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When you replace the transistors you should change all 4 of the C5707 transistors. You also need to resolder all of the connections to the 4 output transformers and the 4 output plug connections. If you did not resolder the these additional connections then the new transistors you install are more the likely dead now. The solder joints can crack because of the current and this causes the circuit to pull more amps than the transistors can handle. The new ones will blow within 2-3 seconds if you did not resolder the other connections.
Through my past experience I mwould remove the solder point at the input power B+ line to primary winding FBT. If the HOT has shorted there will be no power.Straight to the point if you know where the HOT is , you can desolder the middle pin or collector of the HOT transistor. If you desolder the pin which result the power led light turn up. That indicates either FBT or HOT has shorted