If you have only 1 transformer and are building a guitar amp, please post on the instrument "board".
If you have a pair of O/P trafos to build a music reproduction amp, you can use the 6.6 KOhm primary "iron" usually used with 6L6s in combination with a PP EL84 pair. Set up for plenty of GNFB, L_RD knows, you have lots of magnetic headroom and need to compensate for a somewhat low load impedance. 8 KOhm primary "iron" is the norm for PP EL84s.
You can't use a PP O/P trafo in a PSE setup.
A mismatched transformer gives worse distorsion figures but it works.
That's precisely why I suggested GNFB, earlier.
The uploaded self splitting circuit can't obtain the full power capability of a PP EL84 pair. AAMOF, that design is good for approx. 4 WPC. The CCS in the cathode circuitry forces Class "A" operation. Also, the ultralinear mode leads to inadequate damping factor. Sorry, thats not a good design.
I have built the SIPP circuit and it sounds very good.
The CCS ensures 80mA of current is used and so it gives a good output level.
But will work with my 6l6 pp transformer?
It's not Class "A" that's an issue. Class "A" triodes are about 20% efficient. A Class "A" self splitting triode setup is 10% efficient. UL mode, as shown in the schematic, is more efficient than triode, but the 50% reduction in net efficiency, due to self splitting, holds true.
You can get the same great sound, along with 2X the power and 2X the efficiency by installing a phase splitter. It's not especially difficult to be technically correct and good sounding too.