4P CRT swap

[mloewen]

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?

 

[Slob]

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!

 

[TRS-Ian]

You can put a green CRT from a later 4P in no probs. I've done it many times

 

[KC9UDX]

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

 

[mloewen]

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?

 

[Jay Newirth]

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

 

[mloewen]

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:


During:


After:

 

[Jay Newirth]

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

 

[TXNathan]

What do you charge for those babies Jay?

 

[Jay Newirth]

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