hifitubes
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Also, the 4689 ...
" The 4689 was used in Cinema amps, PA systems and PTT applications.
It reached the market in the ST shape around 1936, and in the shape shown around 1947.
It can be used like an EL34, IF you keep Qa below 18W, Ua below 400V and Ug2 below 300V - the datasheet is a bit conservative wrt voltages - but power ratings MUST be observed...
Run a 4689 at EL34 operating points and voltages, and you will loose it fairly quickly. "
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