It is not just a question of whether grid-leak bias will work (at all), but how well. I have no reliable model for the ECC83 for Spice, but my Philips Tube Data Sheets show the following comparative data. (The ECC83 is quite similar to the triode of an ECL86).
In all cases the H.T. is 300V, Ra=100K, Rg1 (next stage)=330K, and choice is for approximately equal Ia. Output (signal) voltage is given for quality work, i.e. just before onset of grid current (in that sense maximum):
1. With own Rg1=10meg and gen.resistance=330K:
D=5% at 6Vrms out, Ia=1.23mA, A=50
2. With own Rg1=10meg and gen. resistance=100 ohm:
D=2% at 30Vrms out, Ia=1.29mA, A=54
3. With suitable cathode bias (Rc=1,5K bypassed):
D=3,7% at 30Vrms out, Ia=1,11mA, A=57
Other moderately high mu triodes and pentodes show similar figures.
The question comes up: Why this almost fixation with the ECC83 in this type of circuit in many power amplifiers? If one insists on this, the ECC81 will be considerably better, at the penalty of slightly lower gain. But there still remains the matter of Miller capacitance for the first stage, unless a low input impedance (lower than most volume controls seen there) is used. With due respect for other designers, I rather fear that the operation of the ECC83 is not well understood if used in this application, at least for uncompromised quality. Spectrum analysis (harmonic content) of such instruments is revealing.
This explains my choice of a pentode-triode (moderate gain) here, as said. Yes, if one wants to use the ECL86, making use of the given triodes, than condition 3 above. The grid-leak bias method is to my mind specifically for low output conditions (pre-amplifiers), under the above conditions, because a low enough feed impedance is not always feasible (certainly not another ECC83 triode, anode fed).
Gold_xyz,
I would use an ECF80 or ECF82 for your case, with the triode drawing several mA so that it can use Ra=Rc=22K or so. But as others have said, there are better circuits - either an extra double triode driver, or the long-tail pair (Schmitt) phase inverter. Personally I don't feel the saving of an extra tube in a circuit of this total cost is merited. One is then looking at say an EF86 and ECC81/ECC88 or similar.
Apologies for a rather lengthy comment, but it might be worthwhile to get matters clear before choosing - at least my take.