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Thread: 4P CRT swap

  1. #1
    Join Date
    Jul 2005
    Location
    State College, PA
    Posts
    160

    Default 4P CRT swap

    My 4P currently has the white CRT. Is it possible to simply swap out the white one for a green CRT, or does the green CRT require a different sweep PCB? Are the CRTs still available?

  2. #2

    Default

    To the best of my knowledge, the phosphor color of the tube makes no electrical difference, although it might have a SMALL affect on brightness settings. For example, I could get green, amber, or old-timey white (actually, kind of blue) tubes for my ADM-3 terminals (I chose white). I could get green, amber, or “paper” white for my DEC VT-320’s. I changed those to white because I don’t like amber and VT-320’s were available in those colors when new. No adjustments were needed.

    My advice would be to get a mfr and part number OFF OF THE TUBE (NOT from a service manual, the suppliers changed often back then and there may be board component differences depending on supplier), then contact a CRT supplier like VDC in Tucker GA. Call, they have a terrible website but never failed me.

    Also, be careful!
    Last edited by Slob; November 14th, 2019 at 10:19 PM. Reason: Can’t spell, can’t write either

  3. #3
    Join Date
    Sep 2011
    Location
    Melbourne, Australia
    Posts
    1,012

    Default

    You can put a green CRT from a later 4P in no probs. I've done it many times
    *There is never a charge for Tech Support even if you don't purchase from me - We are Enthusiasts Helping Other Enthusiast and that is just the way it is

  4. #4

    Default

    Huh. If you were local I'd trade you for the green one in my PET.

  5. #5
    Join Date
    Jul 2005
    Location
    State College, PA
    Posts
    160

    Default

    Quote Originally Posted by TRS-Ian View Post
    You can put a green CRT from a later 4P in no probs. I've done it many times
    Thanks, Ian. Do you have compatible CRT part numbers?

  6. #6
    Join Date
    Mar 2016
    Location
    Pikesville, Maryland
    Posts
    215

    Default

    I happen to have them available with the Yoke assembly attached .... just swap the 2 assemblies

    For more information visit my website at plaidvest.com/newsoft

    Thanks

  7. #7
    Join Date
    Jul 2005
    Location
    State College, PA
    Posts
    160

    Default

    I picked up a green CRT from Jay's site, and made the swap this evening. Works great! While I was in there, I proactively replaced the large RIFA cap in the power supply.

    Before:
    Model4P-White.jpg

    During:
    Model4P-CRTs.jpg

    After:
    Model4P-Green.jpg

  8. #8
    Join Date
    Mar 2016
    Location
    Pikesville, Maryland
    Posts
    215

    Default

    I'm glad it worked out for you ................

  9. #9

    Default

    What do you charge for those babies Jay?

  10. #10
    Join Date
    Mar 2016
    Location
    Pikesville, Maryland
    Posts
    215

    Default

    Please visit my website plaidvest.com/newsoft for pricing. Shipping is additional

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