Messenger Mobile Linear Amplifier Models & Transistors
Model	Transistors	Driver	AM	SSB PEP	Enclosure Dimensions
M90 =M1V	1@MRF455	Ø	90	110	4x3x3	Note: M1V, M2V, M3V, & early M4V lack variable input control switch to handle 10W & 20W PEP carrier radios	All later models have 4/10 variable input switch
M175 =M2V	2@MRF455	Ø	175	225	6x3x6
M250	2@MRF454	Ø	250	275	6x3x6
M300 =M3V	4@MRF455	Ø	300	350	6x3x9	M3V=variant: 4@SRF2072 w/only 2-pwr settings (not 3) & toggle switches, not rocker
M350	4@MRF454	Ø	350	375	6x3x9
M400	4@MRF454	455	400	450	8x4x11	217% larger box than M90-M350	remote cable lacks power level switch
M500	4@2SC2879	455	500	575	8x4x11	equivalent to Golden Eagle 500	remote cable lacks power level switch
M4V	8@MRF455	455	550	650	8x4x11	same transistors as M600	remote cable lacks power level switch
M600	8@MRF455	455	550	650	9x4x15	53% larger box than M400-M4V/3-power on remote	headless; no switches on amp
M800	8@MRF454	455	750	800	9x4x15	3-power on remote	headless; no switches on amp
M1200	8@2SC2879	2@455	1100	1200	9x4x15	3-power on remote	headless; no switches on amp; equivalent to Texas Star DX-1600 "Sweet 16"
M1400	16@MRF455	2@455	1300	1400	9x4x15	4-power on remote	headless; no switches on amp
M1600	16@MRF492	2@492	1500	1600	9x4x15	4-power on remote	headless; no switches on amp
M2000	16@2SC2879	2@2879	1900	2000	9x4x15	4-power on remote	headless; no switches on amp
Golden Eagle 500	4@MRF421	455	400	600	7x4x11	4-power settings	equivalent to M500