[Hallicrafters] sx101 subchassis

Tue Jan 15 10:24:35 EST 2013

Thanks all, that answers my question.  I was referencing the oldest SX-101 
for which I could find a schematic.  The purpose was to check whether they 
used paper caps under the sub chassis and if they did --- how were they able 
to make 6 paper caps fit in the confined space of the sub-chassis.

Thanks again --- Kindest regards Jim K9AXN

----------------- ORIGINAL MESSAGE -----------------------

From: rbethman
Sent: Tuesday, January 15, 2013 8:03 AM
To: hallicrafters at mailman.qth.net
Subject: Re: [Hallicrafters] sx101 subchassis

They are NOT in the SX-101 MK I either.

Bob - N0DGN
On 1/14/2013 10:09 PM, Jim Liles wrote:
> Hi Mark:
>
> Im lost in the woods somewhere!  What schematic and locations are C208, 
> C209, and C210.  Cant find them in any of the sub-chassis or radios we 
> listed.
>
> Kindest regards Jim K9AXN
>
>
>
> -----Original Message----- From: Mark K3MSB
> Sent: Monday, January 14, 2013 6:09 PM
> To: Jim Liles
> Cc: Nash4447 at cs.com ; hallicrafters at mailman.qth.net
> Subject: Re: [Hallicrafters] sx101 subchassis
>
> Hi Jim --
>
> Interesting in that my parts list shows only 3 paper caps in there -- 
> C208,
> 209, and 210.
>
> They're 600V caps and the spacing would be snug;  I never thought of that
> angle.
>
> I didn't find it difficult to remove the sub chassis,  but it's one of
> those activities I'd rather avoid if at all possible
>
> 73 Mark K3MSB
>
> On Sun, Jan 13, 2013 at 9:39 PM, Jim Liles 
> <hallicrafterssr2000 at k9axn.com>wrote:
>
>> Hi Mark, Glenn:
>>
>> The Hallicrafters schematics  of that era seemed to call things paper 
>> that
>> were Ceramic or Film caps.  Hallicrafters was not the only manufacturer
>> that grossly mislabeled components in the transition from paper to 
>> Ceramic
>> and Film caps.
>>
>> If you have ever had a sub-chassis apart, six paper caps would not have
>> fit in the confined space of the Sub-chassis.  I have had them out of the
>> Mark 1A many times and never found paper.  After finding no paper 
>> numerous
>> times, I simply test components from tube pins and edge lines and do not
>> remove unless it fails or a resistor tests out of tolerance.
>>
>> The SX-101 Mark1  calls out Ceramic 1957-58
>>
>> The SX-100 Mark1A calls out Ceramic  1956-61
>>
>> The SX-96 calls out Ceramic 1955-56
>>
>> The S76 1950-55      calls out and used paper but there are but TWO 
>> rather
>> than SIX caps in the Sub-chassis.  Look at the S76 sub-chassis and you 
>> will
>> see that two fit but six would be very very difficult.
>>
>> Never say never.  I guess there may have been some midget paper caps 
>> built
>> that might have fit but do not believe it to be so and have never heard 
>> of
>> paper caps in the sub-chassis of any but the S76.
>>
>> NOTE:  Different issue but worth attention.  The caps used on the BAND
>> WIDTH switch are called paper and were paper until later products, which
>> used Film i.e. the SX-117 and SX-115.  All should be replaced with Film
>> caps not Ceramic if you expect the filter to work properly.  The original
>> paper caps were more stable and predictable than Ceramic caps.
>>  Hallicrafters never used Ceramic caps on any of the 50Kc Band width
>> switches.  Early radios paper and later, Film --- no Ceramic.
>>
>> A super day to you Mark and Glenn, enjoy that radio.
>>
>> Kindest regards Jim K9AXN
>>
>>
>>
>> -----Original Message----- From: Mark K3MSB
>> Sent: Sunday, January 13, 2013 2:35 PM
>> To: Nash4447 at cs.com
>> Cc: hallicrafters at mailman.qth.net
>> Subject: Re: [Hallicrafters] sx101 subchassis
>>
>>
>> Hi Glenn --
>>
>> There are paper caps on some model runs.
>>
>> The parts list in my manual indicates paper caps, but when I removed the
>> subchadsis I didn't find any.  Of course, my manual was a photocopy from
>> somewhere and didn't go with the receiver.
>>
>> 73 Mark K3MSB
>>
>> On Sun, Jan 13, 2013 at 12:23 PM, <Nash4447 at cs.com> wrote:
>>
>>
>>> Just FYI since we are talking about subchassis parts.   A couple years 
>>> ago
>>> I restored a SX101 that was dead on the higher bands.  I bit the bullet
>>> and
>>> removed the subchassis and found two things - there are no paper caps
>>> under
>>> the subchassis on the 101s  BUT I found that the resistor feeding the
>>> plate
>>> voltage to 2nd osc, I think something like a 12AU7, was sky high in 
>>> value,
>>> hence little or no B+ on the tube.
>>> Replacing that  resistor  with a 1 watt variety brought things back to
>>> life.
>>>
>>> Something for the memory banks
>>>
>>>
>>> Glenn    K6PZT
>>>
>>
>>
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