Smeggy Posted August 9, 2009 Author Report Share Posted August 9, 2009 on my se version the two grounds got to the two board ground connectors like they would if wired normally. A balanced pot though, dunno but I would have thought the wiring would have been the same doubled up but I've never looked at the connectors of one. I just assumed it would be the same as se with two sets of connector tags. Quote Link to comment Share on other sites More sharing options...
n_maher Posted August 9, 2009 Report Share Posted August 9, 2009 Gary, you could do a shunted pot exactly like the se version but it would take a 4 gang pot. The idea here is to use an se pot for balanced thereby saving a ton a cash. Quote Link to comment Share on other sites More sharing options...
Smeggy Posted August 9, 2009 Author Report Share Posted August 9, 2009 Ah, I see. Sorry, wasn't paying attention In that case I'm all over it as I'll be balancing my EHHA soon. Quote Link to comment Share on other sites More sharing options...
nikongod Posted August 9, 2009 Report Share Posted August 9, 2009 Are you using both channels (+/-) on the same board? IE left and right amps. Do you have the input caps in? I would ask tangent in a bit Quote Link to comment Share on other sites More sharing options...
Smeggy Posted August 9, 2009 Author Report Share Posted August 9, 2009 After this I'm going to be shunting the mini pot on the CTH, that should give a vast improvement. I may go dual pot on the EHHA as some of my phones have balance issues so that should help. Quote Link to comment Share on other sites More sharing options...
dBel84 Posted August 9, 2009 Report Share Posted August 9, 2009 now you need to start investigating the arena of OTT resistors for shunting ..dB Quote Link to comment Share on other sites More sharing options...
n_maher Posted August 9, 2009 Report Share Posted August 9, 2009 Are you using both channels (+/-) on the same board? IE left and right amps.Yes, I'm using both channels on the same board - one for L and one for R. The + connects to IR and the - to IL, the ground channel is not populated on either board (shouldn't make a difference that I can see). The power supply is a single TREAD feeding both boards and I've checked the voltages at the various pins of both the OPAL/R and BUFL and BUFR positions and all seems well there. Do you have the input caps in?Nope and I checked continuity across the pads to make the sure that the traces had not been cut. I would ask tangent in a bit I think I'm going to try jumping the pot out of the equation entirely and see what happens then. I have a source that can do digital attenuation so I shouldn't blow my fool head off. I would appreciate any suggestions for how to wire the input ground though (pin 1 on the XLRs), it's still unclear to me what the right connection here would be. Quote Link to comment Share on other sites More sharing options...
fierce_freak Posted December 10, 2009 Report Share Posted December 10, 2009 Would this work the way I think it would (allow proper volume control for switched rca and xlr inputs)? Quote Link to comment Share on other sites More sharing options...
nikongod Posted December 10, 2009 Report Share Posted December 10, 2009 Would this work the way I think it would (allow proper volume control for switched rca and xlr inputs)? That is how I run the inputs on my balanced OTL monster (the silver ghost). It works great for switching RCA & XLR with a differential pair input stage. Quote Link to comment Share on other sites More sharing options...
fierce_freak Posted December 10, 2009 Report Share Posted December 10, 2009 Awesome, thanks for the reply Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted December 10, 2009 Report Share Posted December 10, 2009 a differential pair input stage. yeah, that's probably the key part though. Quote Link to comment Share on other sites More sharing options...
fierce_freak Posted December 11, 2009 Report Share Posted December 11, 2009 Argh, I thought I'd seen people using the balanced shunt pot scheme with amps other than those with a differential pair input. Can anyone tell me whether or not the schematic I posted would work with the eXStata? Quote Link to comment Share on other sites More sharing options...
Pars Posted December 11, 2009 Report Share Posted December 11, 2009 I for one do not see how this could work fro a volume control... it looks like it just acts as a variable resistor between the two "channels", even if those are the same signal 180 degrees out of phase? I could also just be dense Quote Link to comment Share on other sites More sharing options...
Voltron Posted December 11, 2009 Report Share Posted December 11, 2009 Two pages into a thread entitled "Pot Shunting" and nobody has made a Dom joke? "Screw you guys, I am outta here!" Quote Link to comment Share on other sites More sharing options...
dsavitsk Posted December 12, 2009 Report Share Posted December 12, 2009 I for one do not see how this could work fro a volume control... it looks like it just acts as a variable resistor between the two "channels", even if those are the same signal 180 degrees out of phase? I could also just be dense I think you listened to an amp of mine using this sort of pot at the Chicago meet, if that helps you believe that it works. Quote Link to comment Share on other sites More sharing options...
Les_Garten Posted December 21, 2009 Report Share Posted December 21, 2009 Nate, since this thread got bumped. Did you get the two deck pot to work as a Balanced shunt vol control? You never updated whether you ironed it out or not. Quote Link to comment Share on other sites More sharing options...
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