Luxman L3 38VDC On Speaker Output?

[Mooly]

Haven't got luck until now with oscillo.
I've tried to find out how important is hfe - dc gain on transistors.
Cannot find the answer on what is happening if u replace a transistor with abother one with identical name but with different specification. In my case all 4 transistors q403,404,405,406 are replaced with others with same name but with bigger hfe.

Gain of individual transistors shouldn't be a factor because those differences are ironed out by the action of negative feedback... so it really doesn't matter in a general sense whether a device has a gain of 50 or 250.

What sort of scope are you using? and what are you seeing? Edit... you mean you have had no luck getting a scope, not no luck using one.

You need the scope to be connected across the speaker output (be sure to get the polarity correct and the probe ground to the negative speaker terminal).