dubwicht,
Normally one eiclone has a Hammond 274BX power tranny. This supplies 375-0-375 volts HV secondary @ 175 milliamps, 3 amps @ 5 vac , 6 amps @ 6.3vac. This is plenty for 2 EL34s (1.5 amps @ 6.3 vac each = 3 amps), the 6SN7 (0.6 amps @ 6.3 vac) and the 12AX7 (0.3 amps @ 6.3 vac).
To run 2 eiclones from one transformer you will have to feed 4 EL34s, 2 6SN7s and 2 12AX7s. This adds up to 7.8 amps @ 6.3 vac. You also need I would guess a minimum of 300 milliamps at 375-0-375 (750 vac) for the HV. The Hammond 278CX has plenty of HV at 400-0-400 @ 465 milliamps but is amost 2 amps short in the 6.3 vac department.
So the task now is to find a power tranny that has both the HV and current for two eiclones AND can supply the extra 6.3 vac for the tube filaments.
The toroid tranny Shannon mentioned is from
www.toroid.com , part number 236.5072. It has 360-0-360 vac @ 0.75 amps HV, two 6.3 vac @ 5 amp plus a 5 vac @6 amp filament taps in case you wanted dual tube rectifiers. It also has bias taps.
There is also the possibility of using the 278CX to feed just the EL34s and a separate small filament transformer under the chassis for the 6SN7s and 12AX7s. One could also feed the smaller tube filaments with a DC supply of some kind.
Mike's N-1 Rule: When looking for N number of components to finish a job, you have a 95% chance of only finding N-1 of them.