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From: hr(bob) hofmann on 15 Jul 2010 23:24
On Jul 15, 10:50 am, Meat Plow <mhyw...(a)yahoo.com> wrote:
> On Thu, 15 Jul 2010 11:20:03 +0100, N_Cook wrote:
> > Well that is what Avo calls it, I've never come across one before. ECC83
> > with curious cyclic swirling breaking-surf  whitish-noise and clicks.
> > Putting on Avo 160 tester showed <>short in A/R setting, I've never had
> > before,  A/R here stands for cold checking Anodes To Remaining
> > electrodes. DVM cold resistance checking pin to pin showed about 9K
> > between an anode and its grid. I will replace it but is there any point
> > in blasting with some high voltage to vaporize whatever is bridging, for
> > a known unreliable/short-term spare. I'm aware that a valve with leaky C
> > to H, then running the valve with 10 or 12V on the heaters insted of
> > 6.3V so they glow like bulbs for a few seconds, will knock back the
> > bridging deposit for a few months or even years.
>
> Used to do that with a TV CRT rejuvenator. It had a specific function to
> remove shorts. Sometimes worked, sometimes didn't.
>
> --
> Altopia.com $12/m 10 unlimited connections

Same here. I still have it and use it about once every couple of
years, now on monitors rather than tv crt's.
From: N_Cook on 16 Jul 2010 03:17
hr(bob) hofmann(a)att.net <hrhofmann(a)att.net> wrote in message
news:cbf6f387-58cb-47b1-b2c8-2f56b81e7a42(a)j8g2000yqd.googlegroups.com...
On Jul 15, 10:50 am, Meat Plow <mhyw...(a)yahoo.com> wrote:
> On Thu, 15 Jul 2010 11:20:03 +0100, N_Cook wrote:
> > Well that is what Avo calls it, I've never come across one before. ECC83
> > with curious cyclic swirling breaking-surf whitish-noise and clicks.
> > Putting on Avo 160 tester showed <>short in A/R setting, I've never had
> > before, A/R here stands for cold checking Anodes To Remaining
> > electrodes. DVM cold resistance checking pin to pin showed about 9K
> > between an anode and its grid. I will replace it but is there any point
> > in blasting with some high voltage to vaporize whatever is bridging, for
> > a known unreliable/short-term spare. I'm aware that a valve with leaky C
> > to H, then running the valve with 10 or 12V on the heaters insted of
> > 6.3V so they glow like bulbs for a few seconds, will knock back the
> > bridging deposit for a few months or even years.
>
> Used to do that with a TV CRT rejuvenator. It had a specific function to
> remove shorts. Sometimes worked, sometimes didn't.
>
> --
> Altopia.com $12/m 10 unlimited connections

Same here. I still have it and use it about once every couple of
years, now on monitors rather than tv crt's.


&&&&&&&

Any idea what is causing this A/G resistance? Nothing to loose, I will blast
it with some volts. But preliminaries I've seriously banged the envelope and
heated it with hot air and the resistance has hardly moved from 8.7K ohm.
C/H leakage I've never seen below about 100K IIRC and was highly variable on
knocking the envelope.


From: N_Cook on 19 Jul 2010 09:40
60V supply over A-G, dropped the resistance to 4.6K . Tried on a 500V
Megger, not expecting to do much as only battery powered. Small white flash
from inside and ohmage shot up to over 200M. Testing on valve tester and
checks out fine


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