Mullard CV66 triode (EC54, RL37)
The RL37 was developed by Mullard after STC developed grounded-grid triodes which were superior in performance at 200MHz to the RL7 (EF54). The RL37 was not as good as the STC valve but was more suited to 200MHz circuitry. It was found that an RL37 in front of an RL7 gave around 3.5dB improvement in the overall noise factor (the STC CV53 gave a 4dB improvement) and it was type approved as CV66.
A view of the base, plus the Mullard and EC54 markings.
This file was last modified
15:01:48, Tuesday September 02, 2014
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