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Sets, Parts and Service Information Wanted (private buyers only, no swaps) If you need help obtaining components, sets or equipment, post a message here. Private buyers only - no traders. No swaps.

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Old 21st Jul 2021, 12:07 am   #1
jamesinnewcastl
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Default Tek 7L12 Spectrum Analyser Manual Wanted - Later Version

Hi All

I've landed a Tek 7L12 Spectrum Analyser for 150 which seems to be working!

I've down loaded a manual but it is for the earlier version without the L.O. outputs (but not the one with the newer knob sadly).

Anyone have a file of, or hardcopy of the later manual please?

Cheers
James
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Old 21st Jul 2021, 9:49 am   #2
chriswood1900
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Default Re: Tek 7L12 Spectrum Analyser Manual Wanted - Later Version

Hi James
Have you seen the info on the Tek Wiki site here https://w140.com/tekwiki/wiki/7L12
it may be useful.
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Old 21st Jul 2021, 10:02 am   #3
Craig Sawyers
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Default Re: Tek 7L12 Spectrum Analyser Manual Wanted - Later Version

150 for a working 7L12 is a good price. I built mine from two parts units - there was enough parts between them to complete one functional unit.

They had been pulled from a skip, including a 7000 series mainframe that has been hit so hard that one of the side panels had a massive tear in it. Even after that sort of abuse it worked perfectly!

Yes - indeed the Tekwiki site is the go-to place for Tektronix manuals.

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Old 21st Jul 2021, 10:45 am   #4
jamesinnewcastl
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Default Re: Tek 7L12 Spectrum Analyser Manual Wanted - Later Version

Hi Chaps

I have already drained the Wiki site dry - the manuals there are the older ones.

I doubt there is too much difference but I noticed oddities in the set-up text possibly related to the slight differences in old and new. I am hoping the newer one will be more relevant.

The 7L12 is an amazing mess of plumbing and mysterious boxes, I was assuming something wrong with it and not looking forward to tracking any issues down. But until I get it set up I still can't be sure it is really OK.

I have an old Marconi SA which I used to make the Avatar next to my posts - I can't seem to get the same sort of 'text-Book' images from the 7L12 so I'll have to keep playing.

Cheers
James
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Old 21st Jul 2021, 11:49 am   #5
chriswood1900
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Default Re: Tek 7L12 Spectrum Analyser Manual Wanted - Later Version

According to the Vintage Tek site Tantalums are the biggest problem (aren't they always!).
This link may help https://www.youtube.com/watch?v=f02rCpkjs8Q
It also shown what you getting on a working display.
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Old 22nd Jul 2021, 10:30 am   #6
jamesinnewcastl
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Default Re: Tek 7L12 Spectrum Analyser Manual Wanted - Later Version

Hi

I'm still after the later manual. With regard to waveforms that might be displayed I found this:

https://w140.com/tekwiki/images/9/9f...1_Jan_1972.pdf

Cheers
James
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