[Boatanchors] Hammarlund HQ-170A vs. National NC-300

[K0DAN]

If I'm not mistaken, Lafayette got their tubes from Heath.

73

K0DAN

----- Original Message ----- 
From: <kim.herron at sbcglobal.net>
To: <boatanchors at mailman.qth.net>; "Peter Markavage" <manualman at juno.com>
Sent: Tuesday, July 15, 2008 10:06 PM
Subject: Re: [Boatanchors] Hammarlund HQ-170A vs. National NC-300


> Hi Pete!!
> 
>    We both know that Lafayette bought tubes from major manufacturers.
> ----- Original Message ----- 
> From: "Peter Markavage" <manualman at juno.com>
> To: <boatanchors at mailman.qth.net>
> Sent: Tuesday, July 15, 2008 10:56 PM
> Subject: Re: [Boatanchors] Hammarlund HQ-170A vs. National NC-300
> 
> 
>>I use only Lafayette tubes in my radios.
>>
>> Pete, wa2cwa
>>
>> On Tue, 15 Jul 2008 22:13:50 -0400 <kim.herron at sbcglobal.net> writes:
>>> Hi Carl,
>>>     Yes, you do need to pay attention to the 6C4 tube.  It is a
>>> problem
>>> if that tube doesn't perform.  It needs to be a Sylvania, GE or RCA.
>>>  If
>>> you do that, you're in like Flynn.  Second tier supplier tubes DO
>>> NOT
>>> WORK, PERIOD!!!.  Can you say drifty???
>>>
>>> Kim  W8ZV
>>> ----- Original Message ----- 
>>> From: "Carl" <km1h at jeremy.mv.com>
>>> To: "Bob Young" <youngbob53 at msn.com>; <boatanchors at mailman.qth.net>
>>> Sent: Tuesday, July 15, 2008 6:26 PM
>>> Subject: Re: [Boatanchors] Hammarlund HQ-170A vs. National NC-300
>>>
>>>
>>> > Over on another forum many of the later HQ owners complain about
>>> > having to select a 6C4 that either doesnt continuously drift or
>>> quit
>>> > working at the lower end of the top end band. Then the life is
>>> rather
>>> > short.
>>> > Sounds like a design problem across many models.
>>> >
>>> > National made several changes in the NC-300 and there was also a
>>> > factory alignment glitch in the early ones. With the second
>>> conversion
>>> > oscillator switch to xtal control (every 300 that came in for
>>> service
>>> > had that done automatically) drift was almost nil after a short
>>> > warmup.
>>> >
>>> > I used the 300 primarily as an IF for 50 thru 1296 converters in
>>> the
>>> > early to mid 60's when AM was still more popular than SSB on those
>>>
>>> > bands. I believe I paid $100 for it and the speaker.
>>> >
>>> > My own TX gear was AM/SSB and CW and mostly homebrew with a
>>> converted
>>> > NCL-2000 on 6 (which I still use) and a pair of  4CX250B's on 144,
>>> 220
>>> > and 432 with a common PS and PP 811A's modulator. The NCL ran as
>>> an AM
>>> > linear at ~ 400W out and the other amps were switchable from Class
>>> C
>>> > to AB2.
>>> >
>>> > The NC-300 lasted for about 3 years and was replaced by a 75A4
>>> with a
>>> > Collins NB when SSB really caught on and QRM was often intense. I
>>> used
>>> > 10M for the IF and not Nationals converter band.
>>>
>>> > Those were fun days.
>>> >
>>> > Carl
>>> > KM1H
>> _______________________________________________ 
> 
> _______________________________________________
>