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| 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 |
| In-reply-to: | <[email protected] > |
| References: | <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
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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