[Heathkit] Heathkit Digest, Vol 107, Issue 10

Thu Dec 13 13:00:53 EST 2012

Glen,
You are virtual mine of information.
Boy have you been around.
I derive great pleasure in reading your posts on the various reflector
sites.
If there was a Ham Hall of Fame for contributors I sure would nominate you.
Thanks for all the information you provide.
Long may you prosper.
Happy Christmas.
Jim
Ei2BB

On 13 December 2012 17:00, <heathkit-request at mailman.qth.net> wrote:

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> Today's Topics:
>
>    1. info needed CM-1050 (Michael Tortorella)
>    2. Replacing the 6AU6 with a 6AH6 in the Heath VF-1 VFO (Glen Zook)
>    3. HR-10B question (Alexander N. Gerli)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 12 Dec 2012 22:09:51 -0500
> From: "Michael Tortorella" <w2iy at verizon.net>
> To: <heathkit at mailman.qth.net>
> Subject: [Heathkit] info needed CM-1050
> Message-ID: <9212111D8A364C4CB6FC0097C92A5262 at OfficeDesktop>
> Content-Type: text/plain;       charset="US-ASCII"
>
> Hi all, am looking for operating information for the CM-1050 automotive
> analyzer.  I thought I had a manual somewhere but I seem to have lost it.
> Any help appreciated.
>
> Thanks and 73
>
> Mike W2IY
>
>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 13 Dec 2012 08:19:16 -0800 (PST)
> From: Glen Zook <gzook at yahoo.com>
> To: h <heathkit at mailman.qth.net>
> Subject: [Heathkit] Replacing the 6AU6 with a 6AH6 in the Heath VF-1
>         VFO
> Message-ID:
>         <1355415556.41622.YahooMailNeo at web160105.mail.bf1.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> Recently, I have been asked as to how I came up with the idea to replace
> the 6AU6 in the Heath VF-1 VFO with a 6AH6 and for the other changes I
> recommend which are to replace the 0A2 screen voltage regulator with an 0B2
> and run the VFO from a regulated 150 VDC source. ?As such, I thought that
> others might be interested in this. ?The following is the answer that I
> gave:
>
> The idea for replacing the 6AU6 in the Heath VF-1 actually came from the
> Heath Company. ?The very first TX-1 Apache transmitters used the 6AU6 in
> the VFO. ?However, the stability was just not satisfactory for use with the
> SB-10 SSB adapter. ?After some experimentation, it was found that when the
> 6AH6 was used in the VFO without any changes to the circuitry, the
> stability improved immensely and the only difference was that the trimmer
> capacitors for calibration on each band had to be adjusted slightly to
> compensate for the difference in inter-electrode capacitance.
>
> Since the tube is not operated anywhere near its limits, the fact that the
> maximum plate dissipation is slightly different does not enter into the
> equation.
>
> I grew up 35 miles from the Heath plant (LaPorte, Indiana) in St. Joseph,
> Michigan. ?The mailing address was Benton Harbor but the actual location of
> the plant was on Hilltop Road in St. Joseph. ?After getting my driver's
> license, I would occasionally drive up to the Heath plant just to "drool"
> over the latest equipment. ?Heath had a display room, where one could
> actually purchase and take home equipment, that was located to the left as
> one entered the main entrance to the plant. ?If you had any questions about
> any equipment, the person at the order desk would call back into the plant
> and someone, often the lead engineer on the kit design, would come out and
> answer your questions.
>
> The engineer would often suggest changes to the equipment to improve the
> operation and, usually, hand you a paper bag with some parts and a
> schematic, sometimes "hand drawn". ?There was never a charge for this. ?One
> time, I had a question about frequency stability on my DX-100 transmitter
> and the engineer suggested replacing the 6AU6 with a 6AH6 and changing the
> screen regulator to an 0B2 instead of the 0A2. ?He also commented that this
> worked great on the VF-1. ?Although he didn't comment on using regulated
> 150 volts for a separate power supply for the VF-1, I tried that, using the
> 0A2 removed from the screen of the tube to regulate the external power
> supply. ?That improved the stability even more.
>
> Ever since then, I have recommended changing the VF-1 tubes to a 6AH6 and
> OB2.
>
> I never knew the name of the particular engineer who suggested the
> changes. ?However, if I remember correctly, he had been involved with the
> design of the TX-1 Apache as well as the DX-100 and VF-1.
>
> There were a number of Heath employees that were amateur radio operators
> who were very active. ?I used to work them on 6-meter and 2-meter AM.
>
> ?
> Glen, K9STH
>
>
> Website: http://k9sth.com
>
> ------------------------------
>
> Message: 3
> Date: Thu, 13 Dec 2012 11:28:37 -0500
> From: "Alexander N. Gerli" <ac1wye at gmail.com>
> To: <heath at puck.nether.net>,    <heathkit at mailman.qth.net>
> Subject: [Heathkit] HR-10B question
> Message-ID: <004b01cdd94e$e8b820b0$ba286210$@com>
> Content-Type: text/plain;       charset="us-ascii"
>
> Hi, gang!
>
> Well, my ol' HR-10B seems to be working pretty well, although I haven't
> realigned it yet. So far, the BFO is smack on, the calibrator is accurate,
> and I'm listening to the AM guys on 7290. Good sigs.
>
> Only problem so far is that the S-meter doesn't register. The meter works
> as
> the movement operates when I back off the RF gain. And the meter zero
> adjustment works as it should.
>
> I'm waiting for a manual copy to arrive in the mail, so I don't want to
> mess
> with the front-end and interstage coils until I get into the complete
> alignment procedure.
>
> Does anyone on the list have any thoughts about how well the S-meter
> typically works?
>
> 73,
>
> Sandy AC1Y
>
> Alexander N. (Sandy) Gerli
> 'Corgi Cottage'
> 548 Allred Mill Road
> Mount Airy, NC 27030-2202
> 919-625-7181
>
> A Scotsman walks about 900 miles each year
> Scotsmen drink about 40 gallons of whisky each year
> Scotsmen get about 25 miles per gallon
>
>
>
>
> ------------------------------
>
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> End of Heathkit Digest, Vol 107, Issue 10
> *****************************************
>