[Hallicrafters] My First Boat Anchor Restoration: SX101 MkIII

[Jason Hissong]

Thanks for the tips guys.  So it appears the L.O. is a good candidate
to start investigating.  I will check the fuse and the rest of the
circuit and see what I can find out.

Jason N8XE

On Mon, Nov 14, 2011 at 1:35 PM, rbethman <rbethman at comcast.net> wrote:
> This is "part" of the circuit that keeps the LO on all the time while
> plugged in, even when turned off.
>
> So even if that fuse is good, and the Damp Chaser is warm, check the LO
> circuit to ensure its tube is showing the filament lit when plugged in.
>
> Bob - N0DGN
>
> On 11/14/2011 1:17 PM, Ross Stenberg wrote:
>> Could be the LO is not on due to a resistive heating device (I forget
>> what they are called) being open. I had it happen to me once and
>> replaced it with a resistor and it came back to life.
>>
>> On 11/14/2011 10:20 AM, Jason Hissong wrote:
>>> Hi guys,
>>>
>>> I am new to using and hopefully restoring old radios.  I have grown
>>> particularly fond of Hallicrafters gear since I got my HT37 at Dayton
>>> a few years back.  Well, I picked up an SX101 Mk III at Dayton this
>>> past year.
>>>
>>> When I opened it up, it appears that someone already went in and
>>> replaced the caps with Olsen type "TV" Capacitors.  It also appears a
>>> few caps were added to the capacitor can in the power supply.  I was
>>> told by local hams to replace the Olsen caps so I plan to do this.
>>>
>>> The unit is in great cosmetic condition.  When I fire it up, there is
>>> no hum whatsoever.  All the features appear to work, selectivity,
>>> volume, notch, mode switch, audio etc.  However, I hear barely
>>> anything coming out of the receiver with the RF gain all the way up.
>>> I went in a cleaned up the band switch contacts and that improved
>>> things somewhat.  I can hear signals, however, the frequency does not
>>> change when I turn the VFO knob. The volume changes (i.e, the receiver
>>> appears to get less sensitive as I move away from a particular
>>> frequency).  This only happens when the Calibrator is engaged (which I
>>> picked up after I got the radio).  With the calibrator off, I hear
>>> nothing.
>>>
>>> I went ahead and ordered a cap replacement kit for it from Hayseed.  I
>>> am hoping there are some bad caps in there.
>>>
>>> Any tips or a general idea what may be going wrong would be
>>> appreciated.  This will be my first boat anchor project.  I do have
>>> experience building kits (I have build a few K2s, KX1, etc)
>>>
>>> Thanks es 73,
>>> Jason N8XE
>>>
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>
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