[PVRCNC] Rules interpretation, please

[Jim K4QPL]

Hypothetical fact situation:

 

Station has two radios, one amplifier.

Operator A uses one radio and amp for part of the contest under his call
sign. (Let's call him K3TD)

Operator B uses the other radio under his call sign when A takes a break.
(Let's call him K4QPL

 

Can Op B hook his radio to the same amp or must he be LP?

Is an amp a "radio"?

 

As you might guess, the hypothetical question has something to do with SS
SSB this weekend.

73,

Jim, K4QPL