trouble reparing Marantz 1060

[davesnewTT]

Hi there,

I'm having some trouble fixing a marantz 1060 int. amp and was hoping someone here could help me.
When I got it, the left channel was heavily distorted. I narrowed the problem down to the power amp section, since the preamp seems to be working fine. I then recapped the power amp section as well as replacing the output caps and the big power supply cap. This fixed the problem, but when i hooked it up somewhere else a day later, the right channel sounded distorted?!
I then attempted to measure supply voltage and bias according to the instructions in this old post:
http://www.audiokarma.org/forums/showpost.php?p=2071800&postcount=25

Unfortunately, in my infinite stupidity i let the probe slip, which resulted in a spark at the tip of the probe, and some smoke coming from the board (I couldn't see which component).
Since then I've removed the board completely from the amp and started removing and measuring individual components, and found the following bad/out of spec components:
- R747 to R750 (I think these are called 'fusistors'? They're 0.24 ohm/2 watt resistors connected between the ouput transistors and output caps)
- R753 and R754 (10 ohm/2W)
- two diodes: H717 and H718 (1N60)
- one transistor : H709 (2SC959)

I also measured (before removing the board and bad components) a supply voltage of about 73 V DC, 34 V DC between ground and J715 and 52 V DC between ground and J716.

Right. So I guess my main question is if my problem is likely fixed by replacing the bad parts I found, or if there are other things I should measure first?
And if the first, does anyone know what to replace the diodes and transistor with? I can't find the originals online, so I guess they're out of production.
Many thanks in advance,

dave.

 

[EchoWars]

The large 0.24 ohm resistors are simply power resistors. The diodes are germanium and should be fairly easy to find, but you can also replace them with a Schottky diode, something like a BAT41.

The 2SC959 comes in a couple of package styles (TO-39 and TO-66). Replacement depends on which one you have.

 

[davesnewTT]

Thanks for the reply. Bit of a time difference here, so I didn't get round to checking this thread for much of the evening. I'll check on the different packages for the 2sc959's. They're about a 1/4" across, three pins down with the collector connected to the case, snow flake shaped glued on heatsink, and a plastic spacer between the case and the boards if that helps specify anything useful.
I take it from your reply that nothing can be said about a likely cause for the problem (apart from me screwing up with the probe of course:sigh
Anyways, thanks for the help, I'll get back if I get stuck or succeed:thmbsp:.

 

[EchoWars]

That would make the part a TO-39. A 2N3019 would work (but might not fit the heatsink), or you can move to a modern TO-126 style case with something like a Fairchild KSC2609A or Hitachi 2SD669, and a TO-126 heatsink for them.