Back from vacation


KB6NAX
 

I bowed out of posting to TekScopes a few years ago because of the dearth of vacuum tube 'scope postings. More recently I've become a fan of Tek 455 'scopes. For 465M lovers the too models have identical power supplies. 455's frequently appear on the 'bay and I've bought a few "for parts/repair" units and now have eight restored. Two to go with bad HV supplies that are now guinea pigs for building from scratch replacement HV multiplier modules. Both the scopes appear to have good transformers and will produce +95 volts when run with a module that has the 3x multiplier disconnected. I've been on and off that project for about a year now but when time is available I continue to solve some of the riddles of how to make a good module. I'm about to construct a breadboard to tackle the mysteries of the bias clamp circuit. The 3x multiplier will be outboard and far enough to avoid getting zapped by 10KV, If anyone is interested I'll post my progress/results.

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