Re: Tubes question!

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Christoph Bohr" <cb-at-luebke-lands.de> 

Hello Kerso.

 > Yes one tube that didnt havee the markings had one  turn
arround the
 > flyback.
 > Well since I wont build anything out of them if sombody needs
them, contact
 > me :-).
These types are pretty worthless these days as
there are still tons of them out there. But
they are a good thing to keep in stock, don't
waste too much space and might be usefull
in the far future. I still have dozens of these types
but never had a use for them, the 300mA series filament
makes them hard to use in DIY projects unless you use
plenty of them at at time or want so waste power in resistors.
However, I am currently getting ready to try some of the
x-ray experiments that werde discussed on the list
over the last days with these tubes...

regards

Christoph


 >
 > Best Regards
 >
 > KReso Bukvic
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Saturday, October 02, 2004 10:41 AM
 > Subject: Re: Tubes question!
 >
 >
 >  > Original poster: "Christoph Bohr" <cb-at-luebke-lands.de>
 >  >
 >  > Hello Kreso.
 >  >
 >  > Finally some questions I can answer ;-)
 >  >
 >  >  > Biggest one is PL-519
 >  >
 >  > The PL519 is a Pentode used for horizontal deflection amp in
TV
 >  > sets.
 >  > It is pretty powerfull, very linear and can be used to build
a
 >  > VTTC or a RF amp.
 >  > There are CB-band amps out there that employ the EL519,
which is
 >  > the same tube,
 >  > only with 6,3V filament. ( the P stand for 300mA filament
used in
 >  > serial connection without
 >  > a filament transformer, thus all the tubes from one TV
should be
 >  > of the P type.
 >  > The PL 519 reaches 300mA around 40V,
 >  >
 >  >  > Then smaller one is PY-500A
 >  >
 >  > This is a "Zeilenschalter" tube whoch would directly
translate
 >  > into "line switch" which is
 >  > probably not the correct translation. It twitches the beam
off at
 >  > the end of a line until it reaches the next
 >  > starting point and then switches it back on.
 >  > Can be used to generate X-Rays as you can see from the other
 >  > thread the is currently running.
 >  >
 >  >  > The next one does not have any markings, but it-s top was
 >  > connected to a
 >  >  > flyback ( maybe a rectifier?)
 >  >
 >  > This is most probably a DY 86 or DY 88 which is a HV
rectifier
 >  > for the picture tube voltage and was
 >  > mountet very close to the Flyback. A funny thing is, this is
not
 >  > a P type but a D type that is also called
 >  > "battery tubes" as the filament voltage is only 1,4V. So
where
 >  > did the 1,4V come from?
 >  > It came from an extra winding on the flyback, OK I guess the
FB
 >  > can deal with the 0.84Watt extra power.
 >  > Max voltage is around 20KV at 22% duty cycle, max 18µS and
around
 >  > 150 to 200 µA
 >  > Can be re-used fo a small battery audion receiver or try to
 >  > generate X-Rays ;-) This is a high vacuum type.
 >  >
 >  >  > And the smallest is 3 letters - 3 numbers
 >  >  > Im not sure about first letter here ->OCF-802
 >  > This is a PCF 802 used in conversion transducer stages,
sometimes
 >  > the pentode system is used in the
 >  > intermediate frequency stage with UHF tuners. Filament is
300mA,
 >  > 8,5V.
 >  > I have no idea what this could be used for, maybe as preamp
and
 >  > phase inverter in a push pull
 >  > VTTC if such a thing is possibly....
 >  > BTW, this is a simple system: PCF802
 >  > P= 300mA
 >  > C= triode
 >  > F= pentode
 >  > 8= can mean linear, the rest is usually internal stuff.
 >  >
 >  > Congratulations, its alway good to safe this old stuff from
the
 >  > dumpster.
 >  >
 >  > regards
 >  >
 >  > Christoph Bohr
 >  >
 >  > Good luck and safe the tubes.
 >  >
 >  >
 >  >
 >  >
 >
 >
 >
 >