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This 1/4” jack and control provide a signal derived from the speaker jack. Perfect for using either Recto,
(Dual or Triple Heads) as a master pre-amp, and additional power amps for more power when needed. Some players use the SLAVE
to derive an FX Send Signal and go to other amps for their wet sound.
NOTE: Once a signal is taken from the SLAVE, it can not be inserted back into the FX Loop Return jack or a
feedback loop will occur. Much like holding a microphone into the PA system’s cabinets...a loud high pitched squeal
will be the result.
Two 4 Ohm, Two 8 Ohm and one 16 Ohm jack are provided for speaker interfacing. Both the Dual and
Triple Rectifier Heads are not very sensitive to speaker mismatches and will not be damaged by them, except that very low ohmage
loads will cause the power tubes to wear faster. A single twelve-inch 8 Ohm speaker should generally be connected to the 8 Ohm
output. When using two 8 Ohm speakers, connect them both to the 4 Ohm outputs provided (because the total load is 4 Ohms in that
case.) Check out the information further back in this manual regarding speaker imped-
ance and possible speaker hook-up schemes.
4x12 cabinets may be 4, 8 or 16 Ohms. If you are not sure of the impedance of your
cabinet, you may need to remove the Rear Panel in order to verify the impedance rating
of the individual speaker or speakers. MESA/Boogie 4x12 and 4x10 cabinets come
standard wired to 8 Ohms, and are wired in series-parallel. Some Non-MESA 4x12
cabinets are wired 16 Ohms using four 16 Ohm speakers. By wiring all four speakers
in parallel, you can reduce the cabinet to an impedance load of 4 Ohms (assuming the speakers are 16 Ohms each.) No matter how
unusual your speaker setup, it is always possible to get good performance.
FX LOOP:
The Effects Loop of your Recto is probably one of the most comprehensive loops in any amplifier. It is wired in series
to the dry signal and is comprised of five elements, four on the Rear Panel and one on the Front Panel. Together they provide virtually
seamless interfacing of processors of almost any style while preserving the integrity of this high tuned
gain machine. These elements are as follows;
1.) An ASSIGN rotary control that allows you to have any combination of LOOP ON status or com-
pletely remove it from the signal path altogether.
NOTE: LOOP BYPASS defeats the Front Panel OUTPUT and SOLO Controls as they are part of
the FX RETURN circuit. This tube stage and associated circuitry are omitted when you select LOOP
BYPASS. The Channel MASTER Controls become the final output controls in this case.
2.) A SEND LEVEL Control that allows matching of levels between the output of your Recto and your processor’s input.
SEND LEVEL
BIAS
SELECT
DIODE
CH 1EL-346L6 CH 2 CH 3
TUBE TRACKING
RECTIFIER
SELECT
MAIN
POWER
PATENTED 4,211,893; 5,091,700; 5,168,438; 6,621,907; 6,724,897; 7,193,458; 7,602,927
LOOP
ON
CH 1
CH 2
CH 3
FTSW
100 WATT HEAD
DUAL RECTIFIER
BEST TO USE TUBE TRACKING WITH EL-34s
TUNER OUT
120 V~
60 Hz
4A
4 A
SLO
BLO
SPONGY BOLD
SEND LEVEL
BIAS
SELECT
DIODE
CH 1EL-346L6 CH 2 CH 3
TUBE TRACKING
RECTIFIER
SELECT
MAIN
POWER
PATENTED 4,211,893; 5,091,700; 5,168,438; 6,621,907; 6,724,897; 7,193,458; 7,602,927
LOOP
ON
CH 1
CH 2
CH 3
FTSW
100 WATT HEAD
DUAL RECTIFIER
BEST TO USE TUBE TRACKING WITH EL-34s
TUNER OUT
120 V~
60 Hz
4A
4 A
SLO
BLO
SPONGY BOLD
LEVEL
SLAVE
OUT
(TO PWR AMP)
SPEAKERS
DUAL RECTIFIER 100W HEAD
ALL TUBE AMPLIFIER HANDBUILT IN PETALUMA, CALIFORNIA
16 OHM 8 OHM 4 OHM 4 OHM 8 OHM
LEVEL
SLAVE
OUT
®
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