[NJARC] Re: Early 1930s Superhet Coil Nomenclature Challenge

[radiomf at comcast.net]

Hi Lisa,
>From that we can assume that ALL 570 grandfather clock sets are the early version without AVC.
Not sure what you are asking, but I will name the coils on the schematic starting from the upper left is the antenna coil (or transformer) marked as #2 it is between the volume control and first 24 tube. Next ,between that 24 tube and the 2nd 24 is #6. This is the coil you need and is usually called an RF interstage transformer. Philco called it the 1st detector coil. Below and in series with the secondary of the detector coil is the oscillator coil marked as #8. Between the 2nd and 3rd 24 tube is the 1st IF transformer # 19. Between the 3rd and 4th 24 tube is the 2nd IF transformer # 22.  Between the 47 tube and the speaker is #37 the Audio Output Transformer.  # 39 is the speaker Field Coil (choke). Finally #42 is another Choke in the power supply.
Marty
-------------- Original message -------------- 
From: <oleradiogal at verizon.net> 

> Marty write: 
> >First , we must agree that the radio in question is the early 
> >version WITHOUT AVC. 
> 
> I found the schematic for my Philco Grandfather Clock 570 on Philco page 101 in 
> Rider's Abridged Manual Vol I-V for Model 70, 70A, serials under B-22,000 & 
> Model 570. 
> 
> Based on my limited knowledge of what AVC circuits look like, I see no evidence 
> of AVC in the schematic. 
> 
> So, NOW can you take the challenge? :-) 
>