View Single Post
  #4  
Old 03-31-2014, 07:19 PM
Reece's Avatar
Reece Reece is offline
VideoKarma Member
 
Join Date: Jul 2004
Location: Cleona, PA
Posts: 2,178
How many tubes? If there are three tuning condensers coupled mechanically together to one dial, I'm guessing it's a five tube TRF. The schematics for these were mostly very similar. On ones like this where I had no documentation I took the time to trace out and sketch and then draw the schematic and compare to schematics of similar sets. Usually the two RF stages are basically the same and then comes the detector which may only vary by having a grid condenser and grid leak, followed by a couple of audio stages usually with interstage transformers, which "like" to be open. The sets don't tend to have many fixed passive components. Sometimes when drawing out the schematic and then looking at it logically you'll see where somebody "fixed" it in the past.
__________________
Reece

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