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LF: Re: Pure off-topic: old tubes

To: <[email protected]>
Subject: LF: Re: Pure off-topic: old tubes
From: Petr Maly <[email protected]>
Date: Tue, 8 Jul 2014 15:44:12 +0200
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Hello Marco,

You are so kind. Thank you very much.
My tubes look exactly like 4B/551B(D). I will measure the dimensions to be sure as soon as I can.
It looks convenient that the filament voltage is the usual 6.3 volts.
Interesting is that they count with anode voltage as much as 10 or even 14 kV!
Thanks again for your effort.

73, Petr, OK1FIG


-----Original Message----- From: Marco IK1ODO -2
Sent: Tuesday, July 08, 2014 2:50 PM
To: [email protected]
Subject: Re: Fw: LF: Pure off-topic: old tubes


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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