That'd be my diagnosis too. Happens all the time with heatsinked parts, because the pins don't get hot enough to 'wet' properly when they go through the wave-soldering machine at the factory.
Thats what happens to boards, but I'm not saying that. Its the connections INSIDE the transistor that were going bad. Poking the transistors vibrated the internal connections. The only way to fix the problem was to install new transistors. These were the ones in the 5000 series for the vertical and horizontal drives.
greg
I wasn't arguing with you about the Tek parts, just talking about the likely cause of the OP's problem. ;^)
Which makes my point exactly ...
Arfa
Indeed!
I had this problem once a long time ago with another brand amp, a Proton, I think. Turns out I was putting a screw back in the wrong place. It was just long enough that when it was placed on its feet, it shorted to the circuit board.
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