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 Post subject: 21AUP4 vs 21ZP4 = compatible ?
PostPosted: Oct Fri 23, 2020 5:19 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Rockaway , nj 07866
Anyone know if they are compatible ?


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 Post subject: Re: 21AUP4 vs 21ZP4 = compatible ?
PostPosted: Oct Fri 23, 2020 5:23 am 
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Joined: May Sun 07, 2017 11:35 am
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Location: Belrose, NSW, Australia
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Dimensionally compatible. The AU has ES focus, it does not need a focus magnet. The Z needs a focus magnet.

I would regard them as compatible in that your alternatives are limited these days, if you have a good 21ZP4 and can locate a focus magnet for a set that doesn't use one, you are OK. On the other hand, removing a focus magnet where it's not required is simple, you just need to connect the focus pin on the CRT socket to G2 or GND, whichever gives the best focus.

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 Post subject: Re: 21AUP4 vs 21ZP4 = compatible ?
PostPosted: Oct Fri 23, 2020 9:38 pm 
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Location: Detroit, MI USA
There are several factors one needs to look at when determining compatibility in general.

There is more than one envelope size for 21" tubes and there is more than one faceplate shape. You start out by looking at those, on tubes with the same neck diameter and deflection angle.

You also have to look at operating voltages and basing, as well as focus method, filament voltage, and for series string TV's filament current is important.

It's often possible to come up with a substitute that can be made to work even if it wasn't listed in substitution guides at the time. Occasionally you have to get creative.

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