tube tester dual focus DEAD (Attempting ZOMBIE) nope still dead

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lilshawn:

--- Quote from: MonMotha on June 07, 2011, 05:17:26 pm ---Have you tried using an isolated supply (e.g. a few turns around the flyback) for the heater supply to remove the ground path?

--- End quote ---

I haven't, but I just might. I read some stuff in the B&K manual regarding the use of a 1:1 transformer. I've tried to source 1:1 transformers locally for use in ground loop isolators to no avail. but your suggestion just now jogged my memory about something else i read a while back about using the flyback as a power supply to increase the voltage to the heater to fix low emissions... :cheers:

I'll have to see if there is room to get a wire through the core... there should be. I'll have to check tomorrow. (it's at the shop)

Otherwise the tube is good. the gun still emits, in fact it's slightly better than the other two.

any recommendations on how many core turns I might need to get around 6 volts? I guess I could start with 1 and work my way up... maybe i'll just wrap as much wire as it will hold and see what happens :lol :lol

MonMotha:
There was a link floating around at one point, but I can't find it. I seem to recall 2-3 gets it about right. Remember that you'll need a true RMS meter if you want to measure it. I know qrz has commented on this process before; you might ping him.

lilshawn:

--- Quote from: MonMotha on June 07, 2011, 09:37:59 pm ---There was a link floating around at one point, but I can't find it. I seem to recall 2-3 gets it about right. Remember that you'll need a true RMS meter if you want to measure it. I know qrz has commented on this process before; you might ping him.

--- End quote ---

'sall good. I have a Fluke 87 series V. it's almost bullet proof. Someone once said that you could put it into Ohms range and plug the leads into a wall socket, but I don't want to try it.

MonMotha:
I once ground looped the AC from my bench via an oscilloscope. Had the scope ground lead on the primary DC- side of a SMPS design and totally forgot about it when I went from a 24V (isolating) transformer to straight 120V (no iso) input for testing. Made a nice pop before the fuse on the DUT (thankfully) blew. Scope shut off. I was afraid I'd broken the thing. Cycled the power switch, and it came right back up good as new. All the self tests and calibration checked out. Thank you Tektronix.

lilshawn:
Well I did as you suggested and put 2 turns on the flyback. Test...10.06 volts... Alright take off a turn... 6.96... close enough

Sigh... Still no color though.

I'm going to try some Frankenstein stuff... Gonna jump a working color CRT socket pin to the non-working one. BRB

Nothing still. Double sigh. It looks like the color I jumped it with is dragged way down to near nothing. Something is defiantly FUBAR.

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