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Tube vs tube
Andy,
On close inspection of my CTC-5 with the 21CYP22 in place of the 21AXP22A, there is absolutely no modification of the mask.
The 21CY sits just behind the mask. The tube sides are fully exposed but the top and bottom are slightly masked. I believe RCA ads stated the CTC-5's with the 21AX as having 254 sq.in. and the CTC-7 with a 21CY with 260 sq. in. of viewable picture. The CTC-7 mask most likely has a slightly larger opening to account for the difference. And also explaines why the extreme top and bottom of the 21CY conversion in my 5 is not viewable.
Last edited by Steve D.; 07-30-2003 at 11:11 AM.
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