Svetlana’s “GU78” or “4CX-5000R” tube inside. No details yet. Category: QRO/QRPJuly 8, 2010Tags: amplifierBig gunenergyham radioLinear amplifiernew equipmentPApowerQROQRO/QRPRFPost navigationPreviousPrevious post:Friedrichshafen hamradio 2010NextNext post:World Radiosport Team Championship 2010