[Milsurplus] Fixing up an I-177B tube tester

[Paul Kraemer]

Ian
Took me more time than I care to admit to finally figure out and fix that TV7!
When it happened we were servicing some very old (tube) industrial equipment for a customer who soon after went out of business.
Got along without until I "retired" (ROF LOL) and started back into HR and restoring my beloved old radios.
Then it was a necessity and one of my first official hobby must fixes.

Bent pointer? I once straightened a zero center meter movement by reversing the polarity and carefully overloading it again.

Paul K0UYA


----- Original Message ----- 
  From: Ian Wilson 
  To: Paul Kraemer 
  Cc: milsurplus at mailman.qth.net 
  Sent: Friday, March 25, 2011 4:06 PM
  Subject: Re: [Milsurplus] Fixing up an I-177B tube tester


  Paul, Robert,


  I think this may be along the correct lines. I measured the voltage across the 25k series
  resistor and did some calculations. The meter position at 0.7mA - which should be half
  scale - isn't correct.


  I also note that the meter isn't on zero when the power is off, and the meter pointer is
  bent somewhat to the left.


  I will continue to work the other problem. I don't see any 47 ohm stopper resistors - perhaps
  these were a field modification?


  Thanks for the help so far!


  73, ian K3IMW