[time-nuts] Achieving maximum performance when driving 5370A/Binputs
Rex
rexa at sonic.net
Sun Feb 28 22:40:04 UTC 2010
Don Latham wrote:
> I've fixed shafts like this carefully with plastic swizzle sticks and
> super glue. Did I say carefully? a little dab'll do ya...
> Don
>
It is a tricky business. The 5370A I got a while back, had what was left
of the shaft glued into the bushing by an earlier repair attempt. The
shaft plastic is not one that fuses easily (polyethylene maybe). I
managed to repair mine, but the process I used took many hours and I
wouldn't recommend it. I removed the pot and was able to disassemble it.
I then drilled a very small hole down the center axis of the shaft and
used a section of very small screw rod to reinforce the joint. That
combined with glue has held up so far. For the repair, I made a tool to
align the drill to the shaft. The pot is not intended to come apart and
is small. An evil job.
I thought the 5370B had gone to a steel-shaft version of these pots.
Maybe it depends on vintage.
> ----- Original Message ----- From: "Mark Sims" <holrum at hotmail.com>
> To: <time-nuts at febo.com>
> Sent: Saturday, February 27, 2010 10:10 PM
> Subject: [time-nuts] Achieving maximum performance when driving
> 5370A/Binputs
>
>
>>
>> If it's the one that I think it is... look closely at the photo.
>> The shafts on two of the pots are sheared off at the panel. These
>> are the display update control and the external arming level
>> control. These were custom HP pots with a funky (and delicate)
>> switch. They had brittle plastic shafts. Gee, how do I know
>> this... could it be that a large percentage of the 5370's for sale
>> have the same defect?
>>
>> Luckily those controls are not too critical for normal operation.
>> They can be replaced with regular (switchless) pots if you jumper the
>> switch pads correctly. Be careful, there were two different layouts
>> to those controls.
>>
>>
>> ----------------------
>> So exactly how did you know that I bought a (cheap) 5370B a few hours
>> ago on the e-place
>
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