M Series Linear Amplifiers

Our M series amplifiers are the result of a three year research and development program to create a reliable source of linear power beyond the high frequency limits of our L series amplifiers.

Each Output PWB drives an individual output transformer which is located on the board to minimize wiring inductance. The small size of this transformer and second breakdown considerations of the output transistors limit the low frequency response to 10 kHz.

In order to maintain full control of the very fast output transistors used, each output transistor has its own high speed driver located very close to the transistor. The M series is available only as a voltage source.

Each amplifier board is rated at 100 VA continuously or 250 VA in tone bursts up to 1 second duration and 10% duty. As with our L series, these ratings are into any power factor load. The standard models M2, M4, and M8 contain 2, 4, and 8 Output boards respectively. The M4 is actually an M8 with 4 Output PWBs removed and may be upgraded at any time.

The high frequency response with resistive or inductive loads is about 500 kHz. With slightly capacitive loads, these amplifiers work up to 1 MHZ.

As with all our amplifiers, the load on these amplifiers may be shorted, opened, or reactive with any magnitude and phase angle with no damage occurring to the amplifier.

Specifications For Standard M Series Amplifiers

Type of amplifier	Class AB Linear Voltage source
Load power factor range	0 - 100% capacitive or inductive

Distortion (THD)	2% or less over full freq range Typically 0.25% midband

Input impedance	5 k ohm minimum
Input voltage for full output	1 V RMS nominal, 3 V RMS at highest frequency

Gate signal	TTL levels (5 V)

Selection of Output Voltage Tap	Relays operated by front panel switch or remote control

Output Voltage Taps	M2 60, 85, 120, 175
(V RMS)	M4 60, 85, 120, 175, 245, 345
	M8 60, 85, 120, 175, 245, 345, 490, 690

Frequency range (-3 dB)	10 kHz to 500 kHz

RMS noise (10-500 kHz)	-80 dB max gated ON, -120 dB max gated OFF
ref full output

Current monitor	100 mV/A
Voltage monitor	10 mV/V

Protection	No combination of loads, signals or switch settings will cause amplifier failure

Fault lights	Over-temp, over current, blown fuse

Ambient temperature	0 - 40 degrees C

Primary power	M2	120/208/240 V 50/60 Hz 1 ph
	M4 - M8	208/240 V 50/60 Hz 1 ph

Individual Specifications

Model designation	M2	M4	M8

Output VA - continuous	200	400	800
- 1 sec burst @ 10 %	500	1,000	2,000

Depth (inches)	18	24	24
Height (inches)	5.25	19.25	19.25
Weight (pounds)	50	160	170
Amplifier Photograph	M2	M4	M8
Output Amplifier Photograph	M Series Output PCB

For terms and foreign sales see PRICE POLICY in front of catalog.
Specifications and prices subject to change without notice.