I was just reading the Lisa Hardware manual from 1982, and it mentions that the CRT is a P4 phosphor. So I suppose this is more like the designers intended?

I wonder when the switch to P7 happened.

~10 years ago I got a NOS Lisa spare CRT, and the date on the tube is from 1978! I wonder if they just pulled whatever the tube maker had on the shelf?

With NOS CRTs being available so cheaply, I'd be hard pressed to go through the work of installing a used one with unknown hours on it. But the point remains: 12" B&W CRTs are still readily available either new, or from other equipment. If your CRT is tired keep your eyes open for a replacement. In my opinion having a fresh, crisp crt makes the system much nicer to use.

Thanks,

-J

On Mon, Nov 13, 2017 at 1:23 PM, PSchaefer <dr.p.schaefer@gmx.de> wrote:

Am Sonntag, 12. November 2017 18:00:47 UTC+1 schrieb compu_85:

Re: CRT. The wonderful world of FleeBay. Most 12" mono CRTs are electrically compatible. I did some looking for "12" CRT" and came up with some good results...

Goldstar (LG) 310KAB4K is an excellent choice. It is sitting inside the Atari SM124 display unit, which can be bought for less than $10.

Green or amber CRTs would also work. Many years ago I had to fix a Mac128 with broken CRT, and the only spare available that day was a green CRT from a cash register. It worked, and the owner liked it. I don't know what happened to this machine and if he ever got a paperwhite tube for it.

Patrick

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