[Boatanchors] 6146 A or B ?

[D C *Mac* Macdonald]

I know that National recommended the use of Sylvania tubes
where possible.  My experience indicated that National had
the right idea there.
 
Their note to me was in the days of the NCX-3 and original
NCX-5 (I owned both simultaneously) especially concerning
the 6GJ5 P.A. tubes in those rigs.
 
I'm at work and don't have the letter, but suspect that Carl's
signature was on that one.
 
73 - Mac, K2GKK/5
(Since 30 Nov 53)
Oklahoma City, OK



> From: km1h at jeremy.mv.com
> To: drewrailleur807 at yahoo.com; boatanchors at mailman.qth.net
> Date: Wed, 23 Dec 2009 09:29:26 -0500
> Subject: Re: [Boatanchors] 6146 A or B ?
> 
> I suspect some of the large commercial users had a lot to do with the 6146B 
> differences. They wanted a tube that worked with their current design using 
> the older versions. So GE, RCA, Sylvania, etc obliged with internal tweaks 
> and sometimes an OEM part #. This naturally gave them a captive audience to 
> single brand radio shops. I was told this by a long time independent service 
> shop owner who used to get regular visits from the various tube reps along 
> with info on what worked where.
> 
> Ive no idea how the ham manufacturers worked with the manufacturers on 
> 6146's. National started with RCA then went 100% with Sylvania on the 6JB6 
> sweep tubes. I believe Drake went strictly Sylvania also as that was what I 
> used to receive from them into the 80's for my two C Line rigs and TR6.
> 
> Reading some extensive history of RCA's tactics in the early days its easy 
> to see why they were despised by many.
> 
> Carl
> KM1H