"Export Model" Drake L4B Modified by WF5I Dr. Thom McLees W5FV (ex WF5I) did this modification years ago. The tubes are 4CX1500Bs in grounded grid (!).
"Export Model" Drake L4B Right hand view. Notice the small variac on the back panel used to adjust filiment voltage. The amp is currently owned by W4CNN and still puts out the legal limit with lots of headroom, even with the stock Drake power supply.
"Export Model" Drake L4B Tube view. Can you guess what Doc used for chimneys and "gaskets"?
W5FV Dr. Thom McLees Would you buy an amplifier from this man?