Flyback Part # For Zenith 17X22U Chassis
 

Hello,
I have a 1957 Zenith X2248RU console set that is needing a flyback. I was using the set daily until it went bad about 2 months ago. I'm wanting to see if there's a part number for a replacement flyback. It has the 17X22U chassis. I've tried horizontal output, & the horizontal output tube with no luck, so it leaves me with knowing the flyback is dead. If anyone knows what the part number is on one of them please let me know so I can start looking for one and start pricing the part. I included a picture of the set itself. Thanks in advance.

-Jacques

Does the fly look burned out or test open? There are a LOT of things in the horizontal section that will cause you to loose HV if they fail. Check the voltages on the base of the horizontal output tube and compare them to what is listed on the schematic (Which you should own a copy of). If the Horizontal oscillator is not running (or poorly running) you can change the fly, all the tubes, the yoke, etc., and still not get your HV back.

Has this set had all it's electrolytic and tubular capacitors replaced? If not, you ought to do that too.

If what I read into this is ; that you've substituted both the horizontal OSC and horizontal output tubes with known good tubes to no success in getting it working again , and that's as far as the troubleshooting has gone , then I agree with EM that you've taken FAR too large a leap between it being either the tubes or flyback . Unless there is something else , symptom wise , that you haven't told us like the flyback actually went up in flames or smoked the room out as it boiled all it's wax out onto the chassis , as EM states there could be half a dozen resistors and maybe even a Baker's dozen of capacitors , as well as a couple other small coils that could cause the loss of horizontal drive . Not to mention the yoke itself . Also of note , you say you "tried" the tubes , what exactly does this mean ? Did you try known good tubes as substitutes ? Rely on the reading of a tube tester ? I ask because in this instance "tried" is kinda vague , and if it WAS a tube tester that proclaimed these tubes "good" , it is well known that the only absolute proof of a good tube is to see it function in it's designed application . And this is most prevalent with HF circuits such as your failed horizontal drive circuit here .