Fw: LF: Pure off-topic: old tubes

[M0FMT <m0fmt@yahoo.co.uk>]

Blyme I'm having fun with this try again  Please see attachement below.>>>>>>>>>>>>>>>>>>>
 

Hi all this may help with codes but don't trust it this is out the STC designers guide 1947. When I was five..... :o( 

73 es GL Pete M0FMT IO91UX

----- Forwarded Message -----
From: M0FMT <m0fmt@yahoo.co.uk>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Sent: Tuesday, 8 July 2014, 5:59
Subject: Fw: LF: Pure off-topic: old tubes

Hi all

 I like Johan went to my favourite online resources but nothing. I looked in http://www.tubebooks.org/technical_books_online.htm where an old STC catalogue lists every number either side of the "4B" range .... very frustrating!

If anyone has out of copyright radio or audio books, manuals and catalogues there can be no better place to send them too than Pete Millett, details on the website.(an incredible labour of love).

73 es GL Pete M0FMT IO91UX

----- Forwarded Message -----
From: Johan Bodin <jhbodin@tele2.se>
To: rsgb_lf_group@blacksheep.org
Sent: Monday, 7 July 2014, 19:28
Subject: Re: LF: Pure off-topic: old tubes

Hello Peter,

I expected to find the tube at http://www.tubedata.org/where Frank
Philipse has been collecting tube data sheets for 15 years but it wasn't
... It must be a very exotic tube!

73
Johan SM6LKM

Petr Maly skrev 2014-07-07 09:20:
> Hello all
> 
> I apology for the off-topic. However I know that this group is attended
> by very experienced gents, mainly from the UK.
> I found these two tubes in the junk, see the attachment. I spent quite a
> while to search the whole Internet for some specs, in vain.
> They are very similar to QB3/300, or TESLA’s RE125, same size, same
> socket. The only visible difference is the shape and material of the anode.
> I think the number 55 in the designation could possibly be the anode
> dissipation.
> The labels are:
> STC 4B/55
> ITT 4B/55/B
> By some lucky chance does anybody have any information about them?
> 
> Thanks, 73, Petr, OK1FIG
> 
> 
> 

STC valve data coding structure circa 1947.jpg
Description: JPEG image