Phase Inverters and Drivers

[jon]

I am currently planning on building an amp with a pair of 6146 power tubes. 700'ish volts on the plates and 200-250 Volts on the screens. I have seen many PI and driver arrangements for these tubes. As most of these designs are hifi based I was wondering what the best set up would be for a guitar amp. The arrangements I've seen so far are Cathodyne into an anode driver into a cathode driver (acrosound 1955). a Williamson style with a gain stage cathodyne into an anode driver. Obviously the SVT style. And I've also seen a transformer coupled setup with a 6V6 driving the interstage transformer. Would a twin style LTP into a anode or cathode driver be better?

[tubeswell]

I am currently planning on building an amp with a pair of 6146 power tubes. 700'ish volts on the plates and 200-250 Volts on the screens.

Not familiar with these tubes, but 700V seems inordinately high for typical Audio Frequency pentode operation according to the RCA datasheet https://frank.pocnet.net/sheets/049/6/6146.pdf

I have seen many PI and driver arrangements for these tubes. As most of these designs are hifi based I was wondering what the best set up would be for a guitar amp.

If the g1 voltage is around 40-50V, then maybe a cathodyne splitter with plate driven 12AU7 buffer stages would work well. Put a 'MV' in front of the cathodyne driver to enable the headroom to be adjusted to taste - (like the 'preset gain' in this old Jansen Bass75 schematic, and I only suggested that because this amp is designed to run 7027As at 600Vish, which seems to be similar to your concept)