Inside on a cold weekend , and being grounded

OTL Asylum

OTL, Output Transformerless Amplifier User Group.

Hi Everyone ,Freezing here , but amps keep me warm (:-)
Should the Driverstage Common buss ( 0vdc ) be connected to the chassis ground ? I note that when following the proceedure in manual ..Checkout Proceedure section 2 ...states that measure from any unpainted chassis point and the caps +ve & -ve's rails respectively .I didnt get any voltage reading here , and since I was trying to track down a low level humm , I started to experiment with grounding.
I had one amp that was dead quiet , and another that wasnt . So I test both amps , and find that both are wired exactly the same ( they should be , I wired them ! ) ,,,but , confused only for a few seconds , I take my meter to the Driverstage common , and measure again ...this time I get the reaing I wanted ..+ 309.6 vdc or something like it . Since both amps were the same , but didnt sound the same , I moved onto the tubes . Swapping tubes around in the driver stage soon showed up what I wasnt ready for . Out of 8 Electro-Harmonix , I had 2 only that would be quiet when placed in Pos V2 or V1 ..with V2 being the most noticable . V3 & V4 didnt seem to have any impact , so they got the noisiest , actually I placed the noisiest in V3 . It seems I have 6 6SN7's with leakage in the Filaments ...and two that are alot better than the other 6 ! . Anyway , placing the best between the two amps , I now have two quiet DIY M60's again . BUT ..what about the grounding ?...my test were done with shorting out the RCA connection point , And I have mine modded permananetly for now to be SE , as I dont own any Balanced output preamp or source . Should the driverstage common buss be connected to the chassis ?? or is the manual instructions a typo , and was meant to say ' place your meter's Neg term on the Driverstage Common Buss , and the meter's Pos to the +ve & -ve rails where rectification has taken place .

http://i128.photobucket.com/albums/p174/satelliteman_2006/Driversupply.jpg (Open in New Window)

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Parts Connexion

Topic - Inside on a cold weekend , and being grounded - Satelliteman 02:15:53 07/06/08 (6)

Cold? - Ralph 13:32:37 07/07/08 (5)

RE: Cold? - Satelliteman 14:17:36 07/07/08 (4)

RCA input - Ralph 14:53:56 07/07/08 (3)

RE: RCA input - Satelliteman 23:46:17 07/07/08 (2)

RE: AC filaments - Ralph 12:57:16 07/08/08 (0)

RE: RCA input - cellai@space.it 02:19:23 07/08/08 (0)

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