[Hammarlund] SP-600-25C

[D C _Mac_ Macdonald]

My HQ-145X was also stable enough for use
on 10 and 15 meter SSB.  I added the NCX-3 AGC and product detector circuitry.  I sold or traded it just before I headed for a USAF tour in Germany.

I wish I still had it.

73 de Mac, K2GKK/5 in OKC, OK

Sent from my iPhone

On Jan 22, 2017, at 20:29, Bill Cromwell <wrcromwell at gmail.com> wrote:

Hi Russ,

Once upon a time I had a Hammarlund HQ-145X. When I first got it I thought of it as my HF band scanner because it drifted so much. I was able to pinpoint the HFO with it's 6C5 as the drifty unit. I did just about what you did. I ran some 6C4 tubes over my tube checker and they all checked good - including the one from the HQ-145X. Some of the tubes drifted a lot and some didn't. I set the good ones aside and wasted the others. After that the receiver held it's frequency well enough to use it in Navy-Marine Corps MARS traffic nets. Those folks were kind of fussy. I wonder what ever happened to them.

73,

Bill  KU8H

> On 01/22/2017 08:43 PM, wb3fau55 at neo.rr.com wrote:
> So, ongoing issues,  but it looks like I fixed it.  Putting the 600 on lime in my shack, it developed a real bad drift problem.  As I had taken apart  the RF deck, I found vitamin Q caps installed here.  I did not change these.  Just  touching  the 6C4 HF osc tube,  caused more drift.  I shut it down,  pulled the 6C4,  sprayed D5 in the tube socket,  sucked it out  with a shop vac.  I installed a new 6C4 and an IERC black tube shield.  Ran it  all day,  seems just fine now.  I have found  problems  before with 6C4s.  Comments and experiences appreciated.  73s Russ.
> ______________________________________________________________
> Hammarlund mailing list
> Home: http://mailman.qth.net/mailman/listinfo/hammarlund
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Hammarlund at mailman.qth.net
> 
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
> 
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

-- 
bark less - wag more

______________________________________________________________
Hammarlund mailing list
Home: http://mailman.qth.net/mailman/listinfo/hammarlund
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Hammarlund at mailman.qth.net

List Administrator: Duane Fischer, W8DBF
** For Assistance: dfischer at usol.com **


This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html