first build few issues

pogue · 4601

0 Members and 1 Guest are viewing this topic.

Offline pogue

  • Jr. Member
  • **
    • Posts: 12
on: November 27, 2014, 06:07:15 AM
built my first kit which is a steromour. hope this is the right place to post my issues. resistance test results are not right. the following are my results. thanks for all help.
#2   1 mega ohm (possible sort)
#11  0 mega ohm
#14  1 mega ohm
#16  0 mega ohm
#20  0 mega ohm



Offline fullheadofnothing

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 1487
  • A noble spirit embiggens the smallest man
Reply #1 on: November 27, 2014, 07:25:02 AM
This seems like it could be either a problem with an autoranging meter, or something is indeed miswired. Are all other points reading correctly? Can you post pictures of your build?

Joshua Harris

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


Offline pogue

  • Jr. Member
  • **
    • Posts: 12
Reply #2 on: November 27, 2014, 09:22:36 AM
meter seems like it works fine. tested it on other things. the above issues are present and a1,a4,c1 and c4 all read zero. have not turned it on, not sure if it is safe to turn on. thanks



Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19757
Reply #3 on: November 27, 2014, 09:27:37 AM
meter seems like it works fine. tested it on other things. the above issues are present and a1,a4,c1 and c4 all read zero. have not turned it on, not sure if it is safe to turn on. thanks

That is a very good decision to make at the moment. 

There are a few scenarios here that can cause A/C 1/4 to read 0.  It's possible that the center lug of the hum pots are making contact with the chassis.  If this is the case, do remedy this as best as you can.

The other possibility is that the capacitor across the 1.6K/4.7K paralleled cathode resistors is fouling up your meter's reading.  To test this, you can pop out the black wires that go to "K" on the PC board, then recheck your measurements.  (It's easy enough to heat the PC board joint and slide the wire out, measure, then reheat the joint and pop the wire back in)

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline pogue

  • Jr. Member
  • **
    • Posts: 12
Reply #4 on: November 27, 2014, 10:46:14 AM
between 11 and 14 on pt-6 i get zero ohms is this a correct reading or do i have a problem.the other filament wire meter 1 or infinity. thanks



Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19757
Reply #5 on: November 27, 2014, 11:08:49 AM
The filament windings on the PT-6 will read nearly 0 Ohms end-to-end.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline pogue

  • Jr. Member
  • **
    • Posts: 12
Reply #6 on: November 27, 2014, 11:44:09 AM
all my readings check out except for t2,t4,t12 and t14 i'm just getting infinity any ideas. checked all connections and everything looks good. thanks paul



Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19757
Reply #7 on: November 27, 2014, 11:48:05 AM
Triple check that the 249K resistors are in properly.  If they aren't, that will lead to some odd voltages and unhappy 2A3's.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline pogue

  • Jr. Member
  • **
    • Posts: 12
Reply #8 on: November 27, 2014, 11:53:42 AM
only t4 and t14 left both are reading infinity. thanks for the fast replies. 



Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19757
Reply #9 on: November 27, 2014, 12:13:06 PM
T4 and T12 are electrically identical, with a 249K resistor going from each to ground terminals on the center terminal strip. 


T2 and T14 are electrically identical, and are likely to read infinity.

I'd look to get consistent readings between these pairs if possible.  What happens when you put your meter probes across the 249K resistor from T4 to T6? 

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline pogue

  • Jr. Member
  • **
    • Posts: 12
Reply #10 on: November 27, 2014, 12:44:05 PM
between t4 and t6 i get 246k. i applied voltage to the system and got burning smell and the 1.6k resistor became really hot on a"A"side. the "C" side was cool. are these resistors directional. THANKS



Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19757
Reply #11 on: November 27, 2014, 02:02:28 PM
The resistors aren't directional, but the capacitors are.  Can you post a photo of the "A" side socket?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man