To replace the 2N2148:

I used a 2N4905, but an MJ15016 might work too.

Replace D3/D10 with a germanium 1N34A.

Use one si + one ge diode for D1+D2.  If the output has crossover distortion
then use si + si.  If more is needed, then use si+si+ge.

Keep a ge transistor for Q1 & Q8.  Use 1N1307 if you cannot find a TIA02.

MJ15015G transistors work well for output.  Don't use really old MJ15015's, they
have much lower fT.

Note that my amps have no C6/C18 .001 uF capacitors as shown in the blueprint schematic.  
This may have been a tuning factor when using different parts (transistor types.)