[Johnson] Tube Designation

[Artmouton]

Not the one I used as a general many years ago.  It always had good sounding 
audio, at least that is what other hams would tell me.
Art K5FNQ

----- Original Message ----- 
From: "David C. Hallam" <dhallam at rapidsys.com>
To: "Langston, Mike" <MLangston at HCPRICECO.com>; "Peter Markavage" 
<manualman at juno.com>
Cc: <johnson at mailman.qth.net>
Sent: Tuesday, April 22, 2008 2:55 PM
Subject: RE: [Johnson] Tube Designation


> What about the Hallicrafters HT-37?  Since it uses an almost identical
> system, is the carrier balance as difficult to achieve and maintain with 
> it?
>
> David
> KC2JD/4
>
>> -----Original Message-----
>> From: johnson-bounces at mailman.qth.net
>> [mailto:johnson-bounces at mailman.qth.net]On Behalf Of Langston, Mike
>> Sent: Tuesday, April 22, 2008 3:04 PM
>> To: Peter Markavage
>> Cc: johnson at mailman.qth.net
>> Subject: RE: [Johnson] Tube Designation
>>
>>
>> Last time I tuned a Pacemaker was 1978. I was feeding a T-bolt and
>> remember that I couldn't depend on the Pacemaker meter for accurate
>> carrier null. I had an output meter downstream of the T-bolt and nulled
>> for minimum reading on the output meter. I don't remember what tubes
>> were in it.
>>
>> Mike KL7CD
>>
>> -----Original Message-----
>> From: johnson-bounces at mailman.qth.net
>> [mailto:johnson-bounces at mailman.qth.net] On Behalf Of Peter Markavage
>> Sent: Tuesday, April 22, 2008 12:48 PM
>> To: Johnson at mailman.qth.net
>> Subject: Re: [Johnson] Tube Designation
>>
>> I seem to remember when I had the 12AT7's in the Heath SB-10, I had to
>> constantly ride the carrier null pots with each transmission. Replacing
>> the tubes with 6201's and replacing the null pots with 10 turn devices
>> cured that problem along with the improved carrier suppression.
>>
>> Pete, wa2cwa
>> http://www.manualman.com
>>
>> On Tue, 22 Apr 2008 13:21:19 -0400 "David C. Hallam"
>> <dhallam at rapidsys.com> writes:
>> > Pete,
>> >
>> > I can't seem anything one way or the other.  Right now the Pacemaker
>> > is a
>> > work in progress.  When I am finished refurbishing maybe I will run
>> > some
>> > tests.  I can try a 12AT7, ECC-81, 6201, and any other MilSpec
>> > variants I
>> > can get my hands on and look the carrier and side band suppression
>> > on my
>> > spectrum analyzer.
>> >
>> > David
>> > KC2JD/4
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>>
>>
>>
>
>
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