EEVblog Electronics Community Forum

EEVblog => EEVblog Specific => Topic started by: quantumfall on April 05, 2012, 07:06:46 pm

Title: EEVblog #265 - Philips PM6672 Timer Counter Teardown
Post by: quantumfall 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.
Title: Re: EEVblog #265 - Philips PM6672 Timer Counter Teardown
Post by: Rufus 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.
Title: Re: EEVblog #265 - Philips PM6672 Timer Counter Teardown
Post by: quantumfall 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.
Title: Re: EEVblog #265 - Philips PM6672 Timer Counter Teardown
Post by: baljemmett on April 05, 2012, 10:30:37 pm
Quote from: quantumfall 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.
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.
Title: Re: EEVblog #265 - Philips PM6672 Timer Counter Teardown
Post by: quantumfall 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 :)
Title: Re: EEVblog #265 - Philips PM6672 Timer Counter Teardown
Post by: wkb 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
Title: Re: EEVblog #265 - Philips PM6672 Timer Counter Teardown
Post by: wiss 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.