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In Reply to: RE: Monoblock Microphony posted by richardcooper2k on January 15, 2008 at 13:31:51
No quick way to say all this but tapping LH mono repeats through speaker (sensitive enough for karaoke!!). Had to be 6SH7 &/or 300B picking up vibrations all voltages OK so temporarily mechanically isolated (suspended) front insert panel c/w 6SH7/300B and attached components away from chassis - tapping chassis then had no effect. Clearly valves picking up vibs - so then swapped whole front insert panel c/w 6SH7/300B & attached R's & C's with same from RH mono but problem stayed with LH mono. So valves etc OK. Ended up swapping every component except mains Tx and HT section from the RH to the LH mono & problem stayed with LH mono. So swapped HT section (2 x porcelain stand off's with attached 5 x resistors & 3 x caps)and the problem transferred to the RH mono. Eureka!! - I then swapped all HT R's & C's between RH & LH mono leaving stand offs in place & the problem stayed with the RH mono. Weird!! so to be sure I then swapped the complete HT section of 2 stand off's and attached components between RH & LH mono and the problem transferred back to the LH mono. Must therefore be stand off(s) (??????????) - visual check reveals nothing odd and they measure oc. Have just received 2 x new stand off's in post does not seem possible they will fix problem but watch this space..............
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