M3 Line preamp deep noise/ parts identification

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Hi all
Some months ago i observed a strange deep sound coming from the loudspeakers after M3 was "heated" enough. The sound was a deep strong heartbeat like noise. The music didnt stop but the sound was there without a typical repetition pattern (intermittent). First i spotted that it came from M3 (by replacing it temporarily). I ve also changed all valves with spare ones but in vain.
After optical survey i ve seen a polystyrene capacitor not in good shape on the M3HTR PCB (12/01/2004)(right next to the choke in front of the Transf2).Can somebody identify what is the capacitance/voltage of this capacitor(C103)[ and what is the exact type (and role) of the CTR101 transistor kind of thing connected with wires to the PCB. Is there a diagram of the circuit available? Because after replacing the capacitor with a new [620pF, 630V]i had a small explosion with victim the CTR when connected to mains.Any suggestions also of what else i have to check and replace?
Thanks in advance - kteg

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Topic - M3 Line preamp deep noise/ parts identification - kteg 14:17:41 10/21/13 (2)

RE: M3 Line preamp deep noise/ parts identification - astrostar59 07:34:44 10/30/13 (0)

AN Kit or M3 factory build? - mbhcid 14:02:24 10/22/13 (0)

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