Is it balanced?? I need help and kinda pronto-like...

[sweetbeats]

Otto, there were three flavors of plugin modules, the mic tranny, balancing tranny, and impedance matching tranny. If I'm looking at the schematic right it is unbalanced without a module.

Steve, look at the number on the plugin module but my guess is it is just a balancing transformer and not the mic pre transformer. The balancing transformer is round...the mic tranny is square. Also, the dummy plugs just bridge two pairs of the octal socket terminals...the details are in section 6 in your manual on the pag with the electronics schematic...you can use an empty octal socket from a tube or make some jumper pins out of solid core copper wire. Let me know if you can't find the details in the manual.

 

[SteveM]

Thanks Cory, I will check it out again.

 

[ofajen]

Otto, there were three flavors of plugin modules, the mic tranny, balancing tranny, and impedance matching tranny. If I'm looking at the schematic right it is unbalanced without a module.

It's been a while, so I checked the AG-440B manual (thanks AnalogRules) and yes, you are right, the input connection would be unbalanced with an input impedance of 100K with the "dummy plug" or balanced with the "bridging transformer" plug with an input impedance of 20K. I had the balancing transformers on mine, and I forgot that they were optional.

On the output side, there are transformers, but of course, you can either tie pin 2 to ground and run it unbalanced or leave pin 2 active and run a balanced line.

I believe the earlier AG-440s had a similar setup regarding I/O.

Cheers,

Otto