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Petes' Blog
Published on by Joanne Smith
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Early Double Triodes (part two)
Early production sample of the LV12 with cock pit housing and connection.
Are these the earliest examples of a miniature double triode? Are these the forerunners of the the 12AX7?
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Development types, LV12, Museum pieces
Published on by Joanne Smith
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Early Double Triodes (part one)
Early developments of the LV12
Circa 1943 button construction double triode prototype. Countained within a side contact envelope with 8 pin round base connected inline to a comb support
Is this one of the forerunners of the 12AX7?
More about:
Development types, LV12, Museum pieces
Published on by Joanne Smith
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Mullard 1768
We have very little information on this valve, but believe it to be a double anode gas filled rectifier
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Mullard 1768, Museum pieces
Published on by Joanne Smith
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A bit of fun... What is it?
We came across this valve in an unmarked box. There are no markings on the valve, we are not sure what it is! If anyone has any ideas, post below. If anyone is able to help us identify it then we'll give you a credit to spend at our online shop as a thank-you!
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Museum pieces, What is it?, valve development
Published on by Joanne Smith
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Museum pieces: EBL1
Philips EBL1
Pair of mint condition Philips EBL1 from 1941. Both valves bear the code K611-AIF. Double diode audio output pentode, with CT8 side contact base.
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EBL1, Museum pieces, philips valve, valve development
Published on by Joanne Smith
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Museum pieces: Brimar Trustworthy ECC803S
Brimar 'Trustworthy' ECC803S
Extremely rare, Brimar 'Trustworthy' ECC803S -with carbon laminated box anode. The trustworthy ECC803S were assembled in 1969 at Rochester Aiport in Kent for long life telephone applications. The code on this particular tube is 3G6/977.
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12AX7, ECC803S, ECC83, Museum pieces, Trustworthy, preamp
Published on by Joanne Smith
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Museum pieces: Osram L30
L30 Made by Osram for the General Electric Company Ltd. of England
Originally made in 1938, this mint tube is the actual sample supplied to the BBC research department on 30th June 1939.
The L30 was approved 19th July 1939 and given the serial number 482202. Here are the test results;
We still have the orignal blue and gold box, which is in good condition despite its' age.
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Museum pieces, Osram L30, valve development
Published on by Joanne Smith
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Museum pieces: EL60
The EL60 is the true forerunner of the iconic EL34.
This tube was approved and placed in the Philips museum at Mullard in Blackburn and still has the entry code of Sept '50, the code on the base reads 57 M91.
Believed to have been made by Philips in Eindhoven. The valve itself has rounded anode plates, square micas with ceramic insulators. The structure is connected directly to the base and has radiators at the top and bottom of the tube (four in total). The major difference between the EL60 and the EL34 is the B9G base
We'll get some more photos posted shortly.
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EL34 forerunner, EL60, Eindhoven, Museum pieces, valve development