5U4 s
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ROGERS 5U4
Vintage 1957 5U4
MARCONI CANADA
Brown base 5U4G
USA 5U4
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Common to medium powered amps like the earlier Fender Super Reverbs and  Bandmasters. May be used replaced a 5Y3 for improved dynamics and power.  Also some players have replaced their 5AR4 with the 5U4 in their Vox AC30  amps to reduce heat and extend the life of the power tubes, some recommended  this as a "stability enhancer", if you can live with the slightly lower  power.
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