tony sayer wrote:
In my earliest work days I designed colour TVs. We had an X-Ray
detector permanently covering the bench, because if the line output
valve got a few too many volts, and a bit too much current, its anode
would start to glow red, and X-Rays would come flooding out.


Wasn't that the shunt stabiliser that did that?.

Hence the metal can in some sets?..


Yep, like the PD500, but that would normally be running a bit higher
than 1kv AFAIK.

--
Nick

On 2007-08-08, Don Pearce wrote:
On 08 Aug 2007 09:30:25 GMT, John Phillips
wrote:
For which reason Scientific American is now rather boring. I sometimes
wish we could still see articles on making 2-metre-long zinc powder and
sulfur (sic) powered rockets that could reach 1,000 metres, etc.

And don't forget the instructions for making Tesla coils. Happy days.

Indeed. And things like the 1 MWatt pulsed-UV nitrogen laser.

It seems like articles of the sort were the making of today's engineers.
Nowadays for budding engineers it's a matter of cutting "dangerous" code
instead of winding coils. And even that may be outlawed by emerging
statute.

Maybe (to return to the topic) homebrew tube amplifiers is one of the
right engineering playgrounds for today.

--
John Phillips

John Phillips wrote:
On 2007-08-08, Don Pearce wrote:

On 08 Aug 2007 09:30:25 GMT, John Phillips
wrote:

For which reason Scientific American is now rather boring. I sometimes
wish we could still see articles on making 2-metre-long zinc powder and
sulfur (sic) powered rockets that could reach 1,000 metres, etc.

And don't forget the instructions for making Tesla coils. Happy days.


Indeed. And things like the 1 MWatt pulsed-UV nitrogen laser.

It seems like articles of the sort were the making of today's engineers.
Nowadays for budding engineers it's a matter of cutting "dangerous" code
instead of winding coils. And even that may be outlawed by emerging
statute.

Maybe (to return to the topic) homebrew tube amplifiers is one of the
right engineering playgrounds for today.


Could be some truth in that, I spend my working day writing code, so
playing with valves appeals to the same thing that made me do the sort
of (now) entirly inappropiate things I did as a kid.

--
Nick

"Don Pearce Posturing Pommy Prick "


In my earliest work days I designed colour TVs. We had an X-Ray
detector permanently covering the bench, because if the line output
valve got a few too many volts, and a bit too much current, its anode
would start to glow red, and X-Rays would come flooding out.


** Absolute ********.






........ Phil

"Don Pearce Posturing Pommy Prick "


I can't remember the anode voltage we were running back then, but I'm
pretty sure it was closer to 1kV than 5.



** Irrelevant which - neither can be responsible for x- ray generation.




........... Phil

"Don Pearce Posturing Pommy Turd "

tony sayer

In my earliest work days I designed colour TVs. We had an X-Ray
detector permanently covering the bench, because if the line output
valve got a few too many volts, and a bit too much current, its anode
would start to glow red, and X-Rays would come flooding out.

Wasn't that the shunt stabiliser that did that?.

Hence the metal can in some sets?..

No, definitely the line output valve.



** Another absolute BLOODY LIE !!

Only tubes supplied with 16 kV or more are at all involved in x-ray
generation.





.......... Phil

Phil Allison wrote:
"Don Pearce Posturing Pommy Turd "

tony sayer


In my earliest work days I designed colour TVs. We had an X-Ray
detector permanently covering the bench, because if the line output
valve got a few too many volts, and a bit too much current, its anode
would start to glow red, and X-Rays would come flooding out.

Wasn't that the shunt stabiliser that did that?.

Hence the metal can in some sets?..

No, definitely the line output valve.




** Another absolute BLOODY LIE !!

Only tubes supplied with 16 kV or more are at all involved in x-ray
generation.





......... Phil




I couldn't remember just what the voltage was, but I was sure its more
than 1kv.

--
Nick

On Wed, 08 Aug 2007 12:38:47 +0100, Nick Gorham
wrote:

Phil Allison wrote:
"Don Pearce Posturing Pommy Turd "

tony sayer


In my earliest work days I designed colour TVs. We had an X-Ray
detector permanently covering the bench, because if the line output
valve got a few too many volts, and a bit too much current, its anode
would start to glow red, and X-Rays would come flooding out.

Wasn't that the shunt stabiliser that did that?.

Hence the metal can in some sets?..

No, definitely the line output valve.




** Another absolute BLOODY LIE !!

Only tubes supplied with 16 kV or more are at all involved in x-ray
generation.





......... Phil




I couldn't remember just what the voltage was, but I was sure its more
than 1kv.

Well, this chap is aware of the phenomenon too

http://www.penders.cwc.net/otltbeht.html

Here too

http://www.r-type.org/exhib/aah0027.htm

d

--
Pearce Consulting
http://www.pearce.uk.com

"Don Pearce = ****ing LIAR "


No, definitely the line output valve.


** Another absolute BLOODY LIE !!

Only tubes supplied with 16 kV or more are at all involved in x-ray
generation.



Well, this chap is aware of the phenomenon too

http://www.penders.cwc.net/otltbeht.html

Here too

http://www.r-type.org/exhib/aah0027.htm




** Neither backs up the idiotic LIE posted by Don Pearce

The second link is for a regulator tube rated at 25kV !!!

Don Pearce = Lying Pommy Turd.






........ Phil

Don Pearce wrote:
On Wed, 08 Aug 2007 12:38:47 +0100, Nick Gorham
wrote:


Phil Allison wrote:

"Don Pearce Posturing Pommy Turd "


tony sayer



In my earliest work days I designed colour TVs. We had an X-Ray
detector permanently covering the bench, because if the line output
valve got a few too many volts, and a bit too much current, its anode
would start to glow red, and X-Rays would come flooding out.

Wasn't that the shunt stabiliser that did that?.

Hence the metal can in some sets?..

No, definitely the line output valve.




** Another absolute BLOODY LIE !!

Only tubes supplied with 16 kV or more are at all involved in x-ray
generation.





......... Phil




I couldn't remember just what the voltage was, but I was sure its more
than 1kv.


Well, this chap is aware of the phenomenon too

http://www.penders.cwc.net/otltbeht.html


"The PD500 is also shielded. Not only does this valve dissipate 30 Watts
but it also emits X-Rays"

That will be the valve with its anode connected to the 25kv EHT line I
guess.

Here too

http://www.r-type.org/exhib/aah0027.htm


And that will be the valve with a max Va of 25kv

d


I am not suggesting that the valves mentioned can't produce x-rays, but
I am certain that a gm70 won't with 1kv on its anode.

--
Nick