[TechAssist] Re: RCA PTK195M2T tube isolation
- From: becyn <becyn@xxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 19 Apr 2005 11:37:05 -0400
HUH?????
First be sure what the problem might be.
make sure the 200v is present on the neck PCB ,
the K (cathode) load resistor is good and the drive
tranisitor isn't shorted or being driven into satuation
by some other problem.
If none of the above, you probably have a cathode to
heater short which will drag the cathode bias way down
thus driving the crt into saturation.
You can then:
a ) try isolating the the heater ( i never tried this on a PTV )
b) try "zapping" the short ( possible further damage)
c) replace crt
Jim McVey
McVey Alltronix
327 Broadway
Newburgh N.Y. 12550
"If it doesn't play...
CALL MCVEY !!!!!!"
Factory authorized
service for over 20
major brands.
845 561 8383
(Last of the Mohegans)
markbrock wrote:
>any one isolated the screen or what ever on these tubes ? this one has
>bright blue with retrace, real nice picture when they brought it in,
>played for couple days, now all blue, need a salvage gun or advise on how
>to isolate the short model is P61927
>thanks for all help and advise
>brock
>
>Brock Electronics
>R.R.4 box 237
>5208 cr.3385
>Independence Ks. 67301
>620-331-0235
>fax 331-7191
>
>markbrock@xxxxxxxxxxxxx
>Zenith*Philips*Peavey*Fender*Crate
>we work on all brands,makes,models
>of anything that plugs in the wall
>
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