Good Day All,
wanting to bypass the internal SS amp of a leslie 825, so if desired can run a guitar amp into the speaker and use the combo pedal to adjust speed.  can I parallel an ext speaker jack to it?  Or should I use a shorting jack to disconnect the speaker leads from the internal amp?  If i just disconnect the leads and the amp is on will it damage the power amp?  I'll try and attach the schematic here. 
Thanks,  Matt

Howdy All,

First off, I've been coming here for info for awhile and decided to get on board.  Thanks to everyone in the past for the great advice & insights.

My current project in front of me is an older Peavey Centry (200 series),  that I've worked on before had a couple blown output devices (original RCA 62792)  with weird noise and shorting problems.  Turned out to be broken leads on the driver transformer, and several burned resistors that i think fried when the trans shorted. 

Got that dealt with and replaced the blown outputs.  Six months later, it's back with 2 more blown outputs, one on each side of the transformer.  One of them was another old one and one of the new ones I replaced (2n3055 from RatShack).  With those out the amp turns on and plays ok with the remaining two outputs, albeit at half power.  I know I probably should have replaced all four, but I didn't, lesson learned.

I said all that to say I'd like to use a more reliable higher rated transistor than the  2n3055, and I know from digging that there are options.  From a design standpoint, should I look for something that has a higher voltage rating (MJ15015), but simiilar current & HFE ratings, OR  a device that has higher specs in every catagory (ie MJ15001, MJ15003)? 
I want this to be more reliable for the player and not have it back every 6 months to replace the outputs.  As far as I can tell nothing else looks out of place voltage wise, and I'm chaulking this up to marginal parts.

Any thoughts, suggestions?
Sorry, I can't seem to find the schematic on line.  I have a paper copy in front of me***