[ARC5] BC-454-B Power

[Robert Downs]

I don't have anything on the GF or GF-2 but the GF-3 also has the later tube complement (two 89's and two 837's).

Robert Downs

-----Original Message-----
From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Michael Hanz
Sent: Tuesday, July 20, 2021 07:32
To: Hubert Miller; arc5 at mailman.qth.net
Subject: Re: [ARC5] BC-454-B Power

On 7/19/2021 11:29 PM, Hubert Miller wrote:
> Ken's comment that
> "I know that too, Brian, but the 6F6 is a much taller and fatter tube and won't fit in the radio with the covers on",
> reminded me of this: the GF transmitter has a tube cover that is raised higher than the rest of the transmitter top
> surface. It's almost like an oops, modification of an earlier design to fit the taller 837 tubes. It must have been much
> more expensive to cast this raised cover than to simply cut a flat metal sheet to cover the tube compartment.
> Anyone know the "why" ?

KK5F's groundbreaking and exhaustive review* of the early "command sets" 
shows  the earliest GF-1 had three Navy nt-38110A (AKA Type 10 tubes) 
and one nt-38142 final (45 special, AKA VT-52).  There was a shift  to a 
couple of 89s and a pair of 837s by the GF-8 and later...not sure when 
that occurred.  That perhaps explains the doghouse on the tube cover - 
it's only sheet metal on mine, not cast.

*I only have his 20 Jan 2015 version, so there may be more in later 
revisions.

        73,
  - Mike  KC4TOS