Brianc wrote:Hi Ian. One cardboard cap was missing and the other damaged so I had to make both complete assemblies. I sourced some card of the right thickness and used the old one, opened up, as a template. The metal fixing plate also had to be made. One of the things I did for these and the tubular caps was to buy a cheap (£14) mini deep fat fryer and some beeswax. The fryer is thermostatically controlled and can be set to under 100deg. so that the wax doesn't get too hot.
Brianc wrote:The last RF stage drives the anode bend detector via a bifilar wound transformer. I was able to make rewinding easier by sourcing some ready made bifilar wire from a company called The Scientific Wire Company (http://www.scientificwire.com). This is a useful source of all sorts of “magnet wire” as enameled copper wire seems to be called now!
Brianc wrote:The second picture shows the sweep of the RF section from aerial to CRT cathode It starts at 45MHz and finishes at 48.5MHz so the results so far are not too bad. The 9 cores to be tweaked make for an interesting exercise in patience and memory (that’s a bit of a blow for me!) because every adjustment seems to affect the waveform in some way but, more annoyingly, seems to affect the effect that the previous core made before!
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