[Amps] Bouncy Meter

[Pfizenmayer]

One thing that I found really helped "bouncy" brand new meters on a 
Centurion amplifier was to put a 3.9 volt zener across the meter terminals . 
(This obviously only works on a high resistance meter movement like these 
that are about 2380 ohms with FS of 1 ma so have about 2.3 volts across them 
full scale - a bonus is  meter protection as well.) What appears to be 
happening is the "forward" 0.7 volts diode in the zener conducts when the 
meter tries to swing back due to the reverese voltage and really damps the 
movement. Far superior to shunt capacitor approaches.

A lower voltage zener like 3.3  or even 2.9 would probably give somewhat 
better meter protection but 3.9 was what I could lay my hands on when I had 
the amp opened up.

 YMMV - Hank K7HP