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I doubt it was a home brew.....
A shop in that era would have replaced a 21AX with a 21CY as it was thought the 21CY was a better tube, or maybe a 21AX wasn't available or cost prohibitive.
We were picky and didn't like to sub tubes, but it WAS common practice.
And really.... would the stupid "Wizard of Oz" shot that everyone seems to post look that different on a 21CY?
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