 on: January 31, 2020, 10:01:31 AM
1 & 3: 119V
7 & 8: 5.3V
9 & 10: 6.55V
11 & 14: 6.56V
12 & 14: 6.57V
« Last Edit: January 31, 2020, 10:04:36 AM by oguinn »

Jameson O'Guinn

-

Main System: Schiit Bifrost MB, Rega Planar 6 with Exact cartridge, Eros 2, BeePre, Kaiju/Stereomour II, Jagers, Mainline

Desktop System: Crack with Speedball


Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19497
Reply #3 on: January 31, 2020, 10:06:15 AM
If your meter happens to have selectable ranges and there's a 200V setting, you may need to go up one click on the dial to resolve the secondary Kaiju voltage.

If that isn't the case (I suspect it's not by the way), then we would like to get that power transformer back for inspection. 


Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline oguinn

  • Sr. Member
  • ****
    • Posts: 895
Reply #4 on: January 31, 2020, 10:18:28 AM
Yeah, it auto-ranges.

Should I plan to ship it to you guys? How should I prep it? Unsolder or trim the wires?

Jameson O'Guinn

-

Main System: Schiit Bifrost MB, Rega Planar 6 with Exact cartridge, Eros 2, BeePre, Kaiju/Stereomour II, Jagers, Mainline

Desktop System: Crack with Speedball


Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19497
Reply #5 on: January 31, 2020, 11:25:13 AM
I would desolder the wires. If you don't have the packing, transformers ship pretty well when they are wrapped tightly in tons of cardboard, then a little bubble wrap around the outside.  I'll let Eileen know about this today as well.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline oguinn

  • Sr. Member
  • ****
    • Posts: 895
Reply #6 on: January 31, 2020, 11:27:10 AM
Ok, got it. I just emailed Eileen and Doc as well. What’s the best address these days? I’ll try to get it in the mail this afternoon.

Jameson O'Guinn

-

Main System: Schiit Bifrost MB, Rega Planar 6 with Exact cartridge, Eros 2, BeePre, Kaiju/Stereomour II, Jagers, Mainline

Desktop System: Crack with Speedball


Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19497
Reply #7 on: January 31, 2020, 11:30:12 AM
Eileen will let you know.  She may have you send it to me for a tear-down, or she may want to send it back to our winder.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline oguinn

  • Sr. Member
  • ****
    • Posts: 895
Reply #8 on: January 31, 2020, 11:32:50 AM
Thanks, Paul. I’ll wait to hear from her.

Appreciate your help.

Jameson O'Guinn

-

Main System: Schiit Bifrost MB, Rega Planar 6 with Exact cartridge, Eros 2, BeePre, Kaiju/Stereomour II, Jagers, Mainline

Desktop System: Crack with Speedball


Offline oguinn

  • Sr. Member
  • ****
    • Posts: 895
Reply #9 on: February 03, 2020, 09:30:45 AM
New power transformer arrived today. Everything’s looking good! Thanks for the quick turnaround on this.

Jameson O'Guinn

-

Main System: Schiit Bifrost MB, Rega Planar 6 with Exact cartridge, Eros 2, BeePre, Kaiju/Stereomour II, Jagers, Mainline

Desktop System: Crack with Speedball


Offline newfangled

  • Newbie
  • *
    • Posts: 3
Reply #10 on: May 14, 2023, 02:11:21 PM
I just started building the Kaiju this weekend. Unfortunately the power transformer secondary test on page 33 does not pass for me. I'm only getting 137V on pin 7/8; not 190V like I'm supposed to. I triple checked my wiring and solder connections. When unplugged off I'm getting the correct continuity readings.

I measure 120.8V from the wall therefore I used the "IF your voltage is GREATER than 115V AC and LESS than 130VAC" guide on page 30.

Actual VAC readings using a known working Fluke multimeter. (I used autorange and also tried 200V and 600V range just to make sure)

1/3 = 120.8V
4/6 = 120.8V
7/8 = 137.0V
9/10 = 6.5V
11/14 = 6.5V
12/13 = 6.5V

Is there any other trouble shooting I can do to narrow down if it's an issue with my wiring or could be the transformer?



Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19497
Reply #11 on: May 15, 2023, 04:44:08 AM
We will swap you out with a replacement.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline newfangled

  • Newbie
  • *
    • Posts: 3
Reply #12 on: May 28, 2023, 12:20:35 PM
Replacement power supply received on 5/22/2023. Happy to report that fixed my issue. Even happier that less than I week later I completed the full build including half day of listening to the stock filament power supply. Lowest hum I could achieve was 6.8mV on both channels. I upgraded to the DC filament power supply. Didn't take another measurement but that knocked the hum down to inaudible levels from my listening chair.



Offline stuart.mclean

  • Jr. Member
  • **
    • Posts: 10
Reply #13 on: September 03, 2023, 03:13:22 PM
My page 33 power transformer tests are failing as well, but much more dramatically.  0.031 to 0.036 V AC on pins 7 & 8 AND a blown fuse.  I've redone the wiring with the same results.  Passes first power test with 126.4 V but when I follow the instructions for wiring for that range and run the tests it returns a tiny voltage and the fuse blows.
Other test results:
1/3 .041
9/10 .029
11/14 0.26
12/13 0.26

The Kaiju kit was delivered April 3, 2023.



Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19497
Reply #14 on: September 04, 2023, 05:13:18 AM
Can you post some photos of your build so far?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man