Pretty sure the 79 will be a T809 or t815, in-line tube like a zenith tri-potential WILL have a radionic 4-lead critical cap !!!
I had one as a daily driver for about 8 years...till a CTC 169 replaced it. Actually mine was a MICRO tune--you did NOT have to "pre tune " EVERY channel like the touch tune sets--and it did NOT need an alkaline battery to hold memory either. Put a rebuilt tube in it--STILL looked good--when I gave it to some idiot in the summer of 98...supposedly he got mad at his girlfriend and kicked the screen in or such I heard later.
I THINK..25VEUP22..
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