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

To: [email protected]
Subject: Re: Fw: LF: Pure off-topic: old tubes
From: Marco IK1ODO -2 <[email protected]>
Date: Tue, 08 Jul 2014 14:50:09 +0200
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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

Petr, do they look similar?

73 - Marco IK1ODO

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