Re: "Audio" Valves
It gets even worse. Baxandall designed his famous tone control around the Mazda SP61, a high-slope TV RF pentode, although he concded that where less exacting results were acceptable, lesser valves such as the ECC40 could be used.
The SP61 was predecessor to the Mazda 6F13 which was followed by the 6F1. These two were broadly similar to the EF42 and EF80 respectively in the Philips series. I think that means that the EF80 now has its invitation to the audio party!
Cheers,
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