single triode IDHT 4-5 British & other base

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ML4  GEC/Osram

http://www.r-type.org/pdfs/ml4-1.pdf

http://www.r-type.org/exhib/aaq0003.htm

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EC52 Mullard single triode Hi Mu

The EC52 is a small transmitting valve from the early days of all glass construction. It was designed for VHF operation, and probably mobile equipment. It was originally given the Type designation of .
The picture shows the flattened oxide coated cathode and the gold grid wire can also be seen. The anode is carbonized. The whole electrode assembly takes up less than half of the envelope, and a second valve could be physically fitted into the envelope.
The wide glass tube envelope is 30 mm in diameter and, excluding the B9G base pins, is 55 mm tall.

>>> http://www.tubecollector.org/cv1137.htm

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14A4 Sylvania //12J5   loctal base version

http://www.tubebooks.org/tubedata/Sylvania/1951/14A4-5722.pdf

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ML 6 Marconi

http://www.r-type.org/exhib/aac0035.htm

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12S3S / LD1  Svetlana  single triode  idht

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ML6/CV1105 Marconi ceramic base socket B5 british (ไม่มีที่ลงขอมั่วลงที่นี่ละกัน)