[Hallicrafters] HT-32 Mystery Circuit

[Jim Zellmer]

Those diodes might be a modification for an (AALC) amplified automatic 
load control like the one in the HT-32B.  I seem to remember a segment 
is a old Hints & Kinks manual about this one.  I will have to rummage 
through my old books and will scan a copy if I find it.

Jim Zellmer
KA0VSL

Harry Vaught, KT4AE wrote:
> Thanks to Gary, K8BKB for identifying my problem with being unable to 
> bring the LSB oscillator into alignment - the LSB crystal.
>
> While I'm waiting for the crystal, I've been doing some miscellaneous 
> cleanup and minor recapping since there are very few non-ceramic caps 
> in the unit.  This is where the mystery comes in.
>
> In the compartment under the finals there is an added terminal strip. 
> On it are a couple of 1N33 diodes, a .47 mfd cap, 3-.1 caps and a 
> couple of resistors across the caps.  It's hooked in some subtle way 
> to the finals, but I couldn't figure it out with all the back and 
> forth.  The caps are 200 volt units so they aren't dealing with high 
> voltage.  From this circuit there are two wires running to the SSB 
> deck and are in series with the normal lead to the contact on the 
> Function switch (wafer 1R) which is selected in USB or LSB.
>
> From this limited description does anyone get a glimmer of what this 
> might be? A limiter?  ALC?  The thing doesn't act like it has either a 
> limiter or ALC.  It's easy to over-drive, as is normal with these units.
>
> I have been known to just rip mods out and have gotten away with it a 
> time or two on receivers but in this case the HT-32 works fine and "If 
> it ain't broke, don't break it."  Also, I don't want to ever have to 
> take it apart again.
>
> Harry, KT4AE
> Maryville, Tennessee
> ______________________________________________________________
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