[Hallicrafters] HT-44 neutralization problems

[Art Lebermann]

Steve....

How are you measuring the plate current?  Are you following the procedure
in the factory manual, with the rig connected to a 50-ohm dummy load?

73,
ART
W6REQ



> [Original Message]
> From: Steve <zarco at sonic.net>
> To: <hallicrafters at mailman.qth.net>
> Date: 1/12/2007 6:43:23 PM
> Subject: [Hallicrafters] HT-44 neutralization problems
>
> Hi Folks,
> I'm new to the group, and am very happy to find one that
> is familiar with these radios!
>
> I've been woking on restoring an SX-117 and HT-44 to use as
> a vintage station. After a lot of grief, the SX-117 is done, but
> I've still got a couple of issues left to go with the HT-44. One
> is that I've been unable to properly neutralize the finals. I am not
> seeing a dip in plate current that corresponds to max power out.
> In fact I'm not seeing any dip in plate current at all. Very strange.
>
> Some of the things I've tried;
> * use a grid dip meter to verify resonance on all bands (OK) of
>   output tank circuit
> * tried another set of finals and driver
> * replaced all bypass and coupling caps in the finals cage
> * re-capped power supply
> * verified that the neut cap is OK, and properly connected
>
> Not sure what to try next. If anyone has a working HT-44 out
> there, and are willing to pop the lid, I'd like to know how much
> of the threaded rod is sticking out of the nose of your neut
> cap. Mine is about 1/4", and the finals seem to be very stable
> with this setting (not so with others). 
>
> Any help or suggestions are greatly appreciated!
>
>                        Steve W6SSP
>
> ______________________________________________________________
> Hallicrafters mailing list
> Home: http://mailman.qth.net/mailman/listinfo/hallicrafters
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:Hallicrafters at mailman.qth.net
> ----
> List Administrator: Duane Fischer, W8DBF **for assistance**
> dfischer at usol.com
> ----
> Hallicrafters Collectors International: http://www.w9wze.org