[ARC5] VFO provenance

[Sandy]

Back during the "10B/20A" days.....remember the grounded grid amp fad? 
There was 4-8: 5763's, 4: 6AG7's, 4: 837's, "modified" 1625's (some 
manufacturer brought beam forming plates in some surplus 1625's out of the 
bulb "press" via a lead and connected it to the cathode.  Some hams cut a 
hole in the side of the base and disconnected the beam forming plates from 
cathode and reconnected to one of the grid leads)  Eventually my 10B drove 
four 5763's which in turn drove a triad of G-G 811A's.  It comfortably 
delivered around 350 watts which was a big boost from the four 5763's on 40 
and 75 SSB!

73,

Sandy W5TVW

-----Original Message----- 
From: Bill Fuqua
Sent: Wednesday, February 01, 2012 11:51 AM
To: arc5 at mailman.qth.net
Subject: Re: [ARC5] VFO provenance

  He clearly states that it is just a VFO in the description. I think he
provided lots of stuff in the
title to catch searches for 20A Central Electronics or Ham Transmitter.
   I started out with a 10A driving a pair of 6146Bs and then went to a 10B
and then a
20A in my first round with ham radio, I got back into it when my 10 year
old son became interested.
I had only one coil set for the 10A so I  removed the power lamp and the
front panel 1/4 inch plug
and mounted 2 rotary switches. Added tapped coils and band switched it. It
was not real efficient but
it did produce a bit over 1 Watt on all bands which still drove my 6146Bs
just fine.
    I experimented with 4 grounded grid 6AG7 as well and  could drive them
to some ridiculous power
as well.
    Later I went to a pair of 4CX250Bs a year or so before being drafted.
73
Bill wa4lav



At 12:30 PM 2/1/2012 -0500, Sandy wrote:
>Central Electronics, at one time, sold a conversion kit for the BC-458
>"command transmitter" to convert it into a VFO for the model 10A, 10B or 
>20A
>exciters.  They included the plastic dial plate shown as well as some parts
>necessary for the modification.  For an additional $20 I recall, they
>included a very nicely painted/silk screened cabinet to enclose the BC-458
>that matched the Central Electronics exciters at that time.
>
>The guy who owned this one originally did this one "on the cheap" and 
>didn't
>buy the external cabinet!
>
>I had a 10B and a "458 VFO" as my first real SSB transmitter when I was
>going to high school.  I bought it with money I earned building Heathkits
>for the local hams in New Orleans.  Originally used it with a second hand
>National NC-=125 receiver I bought a couple of years earlier.  Yes the
>receiver DID drift on SSB and so did the BC-458!  I remember buying a
>spanking brand new BC-458 for around $5 as they didn't cover a ham band and
>were VERY plentiful at the time.  (Late 1950's)
>
>The "fib" in the ebay ad is the statement about the 20A transmitter.  This
>is just the VFO for it!    The guy probably doesn't really know what he
>actually has, a "5 mhz VFO for the 20A, probably LESS the additional
>converter needed for 15 and 10 meter operation as well!
>
>73,
>
>Sandy W5TVW
>
>-----Original Message-----
>From: Laura and Jim
>Sent: Tuesday, January 31, 2012 11:04 PM
>To: arc5 at mailman.qth.net
>Subject: [ARC5] VFO provenance
>
>Guess what this used to be..........
>
>http://www.ebay.com/itm/Central-Electronics-458-VFO-Ham-Radio-Transmitter-Central-Electronics-20A-/160726005891?pt=LH_DefaultDomain_0&hash=item256c043883
>
>Don't think Central Electronics used Dymo Labels...........
>
>73 DE JIM K6FWT
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Checked by AVG - www.avg.com
Version: 2012.0.1913 / Virus Database: 2109/4779 - Release Date: 02/01/12