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Old 2nd Jan 2023, 6:47 pm   #1
VTRestorer
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Default Tektronix 651HR monitor

I have been fixing some Tek stuff recently. The last item is an old 651HR with a reasonable tube. There is a problem with the PAL decoder. I cannot find a manual or schematic on the web.

Can anyone point me in the right direction.

Thanks

Jonathan
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Old 2nd Jan 2023, 7:48 pm   #2
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Default Re: Tektronix 651HR monitor

The 651 was to be found in various pieces of broadcast kit, I remember them in Ampex 1" 'C' format VTR monitor bridges. I think each monitor came with a full service manual and its serial number printed inside the front cover. So I'm sure a manual could be located. It is one seriously complex monitor, from memory just the sync seperator contained dozens of transistors.
That's what you get when you ask a scope manufacturer to design a tv monitor. Having said that they were quite reliable.
Good luck with your search.
Les
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Old 2nd Jan 2023, 9:50 pm   #3
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Default Re: Tektronix 651HR monitor

That's right.

It came out of an Ampex VPR-2B monitor bridge. Have an Ikegami monitor in there at the moment. Did not seem decent to install a Sony BVM.
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Old 3rd Jan 2023, 10:52 am   #4
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Default Re: Tektronix 651HR monitor

Hope your VPR-2B is in good order. We had 12 Ampex 'c' format machines. VPR-2's, VPR-2B's, plus 3 Marconi MR-2's which I looked after for several years before moving to MII format.
Good luck with your search for a 651 manual
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Old 5th Jan 2023, 8:45 am   #5
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Default Re: Tektronix 651HR monitor

Yes it is. Finally.

Took about six months of evening work to get it running properly including AST. Much, much more than any other project.

Still not totally happy with the velcomp on the TBC-2B (vs my TBC-6), but have been told that the circuit was always a compromise.

But it records and plays back in accordance with its spec and interchanges well with my other machines.

Jonathan
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Old 5th Jan 2023, 2:28 pm   #6
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Default Re: Tektronix 651HR monitor

We didn't really suffer many AST problems, apart from when the "dog house" slip rings arced over. I did hear the BBC ran some of their VPR's with AST turned off to improve picture quality. We thought loosing still frame and slo-mo was not worth any possible slight improvement.

Later TBC's were certainly better regarding signal processing, we inherited 3 VPR-3's which were excellent.

Sorry for going off topic from your request for a Tek 651 manual.
Les
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Old 5th Jan 2023, 2:44 pm   #7
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Default Re: Tektronix 651HR monitor

Quote:
Originally Posted by VTRestorer View Post
I have been fixing some Tek stuff recently. The last item is an old 651HR with a reasonable tube. There is a problem with the PAL decoder. I cannot find a manual or schematic on the web.

Can anyone point me in the right direction.

Thanks

Jonathan
Hi, I had five of these monitors at one point, which I purchased from Humphries video (Mitcham) when they closed in 2008.
Over the years, I’ve passed the monitors (which mostly still worked) on to other collectors to put in the monitor bridges of VPRs.
At one point, I wanted to collect an example of every broadcast manufacturer’s monitor, Barco, Chroma, Melford, Sony, Tektronix, Vistek, etc but I was told I was mad and the practicalities of it (especially storage) didn’t work out.

I did however end up with most of the manuals for different monitors but finding them is a battle, as they are buried in storage.

There is a Tektronix yahoo group, so it may be worth posting on there about the issue and there is a possibility that someone has already scanned the manual.

Regards,
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Old 5th Jan 2023, 6:46 pm   #8
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Default Re: Tektronix 651HR monitor

I wonder if the OP might also consider joining this group?

https://groups.io/g/OldVTRS

Lots of posts concerning ‘old’ vt equipment and associated kit including monitors etc.
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Old 6th Jan 2023, 9:28 am   #9
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Default Re: Tektronix 651HR monitor

Thanks for the suggestion, but I am already a member.

I have posted on the Tektronix group as suggested.

Jonathan
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Old 6th Jan 2023, 10:25 am   #10
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Default Re: Tektronix 651HR monitor

Thanks for the suggestion, but I am already a member.

I have posted on the Tektronix group as suggested.

Jonathan
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Old 6th Jan 2023, 8:06 pm   #11
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Default Re: Tektronix 651HR monitor

Then you probably know that someone on that group has previously posted that they have copy of the manuals for the HR650 which might be a starting point if nothing else turns up?
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Old 7th Jan 2023, 9:23 am   #12
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Default Re: Tektronix 651HR monitor

Thank to everyone's help I have downloaded a perfect copy of the manual.

Jonathan
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Old 23rd Jan 2023, 10:07 pm   #13
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Default Re: Tektronix 651HR monitor

Just wanted to thank everyone.

The monitor is now working better than ever and fully aligned to D65.

Will shortly be going back into the VPR-2B monitor bridge.

Jonathan
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Old 24th Jan 2023, 12:07 pm   #14
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Default Re: Tektronix 651HR monitor

Well done Jonathan, glad to hear the 651HR is up and running to spec again.
Les
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