HW-100 Vs 101

[R. L. Blaney]

Hi, all you Heathers,
I have never owned a HW-100, but have seen and used several over the years.
If we can beleive the 1969 Heath catalog in front of me now, which states,
"And the HW-100 is the only rig that uses a Field Effect Transistor (FET) in
the VFO for superior thermal stability." the HW-100 evidently used a
Junction field effect transistor, (JFET), as the VFO, which was then
followed by a 6AU6  tube as a buffer.  Checking my schematic for the HW-101,
that is the same line-up as described in the 1969 catalog.  In the '101, the
transistor is labled Q-941, and the 6AU6 is V-20, and I assume, those
probably are the same designations as in the '100.  What I do recall, was
the hard time I always had trying to align the VFO, with those 2 trimmers,
buried down on the left side of the VFO, with no room to get a tuning stick
or screwdriver straight in to them.  Oh, well, once you got'em right, they
sure did work.  You are right about the pre-assembled VFOs in the SB-401,
 like mine here now), has a tube type VFO.  I believe the HW-100 was the
first Heath xmitter or xceiver to use a transistorized VFO.  Maybe someone
else can supply more info.  73 es gud hamming, de
Dick, WB8MHE
wb8mhe at bright.net

-----Original Message-----
From: Mike Souhrada <wb9iog at revealed.net>
To: HEATH at LISTSERV.TEMPE.GOV <HEATH at LISTSERV.TEMPE.GOV>
Date: Friday, July 24, 1998 12:48 PM
Subject: Re: HW-100 Vs 101


>Bill Coleman AA4LR wrote:
>>
>> On 7/24/98 12:05, R. L. Blaney at wb8mhe at BRIGHT.NET wrote:
>>
>  Also, the '101 had different styling on
>> >the front panel, painted to look more like the SB-300, (or Collins "S"
>> >line), in the area around the tuning dial, and had a dark strip along
the
>> >lower portion of the front panel.
>>
>No dark stripe on mine or the other three I've had.
>
>> Didn't the HW-101 have a transistorized VFO, while the HW-100 was
>> tube-type, or am I thinking of another radio entirely?
>
>No it was a 6AU6 tube. Those that had  LMO pre manufactured
>also used a tube as I recall (SB 401 ).That was my first big kit.
>
>
>Mike
>Le Claire, Ia
>
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