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Now a little more data to make things confusing...
I happen to have an Emerson 637 in the shop. It's a 10" B/W set from 1949 and it works very nicely. Took the chassis out and tried the ringdown test on this set with a "known good" flyback, and look what I get!
1. Emerson 637 ringdown, with flyback in circuit (yoke, etc., connected)
2. Emerson 637, with yoke disconnected (removing other connections had little effect, also tried pulling 1B3 to remove filament load, but didn't matter)
3. Merit HVO-5 NOS, very similar to what's in the Emerson. No connections.
OK, so the Emerson flyback doesn't look very good in a ringdown test, but it works in the set! And it compares badly with an NOS flyback that looks very similar and might even be the right replacement (it's the fairly common early style flyback used in the late 1940s with a more metallic-looking core, not ferrite or laminated).
HV in the Emerson is 9 kV, which is just what it should be.
Not sure what to make of that!
Last edited by Tom Albrecht; 11-15-2013 at 12:47 AM.
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