[time-nuts] Anyone (ideally in the UK) got a spare rotary knob for the 5370B TI counter?

Bob Stewart bob at evoria.net
Fri Dec 30 21:03:24 EST 2016

If you can touch the heat sink for 2 seconds, you're made of sterner stuff than I am!  They run very hot.  It's a good idea to get a GPIB extender so your GPIB cable can clear the heat sink.  Somebody, can't remember who, worked up a nice looking conversion to a pair of switching supplies.  I bought a couple of the supplies from ebay, but that project hasn't shuffled to the top of the list, yet.  Maybe the next time I forget and reach back there and get burned...


      From: Dr. David Kirkby - Kirkby Microwave Ltd <drkirkby at kirkbymicrowave.co.uk>
 To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
 Sent: Friday, December 30, 2016 5:58 PM
 Subject: [time-nuts] Anyone (ideally in the UK) got a spare rotary knob for the 5370B TI counter?
I bought a 5370B TI counter which arrived today. It needs a bit of TLC, but 
nothing too bad. But one of the rotary knobs is incomplete. Does anyone have a 
spare knob? Contact me off list if you do.

I had one of these things about 10 years ago. I have forgotten how to drive it.

It is running very warm. I can hold my fingers on the heatsink for only a couple 
of seconds - not a very scientific test I must admit.

Obviously the mains voltage varies a bit, but it is usually well over the 230 
VAC we are supposed to be. I just measured it at 248 VAC. Unfortunately I'm 
right on top of the 11 kV transformer, so other properties around me probably 
get poorer voltage regulation, but a few less volts.


Dr. David Kirkby Ph.D CEng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT, UK.
Registered in England and Wales, company number 08914892.
Tel: 07910 441670 / +44 7910 441670 (0900 to 2100 GMT only please)

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