[Repeater-Builder] Mastr@ Base 2 mtr pwr amp failure need help

[albemarle7]

Local 2 mtr repeater using MastrII Base repeater station experiencing power amp failure. Circuit board 19D424266G1 Rev3. I do not have manual. Am told its a 100 watt unit. It does not have the 4 parallel output transistors in PA section.  Symptoms are: turn up power control to 90 watts and ok until you drop input, rekey and it will not produce output power. Crank power pot back down, turn it up to 90 watts again and it will run 90 watts all day until you unkey driver again.  (using .5 watt HT for testing). Unit had the typical circuit board break on output pin to filter board. Repaired same. Unit also pulses rf power badly and can see amplitude pulse on analyzer. No spurs on sidebands. If anyone cares to comment I would appreciate it. Thanks, Gary  K2UQ   Yahoo! Groups Links To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/   To unsubscribe from this group, send an email to: [EMAIL PROTECTED]   Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.