Shure M66 Schematic

Physical Size:

Output Level: Approximately	-67dbm	using	Shure M3D	or
M7D Stereo Dynetic Cartridge from the		RCA Test Record		No.
12-5-71A. (Output measured with	250 ohm output		impedance.)

Insertion LOSS: 28db measured with conditions as outlined in "output level." The insertion loss may vary with different output load impedances.

Hum Shielding: The M66 Equalizer is enclosed in an especially designed steel case for maximum shielding.

The Equalizer case is 3%" wide, 3" high, and 5%" deep. The panel plate is 5" wide and 35/16" high.

INSTALLATION: The Model M66 Broadcast Stereo Equalizer is designed t o be mounted on a control panel with the switch shafts coming through the an el or t o be mounted on a bracket, (supplied), for permanent installation where the switch shafts need not be accessible.

The following steps are recommended for mounting t o a control panel.

I.Using the panel plate of the Equalizer as a template, locate and mark the 2 mounting screw clearance holes and the 2 switch shaft clearance holes.

2. Drill 3/16 diameter holes t o clear the	mounting screws and
25/64 diameter holes t o clear switch	shafts.

3.Mount equalizer case and panel plate t o the panel using the

#8-32 machine screws. In this case, use the angle bracket

as a spacer between the equalizer case and the panel. This allows clearance for the switch mounting nuts.

4. C u t switch shafts to proper length and install switch knobs.

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FREQUENCY IN CYCLES PER SECOND

COMPENSATED FREQUENCYRESPONSE

FIG. B

CONNECTIONS: The Model M66 Equalizer is designed for use with a balanced line output or with an unbalanced line output.

For a balanced line output connection, the "high"							side		o f the
line should be connected t o the terminal marked + and the									"low"
side of the line should be connected			t o the adiacent "out"					terminal
(not coded). The shield or		ground		should	be connected				t o the
terminal marked GND.
For an unbalanced line,output connection, the "high" side of
the line should be connectdd		t o the	OUT terminal			marked		+ and
the ground side o f	the line	should	be connected			t o both		the ad-
jacent OUT terminal and the G N D terminal.					If a separate shield is
used, this may, also, be connected t o the G N D terminal.
The two channel input (terminals				marked I N )		has	a	common
ground, as indicated on the		terminal		board.
In the " M O N O "	switch	position, the two channel inputs are
shorted together for	monaural operation.

GUARANTEE: This Shure Broadcast Stereo Equalizer is guar-

teed to be free from electrical and mechanical defects for a period

of one year from date of shipment from the factory, provided all

instructions	are	complied	with fully.	In case o f damage,	it is	es-
sential that	you	carefully	repack the	unit and return it t o	the	fac-
tory for repair.		Our guarantee is voided if the basic assembly has
been subiected		t o unreasonably rough handling.

FREQUENCY IN CYCLES PER SECOND

FREQUENCY RESPONSE

FIG. C