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I have a working 19" WG chassis pulled from a APB. I would like to know if it can be converted to work on a 25" tube, med res?
Not sure if that fly will handle 25KV for any extended period, so that substitution may be the deal breaker.
It will. The same flyback is used in the 25" standard resolution 4900, running an anode voltage of 25kv.
-Ian
But the 25k5515 (25" Medium resolution) uses a different flyback.
There a variety of different components that need to be replaced. Regulator and Flyback are just the beginning.
But the 25k5515 (25" Medium resolution) uses a different flyback.
True, but the 5515 is also a redesigned circuit. Perhaps it was for reliability, or perhaps fly availability necessitated a part change that drove the circuit to be redesigned.
Assuming the tube & yoke are electrically compatible (which they may not be), the tube is geometrically designed to spread the electron beam across a 25" screen. In the end, all you're trying to do is provide the proper voltages to allow the tube to project the same image a bit farther so it can spread a bit wider at the same intensity.
I know that long before I found klov, I was shopping for a replacement chassis to have someone install. Two I bought off ebay were sold as 19K49xx's, but were actually 13" (IIRC). The arcade tech told me it would work, but that overdriving the fly would cause it to fail prematurely. All of that may have been BS, but apparently such a swap isn't unheard of.
SuperBee, what's the tube number and socket type on that 25K?