The VAC Phi Alpha and Phi Beta preamps were from a similar build timeframe for VAC and in their manuals it states the following:
“Meter: Indicate the operating voltages within the unit. This will vary somewhat due to fluctuations in power line voltage.”
Very nice unit. I have had three VAC preamps over the years and enjoyed each one. If you have issues or questions call VAC as they are excellent to talk with whether you bought their products new or second hand. The phono sections are very nice. Keep on the MM setting for anything above 1mV doesn’t matter if MM or HOMC. The MC setting has 60db of gain and should work well for 0.3mV to 1mV cartridge output.
“Meter: Indicate the operating voltages within the unit. This will vary somewhat due to fluctuations in power line voltage.”
Very nice unit. I have had three VAC preamps over the years and enjoyed each one. If you have issues or questions call VAC as they are excellent to talk with whether you bought their products new or second hand. The phono sections are very nice. Keep on the MM setting for anything above 1mV doesn’t matter if MM or HOMC. The MC setting has 60db of gain and should work well for 0.3mV to 1mV cartridge output.