[Hallicrafters] My First Boat Anchor Restoration: SX101 MkIII

[Jason Hissong]

I was reading something about the 12BY7 going bad after a while.
Maybe I will put a power strip in and turn it off at the source to
save the tube.  I am wondering if that tube is the problem itself.

I will check tonight and see if the tube is even working.

Thanks again guys!

Jason N8XE

On Mon, Nov 14, 2011 at 2:11 PM, Mike Everette <radiocompass at yahoo.com> wrote:
> Jason,
>
> Something else you might check... take a look at the tubes and make sure the correct tubes are in the sockets!
>
> I experienced this with an sx-100 a number of years ago... brought it up pn a variac, and no signals except a few in the 12-34 mc band.  Noise on the others except for the AM BCB which was stone dead.
>
> Guess what... the first mixer tube had been replaced, probably by the seller to fill an empty socket before taking it to the hamfest.  The tube was a 6AG5, instead of (I think) a 6BA6.  Don't ask me how the thing was working on band 4 (12-34 mc) because the basing of these tubes is totally different except for the filament pins.  I put the right tube in, and WHOOOOOOOMMMMM -- here came the signals!
>
> You should clean all the tube and socket pins, preferably with De-Oxit.
>
> The "always on" oscillator filament feature means you'll be replacing tubes every few months.  Otherwise, you'll surely like the 101 Mark III.  I think it is the best of the 101 series.
>
> If they just weren't so heavy...!
>
> 73
>
> Mike
> W4DSE
>
>
>
>
> --- On Mon, 11/14/11, Ross Stenberg <k9cox at charter.net> wrote:
>
>> From: Ross Stenberg <k9cox at charter.net>
>> Subject: Re: [Hallicrafters] My First Boat Anchor Restoration: SX101 MkIII
>> To: hallicrafters at mailman.qth.net
>> Date: Monday, November 14, 2011, 1:17 PM
>> 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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