[Boatanchors] 6146 A or B ?

[Carl]

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
----- Original Message ----- 
From: "Drew P." <drewrailleur807 at yahoo.com>
To: <boatanchors at mailman.qth.net>
Sent: Wednesday, December 23, 2009 12:29 AM
Subject: Re: [Boatanchors] 6146 A or B ?


> Carl and Glen:
>
> Thank you for your insights on the "FADF2" and instability problems caused 
> by its indiscriminate use.
>
> Carl mentioned near-uniformity of most 6146 and 6146a, but large 
> differences in 6146B.  The 6146/6146A was a product of the early 50's, 
> while the 6146B was a dozen or so years newer, as per some other writings 
> by Glen.
>
> My conjecture: Perhaps the differences in 6146B accrue to the end of the 
> tube era rapidly approaching at that time, and the manufacturers setting 
> their sights on the next wave, thereby giving tubes only modest attention, 
> knowing that in a few short years it wouldn't matter anyway.
>
> Drew
>
>
>
>
>
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