Randy, There's nothing to convert; the 4EF4A3 Mastr Progress Line power amplifier is already designed to cover the 6m (50-54 MHz) band. My data identifies this unit as a continuous-duty amplifier that is rated at 150-300 watts, using a 4CX250B tube. It's a real workhorse. It will require careful tuning per the instructions found in LBI-4100, of course, but I don't think any modifications are needed. However, that statement applies only to the power amplifier; the other RF components of a 6m repeater, depending upon their model numbers, may require some modification for peak performance in the 6m band.
73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Randy Sent: Wednesday, December 26, 2007 10:51 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Repeater conversion I have access to a GE Power Amp Model# 4EF4A3 The freq is 42-54 MHz Can this repeater be converted to 6m (easily)? I also have the Duplexer.