View Single Post
  #28  
Old 02-26-2011, 07:28 AM
Reece's Avatar
Reece Reece is offline
VideoKarma Member
 
Join Date: Jul 2004
Location: Cleona, PA
Posts: 2,178
You can do a few checks before changing any parts. Grid leak is supposed to be 3 megohms. Anything within a few megs at this point should work for starters. Check with your ohmmeter the caps and as long as they aren't shorted the set should work somewhat.

Touch your finger or a screwdriver with your finger on it to the grid of the first audio tube: should get scratches and hum from the speaker if first and second audio tubes and second audio transformer are good.

If that works, take your antenna wire loose and touch it to the stator of the tuning condensor that goes to the detector tube. If your detector and audio stages are OK should hear a station by tuning around, maybe not too loud. If no noise, suspect the first audio transformer.

Move the antenna wire back to the next stator before the detector and test, and finally to the first one. If you lose signal somewhere look for a problem in that stage.

Problems could be open coils. Can just check each coil for continuity with your ohmmeter. Ditto each audio transformer winding. Not much to go wrong in these sets.
__________________
Reece

Perfection is hard to reach with a screwdriver.
Reply With Quote