I received the repaired DM10 back from Adelaide and re-inserted it in my system.
I must admit that even before testing it.....I was 90% sure that the turntable 'ground' to one of the DM58 Monoblocks was indeed the problem?
All the symptoms fitted including the 'coup de grace' when I placed the solid copper 1.8Kg Micro Seiki Cu180 'mat' under the TT-101 in direct contact with the metal base of the cage.
Without understanding electrical theory........I assume the potential voltage difference was increased enormously by this action which explains the fact that when I turned on the preamp........there was an immediate 'explosion' (even though the volume was turned down) which 'blew the chokes and capacitor?
I disconnected the 'ground' wire and placed the LOMC FR-7f cartridge and turned up the volume gradually.
Although there was a low 'hum' as the volume increased.......there was no 'feedback loop'.
I then connected the devilish 420STR, placed it on the vinyl and gradually increased the volume.
No hum and no 'feedback loop' even when the volume was at maximum!?
Problem solved.......and as so often occurs.......I was the problem!!? :-(
I must admit that even before testing it.....I was 90% sure that the turntable 'ground' to one of the DM58 Monoblocks was indeed the problem?
All the symptoms fitted including the 'coup de grace' when I placed the solid copper 1.8Kg Micro Seiki Cu180 'mat' under the TT-101 in direct contact with the metal base of the cage.
Without understanding electrical theory........I assume the potential voltage difference was increased enormously by this action which explains the fact that when I turned on the preamp........there was an immediate 'explosion' (even though the volume was turned down) which 'blew the chokes and capacitor?
I disconnected the 'ground' wire and placed the LOMC FR-7f cartridge and turned up the volume gradually.
Although there was a low 'hum' as the volume increased.......there was no 'feedback loop'.
I then connected the devilish 420STR, placed it on the vinyl and gradually increased the volume.
No hum and no 'feedback loop' even when the volume was at maximum!?
Problem solved.......and as so often occurs.......I was the problem!!? :-(