[Heathkit] [Heath] 6146B Issues
manualman at juno.com
manualman at juno.com
Mon Oct 14 03:33:26 EDT 2013
I've never run across any of the rigs that I've owned over the last 50
years where 6146B's would not work in place of 6146's and A's and that
includes Heathkit (my original Apache has been running 6146B's since the
70's), Hallicrafters, B&W, Johnson, Kenwood, and others. I won't refute
Glen's original findings (obviously he had a problem with them back then)
but for anyone to say they won't work in all rigs as a replacement is
highly exaggerated.
Pete, wa2cwa
On Sun, 13 Oct 2013 20:25:06 -0700 "Chris Kepus" <ckepus at comcast.net>
writes:
> Glen,
>
>
>
> Your article on the 6146 family is very informative and helpful.
> However,
> it begs the question..what to do with all those 6146B/8298A's?
>
>
>
> Your article stated that Collins "figured it out" for the later S
> line
> transmitters (amazing what necessity fosters).
>
>
>
> I wonder if anyone has compared the Collins neutralization circuitry
> for the
> early transmitters to the latter ones? Could the later S-line
> approach
> (whatever it is) work with other 2X 6146 rigs so that they would be
> "happy"
> with the B's?
>
>
>
> Are there any other known 2X 6146 rigs that can run B's without
> problems?
>
>
>
> Glen.anyone?
>
>
>
> 73,
>
> Chris
>
> W7JPG
>
>
>
>
>
>
>
> From: Heath [mailto:heath-bounces at puck.nether.net] On Behalf Of Glen
> Zook
> Sent: Saturday, October 12, 2013 9:26 AM
> To: RAY FRIESS; Gary H. Harmon, Jr.; heath at puck.nether.net;
> Heathkit2;
> Heathkit3 LIST
> Subject: Re: [Heath] [Heathkit] 6146B Issues
>
>
>
> The DX-35, DX-40, and the DX-60 series "load down" the grid circuit.
> This,
> in turn, requires considerably higher output from the driver stage.
> As
> such, Heath did not neutralize those transmitters. With the "loaded
> down"
> grid, the 6146 in the final amplifier is much less likely to "take
> off" and
> neutralization is not usually required. In most cases, the
> 6146B/8298A or
> 6146W tubes will work fine.
>
>
>
> Of course, there are always exceptions. As such, I will not say
> that the
> later tubes will work in every DX-35, DX-40, and DX-60 series.
> However,
> there is a very good chance that the tubes will work fine.
>
>
>
> Glen, K9STH
>
>
>
> Website: http://k9sth.com
>
>
>
> On Saturday, October 12, 2013 10:48 AM, RAY FRIESS
> <rayfrijr at msn.com> wrote:
>
> Glen ... question.
> Does this apply as well to the simple Heathkits like the DX 40 and
> DX 60?
> I don't recall off hand that those simple ones require or even have
> provision for neutralizing.
>
> Ray wa7itz
>
> _____
>
>
>
>
>
> Date: Fri, 11 Oct 2013 18:46:40 -0700
> From: gzook at yahoo.com
> To: gharmon at idworld.net; heath at puck.nether.net;
> heathkit at mailman.qth.net;
> heathkit at yahoogroups.com
> Subject: Re: [Heath] [Heathkit] 6146B Issues
>
> There is no list. However, the 6146B/8298A and the 6146W tubes
> require
> different neutralization and most of the Heath SB-Line equipment are
> very
> "iffy" in whether or not they can neutralize. Some units seem to
> work OK
> but even more have problems. One can modify the neutralization
> circuit so
> that the transmitters / transceivers will neutralize. However, for
> "plug
> and play", one really needs to use the 6146, 6146A/8298, or 6293
> tubes,
> especially if they have problems neutralizing the tubes.
>
>
>
> There are those who violently disagree with my article on the 6146
> family of
> tubes:
>
>
>
> http://k9sth.com/uploads/The_6146_Family_of_Tubes_1.pdf
>
>
>
> However, over the years, I have literally seen well over 10,000
> transmitters
> that use the various 6146 family of tubes and my observations are
> outlined
> in the article.
>
>
>
> There are those who say that they have used the 6146B/8298A or 6146W
> in
> transmitters that were designed for the 6146 or 6146A/8298 without
> any
> problems. I do believe them. However, I have received notice from
> a LOT
> more people who say that they have had problems and went back to the
> earlier
> tubes. It seems to be how the individual tolerances of the
> components "add
> up" as to whether or not the later tubes work.
>
>
>
> I have worked on individual transmitters, of exactly the same model,
> with
> serial numbers within 10 of each other. With those transmitters 1
> was happy
> with the 6146B/8298A and the other 2 were very unhappy.
>
>
>
> Glen, K9STH
>
>
>
> Website: http://k9sth.com
>
>
>
> On Friday, October 11, 2013 5:13 PM, "Gary H. Harmon, Jr."
> <gharmon at idworld.net> wrote:
>
> I seem to remember there are some pieces of Heathkit that are not
> HAPPY-HAPPY-HAPPY with 6146B tubes. Is this a myth or is there a
> list of
> pieces that prefer to not see a 6146B?
>
>
>
> Thanks and 73,
>
>
>
> Gary H. Harmon, Jr. - K5JWK
>
> 6003 Archwood
>
> San Antonio, TX 78239-1504
>
> 210.657.1549h / 210.884.6926c/t
>
>
>
> "Retirement means every day is a Saturday except Sunday"
>
> http://www.grissomroadcoc.org <http://www.grissomroadcoc.org/>
>
>
>
>
>
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