[ARC5] ARC-5 Receiver Question

[Mike Morrow]

Michael wrote:

>On tubes: Early equipment was built with metal tubes while later
>SCR-274-N receivers were built with glass tubes. 

Only some of the later receivers used glass tubes.  I have several NOS
BC-453-B, BC-454-B, and BC-455-B receivers.  The tube legend under the
tube cover specifies either metal (VT-) or GT tubes for every tube except
the metal 12K8.  My receivers use anywhere from three to five glass tubes,
or all metal tubes.

For example, one W.E. Co. BC-454-B SN 130099, uses five glass tubes.  A
later W.E. Co. BC-454-B SN 140437 (and MFP date of 5/1945), uses all metal
tubes.  It looks like metal was preferred when available, and that there
was no point after which all W.E.Co. units used at least some glass tubes.

Mike / KK5F