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Thread: General Scanning G124-PD

  1. #1
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    Default General Scanning G124-PD

    General Scanning G124-PD - Has anyone ever heard of this model of scanner?

    I know of the G124 which is a wide angle scanner (but not much good for scanning as it has no feedback), but the one Iím asking about looks like a G120-PD.

    The reason I ask is that I have two of them and I canít find any details on them.

    Even when I purchased them second hand back in the early nineties I contacted General Scanning and they didnít even know of them. So Iím assuming that they are either OEM or a beta model that never made production.

    Interestingly enough though the serial numbers range up in the 1700ís (if thatís an actual indicator of how many have been made)

    BTW, I am looking at selling them with the mount, mirrors and amps (GS A600)




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  2. #2
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    Wow, looks like a G120 but with a G124 torsion bar. Never seen that before.

  3. #3
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    These look exactly like G-138's. I wonder if they were some kind of pre-G138 model. The 138 was nice because it had a much wider scan angle than the 120 because of the longer torsion bar like the 124, but had the feedback like the 120. Very neat item, I didn't know it existed!

  4. #4
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    Wow, I never actually realised that its torsion bar was longer than on a G120, I thought they were identical.
    RTI Piko RGB 4 Projector
    CT6215 Scanners & CT 671 Amps; CT6210 & Medialas Microamps. GS124PD
    RGBLaser Systems 6000mW RGB Module - 638nm/445nm/532
    LD2000 Pro + QM2000.net + Beyond
    Etherdream + LSX

    Old Projector Build


  5. #5
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    Interesting question. The General Scanning G-124 and G124-PD models were the open loop and closed loop (PD version) of a popular scanner in the beginning days of Laserium and into the 1980's. I used a set to do shows in a local college planetarium in the late 1970' (we could only afford the open loop version). Very solid scanners for the day and small as well, not cheap in 1978 dollars for college nerds.

    The current technology has made great improvements in galvos with more accurate feedback for better closed loop speeds.

    Thanks for the question it took me back down memory lane to my college days.

  6. #6
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    I also have a pair of G124s with the Feedback sensor installed. The T-bar on my pair is the G138 long T bar, a bit longer then the normal open loop G124 Torsion Bar..
    Steve
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  7. #7
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    Hey Steve, Those wouldn't be this actual pair would it?, I sent you these back in may 2013 :-)

    Troy
    RTI Piko RGB 4 Projector
    CT6215 Scanners & CT 671 Amps; CT6210 & Medialas Microamps. GS124PD
    RGBLaser Systems 6000mW RGB Module - 638nm/445nm/532
    LD2000 Pro + QM2000.net + Beyond
    Etherdream + LSX

    Old Projector Build


  8. #8
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    I used to have a set of open loop g-124s back in the early 90s. Even open loop, they were pretty damn good. That torsion bar suspension would give the scanners around 5kpps~7kpps(estimating) performance. That doesn't sound great for graphics but for simple geometrics and abstracts, they were pretty awesome. You could get some basic text out of them too. Not bad considering xy scanning systems were well over $2500 and even more when you added a 3rd blanking galvo. Thinking about those good old days really hits me in the feels! I miss it.

  9. #9
    mixedgas's Avatar
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    A local surplus place about two years ago was getting in 2 new in the box or barely used g124s a week. From X-ray film printers. I was making weekly trips. I sold some, then built up a pile of personal reserve. The galvo that works no matter what, when all else fails.


    Yes, Loopee, the 124pds are an interesting part of my collection. The sensors work, too. I fired them up the other day, but did not tune them yet.



    Steve
    Qui habet Christos, habet Vitam!
    I should have rented the space under my name for advertising.
    When I still could have...

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