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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
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7th Oct 2018, 4:59 am | #1 |
Retired Dormant Member
Join Date: Aug 2013
Location: Brisbane, Australia
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Heathkit Oscilloscope Model OS 1, Gloucester England
I have a little Heathkit oscilloscope that I would like to restore.
It is a model OS 1 from Heathkit, marked Gloucester, England. Can anybody provide me with a circuit diagram? Thanks, Dan Brisbane, Australia |
7th Oct 2018, 7:23 am | #2 |
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Re: Heathkit Oscilloscope Model OS 1, Gloucester England
You can download the circuit diagram from here
https://www.vintage-radio.info/heathkit/ It doesn't have the complete manual for the OS 1 Again like this forum it's Paul who maintains the archive. Cheers Mike T
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7th Oct 2018, 8:19 am | #3 |
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Re: Heathkit Oscilloscope Model OS 1, Gloucester England
Thanks Mike. I appreciate that.
It's a rather cute little oscilloscope and I'd like to see it operational. It has suffered from a number of previous attempts at repairs but I'm sure to sort it with the schematic. One significant issue will be the removal of numerous Hunt's capacitors.. I'm very familiar in dealing with these blighters from my old R and TV days when I encountered the various British sets that emigrated down-under! We had similar leakage issues with the old pitch potted AWA capacitors. Cheers, Dan |
7th Oct 2018, 8:30 am | #4 |
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Re: Heathkit Oscilloscope Model OS 1, Gloucester England
Well have fun with it Dan
I have a couple of kit scopes in the rountuit pile, again suspect caps waxies in one case about 40 of the blighters Cheers Mike T
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7th Oct 2018, 9:21 am | #5 |
Hexode
Join Date: Feb 2006
Location: Diss, Norfolk, UK.
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Re: Heathkit Oscilloscope Model OS 1, Gloucester England
Dan,
Apart from the capacitors, check all the resistors I think most of them will be out of tolerance, probably high. Unfortunately Heathkit did not use the best quality components in their otherwise good designs of the time. Good luck Trevor |
7th Oct 2018, 12:10 pm | #6 |
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Re: Heathkit Oscilloscope Model OS 1, Gloucester England
Thanks chaps,
I'm looking forward to the repair. I'll keep you posted. Cheers, Dan |
7th Oct 2018, 4:49 pm | #7 |
Dekatron
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Location: Croydon, Surrey, UK.
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Re: Heathkit Oscilloscope Model OS 1, Gloucester England
The scopes are quite basic. I don't think the bandwidth extends much above 3.5Mhz. They were good for audio and (probably) for the 405 TV system we used in the UK in the B/W days. Don't expect to be able to see digital switching signals.....!
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7th Oct 2018, 6:12 pm | #8 |
Nonode
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Location: Walsall Wood, Aldridge, Walsall, UK.
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Re: Heathkit Oscilloscope Model OS 1, Gloucester England
Hi!
You can download, free and no registration needed, the August 1960 of "Radio Constructor" magazine from the American Radio History Website for the complete article on this instrument, specifications, a circuit description and a full Component List, together with the circuit and a front panel layout drawing - I recommend you get this and study the details provided therein! Chris Williams
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7th Oct 2018, 8:57 pm | #9 |
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Re: Heathkit Oscilloscope Model OS 1, Gloucester England
Thanks Chris, that article is perfect.
As it turns out I had already downloaded all those Radio Constructor magazines. David Gleeson deserves our undying gratitude for his site. I wonder what other articles that I desperately need are already on my PC? Cheers, Dan |