Big and old vaccum tubes

[Marcin]

I got these vaccum tubes.

They are huge (15 and 17cm), NOS and without descriptions - only serial number on each (inside). I have no idea about them (type, kind, model).

Do you know where to get info about them ?

[gekaufman]

Frank's Electron Tube data Sheets:

http://frank.pocnet.net/

or/

http://www.mif.pg.gda.pl/homepages/frank/vs.html

Frank might even be close to you!

- Gary

[Marcin]

Thanks for the link !
Polish professor lives 120km from me I have wrote an email to him.

[rjluna2]

The second tube looks like direct heat high power triode to me

[gekaufman]

Actually may be indirectly heated, looks like a sleeved cathode at the top of the tube.

Construction looks Eastern European or Russian, and neither are familiar. They may also be unfinished, as the carbon plate tube is similar in construction to some Eimac type, but without the typical base. Might be a 3-500z without the base/bottom pins added.

[rjluna2]

Oh I see

[Marcin]

Thanks to professor and electronic forum member - these are :
WF RFT SRS360 300W semipower transmitting triode
WF RFT SRS326 650W semipower transmitting triode

I was lucky buying two full boxes of new ones in Germany.

[gekaufman]

Well I was wrong, the SRS326 is directly heated....

Looks like the pins are wrong on the SRS360.

[rjluna2]

Yeah, two pins for heater element and one pin for the grid. The anode is on the top. That is for the second tube.

[Marcin]

I made mistake with power desriptions :
WF RFT SRS360 650W
WF RFT SRS326 300W