[Hammarlund] SP-600-25C

[Bill Cromwell]

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.
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-- 
bark less - wag more