Fuse; Rectifier Select: Diodes & Tube Rectifier Tracking - Mesa/Boogie LoneStar Amplifier Owner's Manual

REAR PANEL:
WARNING:
Unplug power
before replacing
fuse or removing
bolts mounting

FUSE

SILICON FAN
chassis
First set sound with
DIODES ON
LOOP bypassed. Then
FUSE
set SEND & OUTPUT
to 50% for unity gain.
With LOOP IN, adjust
SEND to match FX.
POWER FUSE WER FUSE TUBE FAN
Use OUTPUT for
RECTIFIER OFF
RETURN level and
120 V~ 4 A
TRACKING
live volume control.
60 Hz SLO
4 A BLO
FUSE:
This is the A.C.'s (Alternating Current) main fuse and provides protection from outside A .C. fluctuations as well as power
tube failure damage. Should the FUSE blow, replace it with the same rating in a Slo-Blo type package. The domestic U.S. version
requires a 4 amp Slo-Blo FUSE. A power tube short or failure is often the cause of a blown FUSE...Follow the cold start procedure
mentioned in the ON/STANDBY switch section and watch the power tubes as you flip the STANDBY to the ON position. If a power
tube is going bad or is arcing you will see it! Flip the STANDBY switch to Standby immediately and replace the faulty power tube and
the FUSE if necessary.
WARNING:
Unplug power
before replacing
fuse or removing
bolts mounting
DIODES
chassis
FUSE
If you see nothing abnormal as you switch the STANDBY on, it is possible that a power tube shorted tempo-
FUSE
rarily and blew the FUSE. If this is the case it may work again normally. To be safe, you might want to replace
POWER FUSE POWER FUSE
just the adjacent tube or all power tubes in the "shotgun" troubleshooting tradition and save the replaced set
120 V~ 4 A TUBE
RECTIFIER
60 Hz SLO
TRACKING
as spares. Spare fuses are a must for the fabled cord bag along with your spare tubes. Always carry both for
4 A BLO
they could be worth their weight in gold someday.
RECTIFIER SELECT: Diodes / Tube Rectifier Tracking
Tube, to convert the voltage from AC to DC for the power supply. The LONE STAR incorporates a further improved version of our
patented Switchable Rectifier feature first seen on the Dual and Triple Rectifier SOLO heads. It incorporates a Rectifier Tracking™
feature that insures proper voltage is present at all times and improves reliability. This switch operates in tandem with the individual
Channel Power Select (50/100) switch located on the right side of the Front Panel.
WARNING:
Unplug power
before replacing
fuse or removing
bolts mounting
The Rectifier Tracking feature monitors the Channels, determines their power status and automatically selects
chassis
DIODES
FUSE
FUSE
the proper rectifier type - which ultimately assures the best sound. This provides optimization of the power
POWER FUSE POWER FUSE
settings, delivering a magical tube-rectified power-sag vibe for the channel set to 50 watts - and a tighter,
120 V~ 4 A TUBE
RECTIFIER
60 Hz SLO
bolder 100 watts of diode-rectified authority for the channel set to full power.
TRACKING
4 A BLO
Selecting DIODES chooses the solid state diode rectifiers which deliver maximum power and headroom, while tracking tighter and
imparting a quicker transient response and bolder attack. When set to DIODES, both Channels will respond with this character
regardless of their individual power settings on the Front Panel. Selecting TUBE RECTIFIER TRACKING engages the 5U4 rectifier
tube automatically (either or both channels) whenever the 50 watt selection is made on the Front Panel Channel Power Select switch.
When switching to the opposite channel, if the Channel Power Select is set to 100 watts, the Diodes are automatically engaged to
insure proper matching to the added load on the supply.
This innovative feature allows you to tune each channel for the ultimate power expression and feel. With this flexibility you can switch
between a high power, spanking clean rhythm sound in Channel 1- and a saggy brown, old school power clip for bluesy single note
solo work with the DRIVE bypassed in Channel 2. Or conversely, set Channel 1 for a sweet low power clean sound and crank up the
horsepower with the DRIVE active to articulate a high gain solo voice in Channel 2. Regardless of the way you choose to dedicate
your Channels, you will find this power section flexibility a remarkable step forward toward your ultimate tone.
NOTE: Don't forget the Front Panel AC switch incorporates the reduced voltage TWEED setting. This adds yet another dimension to
the power expression scenario and can produce amazing results when combined with the TUBE RECTIFIERTRACKING feature. Be
sure to experiment with these two features in combination with each other.
LONE STAR
RETURN
SEND
NORMAL
MIN
HARD BYPASS
SEND LEVEL
TUBE LOCATIONS
1 x 5U4 1 x 5U4 4 x 6L6 4 x 6L6
Dual and Triple Rectifier SOLO heads. It incorporates a Rectifier Tracking™
Dual and Triple Rectifier SOLO
M B
ALL - TUBE
ESA OOGIE
AMPLIFIER
CH 2 REVERB CH 1
REVERB
LOOP
BRIGHT
IN
REV WARM
This two position toggle selects the type of rectifier, Silicon Diodes or
PAGE 11
CHANNEL SOLO BIAS SELECT
EL-34 EL-34
EXT
SW
WHEN
6L6
RED ON
CAUTION: SWITCH MUST
MATCH TUBES IN USE
SPEAKERS
SLAVE
8 OHM 4 OHM 4 OHM
HAND BUILT IN PETALUMA CA.