Luxman L-507 restoration

When you see smoke from your amp, it's rarely a simple fix. 2 fried resistors and a capacitor are the obvious signs

One of these original output transistors  had shorted, sending 80V all over the amp and frying everything in its path

Outputs replaced with modern equivalents that are a lot more reliable 

Replaced all capacitors on the problem power amp board and installed some new trimmers but there was still high DC voltage where it shouldn't be

One of the driver transistors was partially failed so replaced both with modern TO-220 replacements as the original TO-66 package is no longer made. Swapped out the other 3 transistors with TO-220 units  to test

Ended up re-installing the 3 other transistors with the square heatsinks attached as they checked out fine and are very reliable