Correct !
They were used in the very first Jap sets. Soon they went to normal numbers
& used mostly common US designed tubes.
https://www.radiomuseum.org/tubes/tube_6r-p22.html
73 Zeno
LFOD !
Quote:
Originally Posted by N2IXK
Properly called a 6R-P22, this is one of the Japanese "JIS" types that was used by Sears/Silvertone and others in the 1960s.
It doesn't have a direct EIA equivalent that I am aware of, as some of the JIS types do.
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