by Category 5 » Mon Oct 11, 2004 9:34 pm
The A12 actually has an extra output winding on the secondary of the output transformer that could be easily used to drive a full on meter. The only problem I see is stepping voltage down to give the meter 15 volts instead of the 27 from the PSU.
Don't know about the N72 and J99 but my guess is that tapping the secondary to drive a meter would probably cuase distortion on the output.
Shane