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Re: Fw: LF: Pure off-topic: old tubes

from [Marco IK1ODO -2] [Permanent Link][Original]
To: rsgb_lf_group@blacksheep.org
Subject: Re: Fw: LF: Pure off-topic: old tubes
From: Marco IK1ODO -2 <ik1odo@spin-it.com>
Date: Tue, 08 Jul 2014 14:50:09 +0200
In-reply-to: <1404815801.86408.YahooMailNeo@web173004.mail.ir2.yahoo.com >
References: <9FE61D98573D45E08A39735EF283914F@gmc.net> <53BAE6E9.3050206@tele2.se> <1404795548.36812.YahooMailNeo@web173001.mail.ir2.yahoo.com> <1404815337.38505.YahooMailNeo@web173004.mail.ir2.yahoo.com> <1404815801.86408.YahooMailNeo@web173004.mail.ir2.yahoo.com>
Reply-to: rsgb_lf_group@blacksheep.org
Sender: owner-rsgb_lf_group@blacksheep.org 
15 years ago I was used to buy truckloads of test and communication 
equipment from Johns Radio in Bradford (now he is in Batley).
He had a lot of equipment from the closure of STC R&D labs. I 
acquired many valve handbooks: AEI, GEC, STC, RCA, about 20 books.
I dug and found some data on a similar tetrode, possibly a newer 
version of 4B/55. I have 4B/550E, 4B/551B, 4B/551BD. It is in Volume 
2B, Components, of S.T.C.

Please find the scan in www.spinelectronics.eu/ftp/STC_tetrodes.pdf

Petr, do they look similar?

73 - Marco IK1ODO

















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