Re: Refurbishing a 465 (earlier serial) with a strange intensity issue
Hi John and Sigurdur (did I spell it righT?).
I've been down this road with my 464 and tried the rejuvenation and also
played with the filament winding.
If you look at the tekscopes pictures, look for "Tek464 CRT Double-Peaking"
or just click on the link:
The schematics are for reference only, as it employs a computer
voltage-stabilizer transformer, which had many taps and was suitable for
this project, but you won't probably find any alike.
As a comment for Sigurdur's comment:
"It might be simple enough to add a winding or two to the heater
1st. It's indeed easy to add windings (at least on the 464 is and as far as
I could see, the 465 xfromer is alike. It's a separate bobin/former.
2nd. Just be cautious about the number of turns you add, because the full
winding may be just 3 turns (like on the 464), so, if you add 2 turns, you
may be adding 66%.
You can always unwind the original and count of how many turns it's made of
and take from there. Never fear, they come out easily and can be rewound
just as much.
3rd. Mind to use wire with HV insulation because, as though the winding
voltage itself is low, it's at -2500V potential and if it gets near or in
contact with other parts of the circuit and its insulation is weak, you can
get a spark where that high-voltage shouldn't get. I immediately think of
the low-voltage side of the DC restorer and the Unblank and Z axis
amplifier, because they're all nearby the HV circuitry.
2017-07-06 14:31 GMT-03:00 Sigurður Ásgeirsson siggi@... [TekScopes] <
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