"Balanced power amp" option for Amps

[richards13]

Hi
I have no longer such a requirement, as I haved botched my KEL84 and i am quite happy with the result.
In case anyone is intrested:
Remove ECF80's and remove restistors from power line to them.
Replace 2.2k resistor on powerline with 1k, which was the ecf80 feed, connect this to string of 5W zeners to give 270V screen grid supply and connect amp in pentode mode.
replace first 100uF cap with 12uF motor start cap to drop 330 to 297volts on el84 anodes.
Feed balanced input straigh to grid reistors on el84's from dbx driverack pa.
dbx driverack can supply +20DBu, 7.7 volts which is not far from the 10V the cathodes on el84's are running at.
EL84's have a common 100ohm resistor into a 50ohm ww pot to balance dc on output valve pairs, with bypass capacitor.
The amp runs with no feedback, a trace of hum through Lowther DX2's, el84's which are matched on gain.
Its nice to be lucky, once in a while.
Naim Nap150x now sold, I had prefered it to the orginal KEL84 on the Lowthers.
The DBX Driverack filters all signal below 150Hz to sub-woofer, avoiding bodged KEL-84 and Lowthers. So I have no idea if this amplifier is any good in the bass, now the gobal feedback has gone.
Future maybe's, ecl-82 regulated grid supply and set-up input transformers.

Regards

Richard