Quote:
Originally Posted by paulsherwin
The Germans did seem keener on EAA91s than anybody else.
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Looking the other way, did Mullard/Philips act as early adopters of the "US format" EB91 with its taller, 6AL5-style envelope, whilst Telefunken et al continued with production/usage of the 0.2A heater EB41 in an environment where Rimlock had been popular and established for some years including in VHF/FM receivers? When Rimlock was finally pushed aside as B9a (particularly) became dominant, it might have seemed sensible to standardise on a B7g double diode, the short and recently introduced EAA91 looking favourable over the established EB91.
The postulation that the EB91 was introduced in its taller envelope simply on the grounds that it enabled common envelope processing and handling over a range of B7g types seems reasonable from the production engineering viewpoint, which of course raises the question- what was the point of the EAA91's appearance?