Help! Matching driver transistors for my Eight

My Eight has 3 different makes of transistors among the 4 drivers and 4 outputs. It sounds great......but I hate to see one side original and the other with 2 non original brands due to repair over time.

I had no problem finding replacements for the 4 outputs, all NPN Toshiba 2SC1079's now MJ21194G - so far so good

The original drivers are Hitachi's 2SA566 and 2SC680
The 2SA566 (pnp) has already been replaced with a TO-220 style MJE15033G by capable hands.

But what about the 2SC680 (npn)? Digikey does list a MJE15034G but the specs are different ?

Is that to be expected since once is NPN the other PNP - or to ask the question different, to get the best match which are the most important specs that must be in line betweeen the original and replacement ?

Thanks for your help.


P.s did order one of these - hoping that finding the B, E, C legs should be a breeze

http://www.pcs-electronics.com/atlas-semiconductor-analyser-model-dca55-p-1453.html

The MJE15034G is the compliment to the MJE15033G.If the 33G's are working fine. The 34G's should be a drop in replacement for the 2SC680's.

The Atlas is a very handy little gizmo.I really like mine..:thmbsp:

Thanks for info - Glad you like the Atlas, pretty excited about getting mine.

So are there any general guidelines for replacing old transistors with new - like which specs must be approximated in the new replacement in order to be a good match.