[Hallicrafters] sx101 subchassis

[Mark K3MSB]

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
>>
>
>