[Johnson] Tube Designation

[James M. Walker]

Time to weigh in here,
I acquired the HT-37, a pair of Pacemakers. W/ Thunderbolts, and I
also have TX-1 (Apaches), w/SB-10 SSB adapter, and even a DX-100B
with the additional SB-10. Never had any problem with the suppression
or tune-up. Signal reports on air on all modes, were/are complimentary
no complaints, with statements like "Sounds like one of the new solid state 
rigs".

Never any problems with carrier suppression, drive levels to the amps,
in the case of the Heathkit gear the amplifiers are a pair of HA-10
Warriors. Course as always YMMV, FWIW!

Jim
WB2FCN
eshop1.chem.buffalo.edu


----- Original Message ----- 
From: "Artmouton" <k5fnq at cox.net>
To: <dhallam at rapidsys.com>; "Langston, Mike" <MLangston at HCPRICECO.com>; 
"Peter Markavage" <manualman at juno.com>
Cc: <johnson at mailman.qth.net>
Sent: Tuesday, April 22, 2008 7:35 PM
Subject: Re: [Johnson] Tube Designation


> 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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>
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