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RE: Which version of the M60 do you have? It makes a difference.

Thank you so much for the information.

So, here is what I am gathering for the M-60' Mk 3.3 version;

The best tubes should go at the 2 rear left and right positions. The rear middle position is not affected as much by the tube quality and therefore there is not much need to use (boutique Sophie)tubes in that position. Actually the Sophie's are wider and it would be impossible to fit 3 of them across the back row.
And the front center tube should be a 6SN7GTB per Ralph at Atma-sphere.

Does that sound like I got it?

Edits: 03/26/17

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