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Dumont RA-113 (B3) restorations
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09-12-2016, 12:01 PM
bandersen
RCA 741PCS
Join Date: Mar 2009
Location: Chicago, IL
Posts: 8,808
I popped the cover off the HV cage for a closer look. It appears the flyback has been replaced. The three HV caps were replaced with 470pF ceramic caps rated for 15kV.
I scavenged a suitable yoke from an Admiral and fired it up. I could hear the horizontal oscillator kick in and after a bit of control tweaking got a raster
This is the best I could get after going through all the various horizontal adjustments. The free running frequency and synchro waveform look OK. I'm thinking it's a problem in the sync separator circuit.
The video looks sharp so I'm hoping for a real nice picture soon as I can sort out the hor. hold issue. Also upside-down and backwards but that just requires some lead swapping.
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