[MRCA] TDO/BC-640 Items WTB:

[Yardleyite at aol.com]

In a message dated 11/29/2005 11:19:11 PM Eastern Standard Time,  
WA5CAB at cs.com writes:

The  mistake in your original post was that you wrote "BC-640" and meant  
"BC-460".  That confused several of us who know the BC-640.

I  have an original manual here on BC-460-B dated 30 June 1941.   
Characteristics of the TDO that you've mentioned (physical size, weight,  
tube complement, 
early Collins Autotune, etc.) all match.  So I  suspect that allowing for 
whatever differences existed between different  models of BC-460 and 
different models 
of TDO, they are probably  similar.  Not mentioned in your posts is the 
frequency range.   This manual (preliminary copy of TM 11-812B) says 
2,000-16,000 KC.  
However, per NAVSHIPS 900,116 dated 15 April 1946 specs and photo of TDO,  
front view photos look about the same but it says 2,000-18,1000 KC and a  lot 
more tubes in the RF chain.  So the TDO, strange is it may seem  to those 
familiar 
with Navy versus Signal Corps WW-II sets, must be a  later variant.




Rob,
       Not to confuse the matter, but it  seems my "TDO" also has a red 
Collins "16F" ID plate on the inside of the  door, and the instructional booklet 
that is also in the inner door has "TDO" and  BC-460-D model 8 listed on it. The 
frequency coverage is listed as being for 2  to 18.1 MHZ per the Collins 
model 16F plate. Also, the acceptance date on the  TDO plate is sometime in 1944. 
Perhaps I have a later variant. The serial number  is 321 for a model 8 TDO.
 
Best Regards,
                     Joe Cro N3IBX