Engineer wrote:

"at" wrote in message
...
Hi,

Ok, I've spent time designing my amp with an experienced designer.

(snip)

The amp is going to have either a transformer phase splitter, or a
split
load phase splitter. Well, that's what has been suggested to me.
This is the
only designing question left, what kind of phase splitter to use.

Have you considered this phase splitter.

http://www.bonavolta.ch/hobby/en/audio/el84_7.htm

This was a very nice little amplifier in its day (I built two.)

Yes, this amp, which is very similar to a Mullard design
has a simple pentode input with 12AX7 LTP, and is ok where
a tiny drive voltage is needed, but the driver circuit is right out
of its depth for a pair of 300B.
6SN7 or trioded 6V6 or EL84 are then required for the 300B.

Or possibly a couple of 6SH7 of 6BX6/EF80 for a circuit like the Quad
40.

Patrick Turner.



Cheers,

Roger