Re: Tek 154-0812-00 Storage CRT
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Wow. Well with that I suppose you are on the only path available. I guess it must have been built under tension or??? That is a big gap. I was envisioning something akin to an open light bulb, Sometimes you can get lucky and even shake the element back together to get it to work for a while again. Anyway, good luck I will keep an eye out for replacement. ? Then again maybe there is still a glass worker out there that could cut the tube, replace the guts, reapply vacuum¡. and¡¡ oppps pipe dream ¡never mind *smile *¡I promised myself not to dream so much this year¡ Rob ?
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From: TekScopes@... [mailto:TekScopes@...] On Behalf Of wendtmk
Sent: Tuesday, January 01, 2013 3:41 PM
To: TekScopes@...
Subject: [TekScopes] Re: Tek 154-0812-00 Storage CRT? ? Rob,
The hard part would be getting the strap near enough to the pin to "weld" it back to the pin. The pin, inside the jug, looks like it's been bent, though I don't know how that would have happened. I inspected the rest of the CRT to see if it had maybe been dropped, but nothing else in the jug looks out of place. Very strange. I picked up the SC503 knowing it didn't work. I was hoping it would be something I could replace a little easier than this hard-to-find CRT. ;-)
Mark
--- In TekScopes@..., "Rob" <rgwood@...> wrote:
>
> Some of the old CRT testers also have a last ditch heater re-weld function
> as I recall. I remember the shop I worked in back in the 80's had an old
> tester (for black and white only as I recall and/or you needed some special
> socket for color but again 20 year old memory)
>
>
>
> Anyway, I like Tom's approach (mostly because it is recent and doesn't rely
> on 20 year old memory * smile* ) but it may bear fruit to look into some of
> the old CRT rejuvenators. I recall there were two last ditch things. One was
> to reattach a heater the other "boiled the cathode". The former had slight
> chance of working, the latter usually worked but was like putting a banana
> in your car's differential. A last ditch effort that brought back some
> limited life but was not a "fix".
>
>
>
> Hopefully helpful and good luck. Sorry I do not have a line on a new/used
> CRT for you.
>
> Rob
>
>
>
> From: TekScopes@... [mailto:TekScopes@...] On Behalf
> Of Tom Miller
> Sent: Tuesday, January 01, 2013 2:54 PM
> To: TekScopes@...
> Subject: Re: [TekScopes] Tek 154-0812-00 Storage CRT
>
>
>
>
>
> Hey Mark, try this.
>
>
>
> Connect a 47 uF, 450 volt capacitor across the heater pins. Charge the cap
> through a 47K 1 watt resistor to 499 volts or so. When charged, tap on the
> neck to get the strap to vibrate enough to come in contact with the pin. The
> arc may re-weld the connection. Nothing to loose, right?
>
>
>
>
>
> Tom
>
>
>
> ----- Original Message -----
>
> From: wendtmk <mailto:mark.wendt@...>
>
> To: TekScopes@...
>
> Sent: Tuesday, January 01, 2013 3:10 PM
>
> Subject: [TekScopes] Tek 154-0812-00 Storage CRT
>
>
>
>
>
> Looking for the CRT for the SC503. Shows an open on the ohm meter across the
> heater. Pulled the jug out of the shield, and sure enough, pin 12 has
> separated from the thin strip that leads to the heater.
>
> Anybody have a spare CRT they might be interested in parting with?
>
> Thanks,
> Mark
>
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