Mesa/Boogie pmn - Manual (Page 13)

SLAVE OUT:
This 1/4” jack provides a signal derived from the speaker jack. Perfect for using the RECT-O 50 as a master pre-
amp, or additional power amps may be connected for more power when needed. Some players use this 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 SLAVE SLAVE
jack or a feedback loop will occur. Much like holding a microphone into the PA system’s cabinets...a
loud high pitched squeal will occur.
SPEAKERS:
Sensitivity to speaker mismatching in regards to ohmage differences is low, hence no damage to the amplifi er will
occur. However, very low ohmage loads will cause the power tubes to wear faster. The RECT-O 50 (combo only) is equipped with
a Celestion Custom 90 single 12 inch - 8 Ohm speaker, but as you can see, other speaker
confi gurations may be used.
When using two 8 Ohm speakers, connect each of them to the 4 Ohm speaker jacks that are
provided, this will equal a 4 Ohm load which is the proper impedance required when using
this particular speaker confi guration.
BIAS SELECT:
Your RECT-O 50 amplifi er was designed with versatility in mind. So to add to the already awesome array of on
board features...we felt it essential that these new RECT-O 50 Series 2 amplifi ers be able to adapt their power output section to
use the other classic pentode power tubes, the British style EL 34. These tubes are largely responsible for
the signature sound of many immediately identifi able and wonderful sounding amps created in Great Britain
and used on some of the best recordings to date.
The nature of their sound is usually brighter in the extremely high frequencies...some players fi nd this almost
thin at fi rst. However, afi cionados of the EL34 sound know that nothing has the lushness of harmonics or
spread like a power amp using EL34’s. In truth EL34’s do focus in on a region of upper harmonics that 6L6’s
reproduce, but not really enhance, in the same way the EL34’s do.
This characteristic is sometimes preferred for sounds that range from a soft clip that would be used for
PAGE 9
REAR PANEL:
REAR VIEW - HEAD VERSION
10%
FX MIX RETURN SEND
WARNING:
Unplug power
before replacing
fuse or removing
bolts mounting
chassis.
FUSE
F US E
POWER FUSE
2.5 A
SLO
BLO 120 V~
50-60 Hz
2.5 A
POWER FUSE
FUSE
CHANNEL 1
CHANNEL 2
SET TO CHANNEL 1
TO USE FOOTSWITCH
PATENTED 4,211,000 & OTHERS PENDING FOR SOLO, MUTE & LOOP CONFIGURATION
FOOT
SWITCH
SOLO CHANNEL
EXT. SWITCHING
4 OHM 4 OHM 8 OHM
SPEAKERS
WARNING : To reduce risk of fire or
electric shock, replace fuse with
same type and rating only. Do not
expose this unit to rain or moisture.
CAUTION : To reduce risk of fire or electric
shock, do not remove cover. No user-
serviceable parts inside. Refer
servicing to qualified personnel.
FX LOOP
90%
CAUTION
SWITCH MUST MATCH
TUBES IN USE
EL34
BIAS SWITCH
6L6
ALL TUBE AMPLIFIER HANDMADE IN PETALUMA, CALIF USA
SINGLE RECTIFIER SERIES 2 SOLO HEAD
OUT
SLAVE
(TO EXT. PWR AMP)
4 OHM 4 O
SPE
ALL TUBE AMPLIFIER HANDMADE IN PETA
SINGLE RECTIFIER SERIES 2
OUT
SLAVE
(TO EXT. PWR AMP)
HEAD VERSION
4 OHM 4 OHM 8 OHM
SPEAKERS
ALL TUBE AMPLIFIER HANDMADE IN PETALUMA, CALIF USA
SINGLE RECTIFIER SERIES 2 SOLO HEAD
OUT
SLAVE
(TO EXT. PWR AMP)
CAUTION
SWITCH MUST MATCH
TUBES IN USE
EL34
BIAS SWITCH
6L6