ok so with Q4 removed the reading was as expected so Q4 now replaced and to be sure d13,14,q2,3,5 also.
I now get a hum when a guitar is plugged in, R97 doesn't get too hot but Q8 catches fire!! It literally glows.
I'm about to give up on this one unless anyone has any final ideas for me.

Doesn't appear to be any short. When Q4 is removed however R97 does not get over hot.

No Difference with C61 out of cct.

No other parts heating.
R52 is reading 10R so that's ok
Left end (junction with R98) reads around 2R to ground.
I will try lifting C61 and see if that makes a difference.

Well I'm getting sound out albeit very quiet but the resistor is running so hot it's melting it's solder joints so definately not right.

Ok quick update, Q2,3,4,5,6,7,8,9 now replaced. R97 is now drawing too much current through it.
Any ideas?

Thanks all to replies so far. As Tony mentioned Q5,6,7 & 8 are indeed blown. Can anyone suggest a likely cause? 220R feedback res across Q7 & 8 are ok as are  the various power resistors.

Hi all,
I have a Hartke A25 Bass combo that has stopped working.
Having checked the usual fuses etc (which were ok) I find that Q8 (output stage?) is a charred mess.
So firstly as type number is burnt off, does anyone know what type Q8 is so I can replace it and secondly what would the likely cause be for it to go in the first place?
Any help or even a schematic would be greatly appreciated.
Thanks in advance.