In Reply to: voodoo posted by Lew on December 16, 2011 at 07:18:49:
With power OFF, take your ohmmeter and see whether there is any resistance between the two phases at the anodes (or plates) of the phono input stage. (If you can identify the plate resistors for the dual-differential cascode, place the probes where those resistors go to the anodes of each half of the upper tube in the cascode.) R should equal roughly 2X the value of each plate resistor, because the meter will see them in series since they both connect to B+ (or maybe the reading will be dominated by some resistive components in the RIAA). If R = 0, there is continuity between the two phases which would cancel the output signal entirely.
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