? Transistors in Gray 150 A

[CollinsMan]

I just picked up a mint Gray 150 A, and was wondering what transistors it uses for power. The regular Gray 150 uses MRF 458s, but I can't find any information as to what the "A" model uses. The maroon vinyl-clad cover is still riveted to the case, and I don't want to drill the rivets out to find out, so I figured I'd ask the experts!

Thanks,

Steve

 

[histeel]

I do believe you can substitute a mrf 455.