[Amps] FW: 4Z4RB amplifiers

[Bill Turner]

ORIGINAL MESSAGE:          (may be snipped)

On 7/2/2014 10:32 AM, Matt wrote:
> orgive my ignorance, but just comparing the input volts/amps to the output
> would seem to indicate an efficiency of ~75%, which would indicate class C
> operation.  How could these be suitable for anything other than CW?  Am I
> missing something here?
>
> Matt
> KM5VI

REPLY:

Good question, thus the need for data sheets.

There does appear to be two small pots (rectangular blue objects with a 
screw adjustment) which are most likely bias adjustment pots.  If so, 
they should be able to be set for class AB operation. No doubt the 
efficiency figure is for class C, as you suspected.

73, Bill W6WRT
dezrat at outlook.com