Leeds & Northrup R-820-1-1 Amplifier (R-820-1) is identified by Production Number 800624 and specifies operation from a 120V power supply at 50/60 Hz. This exact variant is the R-820-1-1, confirming the model designation and tying the unit to Prod. No. 800624, the precise part referenced by the product title. The power specification of 120V with 50 Hz or 60 Hz input clarifies the intended electrical compatibility for use with standard mains.
