Author Topic: EEVblog #265 - Philips PM6672 Timer Counter Teardown  (Read 3900 times)

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Offline quantumfall

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EEVblog #265 - Philips PM6672 Timer Counter Teardown
« on: April 05, 2012, 07:06:46 pm »
Just the sort of gear I'd like to get from the bay not that I need it its just so nice to own and affordable sometimes.  I would like an old tek scope as well just for the sheer build quality.

Philips made a lot of nice equipment in the years gone by,  are you going to give us a look at it in action ?

I've got an 1960's vintage counter timer with nixie tubes it has a crystal oven with a crystal in a glass envelope not dissimilar to the one in the philips, but its just in an alloy case with a mechanical thermostat and a small filament lamp as a heater.

Nice Dave looking forward to the next installment. schematic almost like Dave CAD.
« Last Edit: April 05, 2012, 07:10:54 pm by quantumfall »
 

Offline Rufus

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Re: EEVblog #265 - Philips PM6672 Timer Counter Teardown
« Reply #1 on: April 05, 2012, 08:49:55 pm »
I have a PM6672/03 same as the teardown with the next cheaper  OCXO.

Found a copy of the order for it from 1983

GBP 775 + GBP 181 for the OCXO option.

The radio switch contacts needed cleaning a couple of times and the unusual furry plastic coating on the case covers kinda disintegrated. I snuck them in with a powder coating job a few years ago. Otherwise it still works fine.
 

Offline quantumfall

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Re: EEVblog #265 - Philips PM6672 Timer Counter Teardown
« Reply #2 on: April 05, 2012, 09:51:37 pm »
"The radio switch contacts" I almost thort what you on about,  but then it became clear grass hopper. slide switches.
 

Offline baljemmett

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Re: EEVblog #265 - Philips PM6672 Timer Counter Teardown
« Reply #3 on: April 05, 2012, 10:30:37 pm »
"The radio switch contacts" I almost thort what you on about,  but then it became clear grass hopper. slide switches.
Radio switches / buttons are the pushbuttons that are arranged in a group such that when you push one in, whichever one was pushed in previously pops back out.  That's also where the name for the GUI controls with the select-only-one-'checkbox' behaviour comes from, incidentally.
 

Offline quantumfall

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Re: EEVblog #265 - Philips PM6672 Timer Counter Teardown
« Reply #4 on: April 05, 2012, 10:50:44 pm »
Thanks for that, how easy it is to forget / remember the things you have used before.

Perhaps its just me a  dumb arse :)
 

Offline wkb

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Re: EEVblog #265 - Philips PM6672 Timer Counter Teardown
« Reply #5 on: April 06, 2012, 07:39:37 am »
The chip in the ceramic DIP with the OQ marking is a custom chip of some sorts.  OQ stood for Outstanding Quality (no kiddin' !) They were designed by the SSP (Solid State Special Products) group of Philips Semiconductor.

I did my graduation work at SSP in Nijmegen, the Netherlands around 1987  :o
 

Offline wiss

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Re: EEVblog #265 - Philips PM6672 Timer Counter Teardown
« Reply #6 on: August 18, 2016, 08:22:40 pm »
The option port on the back is for GPIB and other options.
The 6671 has a hold of instead of the GHz input, the GHz/hold of are not options but different models using the same board.
« Last Edit: August 19, 2016, 04:25:32 pm by wiss »
 


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