12AX7A preamp tubes - ribbed vs smooth plate

I doubt there are 4 rectifiers that doesn't make any sense.

@jond 

You got lots of cool stuff. Maybe you have too many tubes in boxes. Why you have so many tubes?

4 12AT7 tubes. no clue what they do Beyond rectify. I know rectify transforms AC to DC and why you need four tubes to do that, dunno.

Hey emergingsoul I very well have too many tubes in or out of boxes that said the 12AT7 tube is not a rectifier tube.

"4 12AT7 tubes. no clue what they do Beyond rectify"

Your amp is SS rectified, not tubed.

2nd gain stage/phase splitter? Just guessing.

It's a mono block amplifier with 8 KT 88 and 6 small tubes (  4 rectifier, 2 preamp).

I assume the "2 preamp" tubes are the amps input tubes or driver tubes?