[Hammarlund] New to Hammarlunds

[Richard Knoppow]

----- Original Message ----- 
From: "Bill Cromwell" <wrcromwell at gmail.com>
To: <hammarlund at mailman.qth.net>
Sent: Saturday, April 09, 2011 4:03 PM
Subject: Re: [Hammarlund] New to Hammarlunds


> Hi Mitch,
>
> I no longer have it but I used a Hammarlund HQ-145X and 
> when I got it
> there was so much drift that it was useless! I swapped in 
> a different
> 6C4 oscillator tune and the drift problem went away. I 
> tested the tube
> in my tube tester and it checked out ok. I happened to 
> have several 6C4
> tubes and I found one with no noticeable drift after a 
> short warmup.
>
> After that I was able to use the receiver on MARS traffic 
> nets and not
> have to touch it after I netted the NCS. I wish I still 
> had my
> Hammarlund. Good luck with yours.
>
> 73,
>
> Bill  KU8H

    There is a lot a about a tube a tube tester won't tell 
you. Some testers have gas tests which helps a bit but tubes 
that check bad will often work in some circuits and tubes 
that won't work often test OK. You really have to substitute 
to be sure.
    In some cases the tube characteristis were pushed just a 
bit by the designer so one has to select tubes. That's not 
easy these days because the supply is dwindling.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com