Strange tube base

[Jim Hawkins]

Found a pack of unused tube bases which I don't recognize.
They're about the size of american octal, but with 9 pins spaced 36 degrees
and no spigot slot. There's no base of that type on my Avo Valve
Characteristic Meter
Anyone know what they might be ? CRT bases of some sort ?

Jim Hawkins

 

[Peter A Forbes]

On Wed, 16 Jan 2008 23:52:50 -0000, "Jim Hawkins" <jimhawkins@manx.net> wrote:

Found a pack of unused tube bases which I don't recognize.
They're about the size of american octal, but with 9 pins spaced 36 degrees
and no spigot slot. There's no base of that type on my Avo Valve
Characteristic Meter
Anyone know what they might be ? CRT bases of some sort ?

Jim Hawkins

9 pins wouldn't be enough for a Nixie, or a Decatron tube, but there are a lot
of other such stuff around. I'll check the old Mullard and RCA books and see if
anything comes close. we're off to Scotland on a commissioning trip this
morning, back tomorrow so will look on the weekend.

Peter

--
Peter & Rita Forbes
Email: diesel@easynet.co.uk
http://www.oldengine.org/members/diesel
http://www.stationary-engine.co.uk

 

[Bob Woodward]

Jim Hawkins wrote:

Found a pack of unused tube bases which I don't recognize.
They're about the size of american octal, but with 9 pins spaced 36 degrees
and no spigot slot. There's no base of that type on my Avo Valve
Characteristic Meter
Anyone know what they might be ? CRT bases of some sort ?

Jim Hawkins



It's MAGNOVAL

Used in Europe mainly for Television Line-driver tubes.
Like a large noval.

Robert

 

[mc]

It's MAGNOVAL
Used in Europe mainly for Television Line-driver tubes.
Like a large noval.

Robert

Picture here:
http://store.triodestore.com/magnocer.html

It does look like an octal socket with a ninth pin and no index slot on the
central hole. I presume the central hole is for a glass protrusion from the
tube envelope rather than from an actual plastic prong like on an octal
tube.

 

[Michael A. Terrell]

mc wrote:

It's MAGNOVAL
Used in Europe mainly for Television Line-driver tubes.
Like a large noval.

Robert

Picture here:
http://store.triodestore.com/magnocer.html

It does look like an octal socket with a ninth pin and no index slot on the
central hole. I presume the central hole is for a glass protrusion from the
tube envelope rather than from an actual plastic prong like on an octal
tube.

Yes, some of the magnoval tubes had the evacuation stem at the base
of the tube.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Jim Hawkins]

"mc" <look@www.ai.uga.edu.for.address> wrote in message
news:IiKjj.76009$K27.37660@bignews6.bellsouth.net...

It's MAGNOVAL
Used in Europe mainly for Television Line-driver tubes.
Like a large noval.

Robert

Picture here:
http://store.triodestore.com/magnocer.html

It does look like an octal socket with a ninth pin and no index slot on
the central hole. I presume the central hole is for a glass protrusion
from the tube envelope rather than from an actual plastic prong like on an
octal tube.

That's the one!
I see it's the base for the EL509 (original version, not the re-engineered
one, which is on a standard US octal)
Thanks very much for the reference.

Jim Hawkins

 

[Joerg]

Jim Hawkins wrote:

"mc" <look@www.ai.uga.edu.for.address> wrote in message
news:IiKjj.76009$K27.37660@bignews6.bellsouth.net...
It's MAGNOVAL
Used in Europe mainly for Television Line-driver tubes.
Like a large noval.

Robert
Picture here:
http://store.triodestore.com/magnocer.html

It does look like an octal socket with a ninth pin and no index slot on
the central hole. I presume the central hole is for a glass protrusion
from the tube envelope rather than from an actual plastic prong like on an
octal tube.



That's the one!
I see it's the base for the EL509 (original version, not the re-engineered
one, which is on a standard US octal)
Thanks very much for the reference.

These were mostly used for the PL509 and PL519 in horizontal flyback
stages of European color TV sets. 300mA filament current. The usual
bakelite bases would become charcoal over time because these tubes
dissipated around 30 watts, and they needed all the air flow they could get.

--
Regards, Joerg

http://www.analogconsultants.com/