Crosley 1949 - Horizontal Linearity Issue

[SteveMartin]

After much troubleshooting I believe the most likely component failure is L28, the horizontal linearity control coil. Even though the resistance measures good (37 ohms), the adjustment has no effect on the linearity or the signal waveform. Crosley lists this as part# AW-160281. Does anyone know where I can get a replacement part? Thanks.

[Penthode]

Originally Posted by SteveMartin

After much troubleshooting I believe the most likely component failure is L28, the horizontal linearity control coil. Even though the resistance measures good (37 ohms), the adjustment has no effect on the linearity or the signal waveform. Crosley lists this as part# AW-160281. Does anyone know where I can get a replacement part? Thanks.

I would be very suspicious suggesting the coil is bad if it measures the correct resistance. Did you examine the coil to see if the core is intact? Or why it is not adjusting?

Have you confirmed the correct 0.035uF and 0.05uF capacitors are properly connected? Is R113 across the 5V4 Damper okay?

I would refer to the RCA 630TS service data for the synchrolock circuit waveforms. So far the waveform input to the horizontal output tube appears to match between your waveform and the RCA service data. This suggests the nonlinearity is from the horizontal output stage and after.

Phil Nelson kindly put the manual on line for our reference.

https://www.antiqueradio.org/art/RCA630TSService.pdf