Help with voltage check

s0ap · 2086

« previous next »
Pages: 1   Go Down

0 Members and 1 Guest are viewing this topic.

Offline s0ap

  • Newbie
  • *
    • Posts: 3
on: February 17, 2015, 10:43:02 AM
I've reread the manual and checked the wiring, as far as I can tell it's all correct.
All resistance checks were good. I am building the 120 volt version of the kit.
My problem is all the voltages are wrong, here is what differs from the manual.
1 - 240V
2 - 240V
4 - 240V
5 - 240V
7 - 0
9 - 0
13 - 240V
15 - 240V
21 - 240V
A1 - 240V
A6 - 240V
B1 - 240V
B2 - 240V
B3 - 0
B4 - 240V
B5 - 240V
B6 - 0
Neither of the tubes glow. I've never worked with electronics before and have no idea where to go from here.
Any help is much appreciated, Thanks.
« Last Edit: February 17, 2015, 10:45:08 AM by s0ap »


Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19751
Reply #1 on: February 17, 2015, 10:48:55 AM
Try posting some photos of your build.

What wall voltage are you able to measure?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline s0ap

  • Newbie
  • *
    • Posts: 3
Reply #2 on: February 17, 2015, 11:30:06 AM
I have 122 volts from the wall. Here are some pictures

(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fi1380.photobucket.com%2Falbums%2Fah167%2Fdrew5538%2FIMG_20150217_165902_zps23292d6a.jpg&hash=a042d844dbe916053bb248dac5a75fc0a9d27d1f)
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fi1380.photobucket.com%2Falbums%2Fah167%2Fdrew5538%2FIMG_20150217_165939_zpsf47beee2.jpg&hash=7c2be52f91cc3384345cf088fe51d54d81727cd6)
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fi1380.photobucket.com%2Falbums%2Fah167%2Fdrew5538%2FIMG_20150217_165932_zps5f7a9ebe.jpg&hash=e37a2a9761c96d9963ad5c92367ce25ceb56e500)
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fi1380.photobucket.com%2Falbums%2Fah167%2Fdrew5538%2FIMG_20150217_165923_zpse552922d.jpg&hash=7bf339007b82e4f0911a8d51a6e037c2f37ef924)


Offline fullheadofnothing

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 1487
  • A noble spirit embiggens the smallest man
Reply #3 on: February 17, 2015, 11:47:38 AM
The lack of glow on the tubes is a strong hint that something is wrong with the heater circuit. The pictures don't show terminals 4&5 on the power transformer because the 270Ω resistor is in the way. Can you post a picture of those terminals?

Joshua Harris

I Write the Manuals That Make The Whole World Sing
Kit Packer Emeritus

Offline s0ap

  • Newbie
  • *
    • Posts: 3
Reply #4 on: February 17, 2015, 12:29:21 PM
How does this look?
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fi1380.photobucket.com%2Falbums%2Fah167%2Fdrew5538%2FIMG_20150217_181821_zps872da0b2.jpg&hash=fd55bdb9f50b098dd06729dd05b7038f5f7b43bc)


Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19751
Reply #5 on: February 17, 2015, 12:31:33 PM
Try measuring the AC voltage between power transformer terminals 4 and 5. 

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Rocketman248

  • Full Member
  • ***
    • Posts: 156
Reply #6 on: February 18, 2015, 06:22:24 PM
It looks like you've got B1 and B2 connected.  I don't believe they should be.

Nick DeBrita
Yokosuka, Japan

Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19751
Reply #7 on: February 18, 2015, 07:21:54 PM
Good catch on B1/B2.

It also looks like B3 may be wired to the wrong terminal (check the 2.49K resistors if this is the case, one may be really burned).

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline i luvmusic 2

  • Full Member
  • ***
    • Posts: 235
Reply #8 on: February 19, 2015, 10:00:33 AM
Is there something in between B7 and B8?I could be wrong...


Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19751
Reply #9 on: February 19, 2015, 10:11:08 AM
Quote from: i luvmusic 2 on February 19, 2015, 10:00:33 AM
Is there something in between B7 and B8?I could be wrong...
You could be very right.  If those terminals were shorted by a piece of wire, the outcome would be roughly the voltages listed above.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Pages: 1   Go Up
« previous next »