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NEC 7 pin tubes in a guitar amp


I recently acquired a mid to late 60's Marco Polo (Japanese) guitar amp. It uses 7 pin tubes throughout but I've not been able to find any information on these tubes and I hope someone here can help. The tubes are:

Preamp/tremolo: NEC 4Y
Power amp 1: NEC 4X
Power amp 2: NEC 48

Note that the 4X and 48 look identical.

Any information you may have would be greatly appreciated. Equivalents? Pin outs? Etc.


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Topic - NEC 7 pin tubes in a guitar amp - 12string 10:47:33 06/22/08 (4)


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