Rear panel, Continued) – Mesa/Boogie LoneStar Amplifier User Manual

Page 17

PAGE 13

REAR PANEL:

(Continued)

REVERB:

The

LONE STAR incorporates a stunning analog Reverb circuit that is ﬁ tted with individual Channel Mix controls and a

unique Reverb Voicing feature that offers a choice between two classic reverb sounds.

REVERB BRIGHT produces a vintage guitar amp style brighter sound ﬁ lled with canyons of
harmonics and the classic spring resonance, while

REV WARM features a smoother, warmer

character often associated with large plate studio reverbs. You will quickly see why we think
the

LONE STAR Reverb is possibly our best reverb to date. Enjoy!

CHANNEL & SOLO: External Switch Ports:

These two 1/4” jacks provide an interface for remote control of the Channel Select

function as well as activation of the SOLO control. These jacks may be connected to an external control unit that stores a grounding

logic switch function under a midi program number, thereby removing the need to use the included
LONE STAR Footswitch in larger stage rigs.

The

EXTERNAL SWITCH jacks respond to any tip-to-ground latching type logic for their triggering. This

type of switching logic can be found on most midi master control switching units on the market.

BIAS SELECT:

This mini toggle allows for proper biasing when swapping to EL34 type power tubes for a brighter harmonic laden

response. It selects a different set of bias resistors and insures that these extremely different power tubes will sound better and work
much more reliably. The adjacent LED indicator alerts you that the bias has been set to accommodate the EL34’s.

NOTE: It is extremely important that the BIAS SWITCH setting match the type of
tubes in use. Failure to comply will result in damage to your ampliﬁ er. Always check
the

BIAS SWITCH whenever swapping tubes!

If you are doing mostly cleaner rhythm style playing and go for a warmer fatter
lead solo voice as well as need a variety of sounds, you will likely prefer the stock
compliment of 6L6’s. They clip in a warmer way and during our R & D process we
found them to produce the best blend of frequencies with the least compromise
stylistically.

There are however, some wonderful clipped power sounds available for both chording and single note work with the right set of EL34’s
ﬁ tted. Aﬁ cionados of this sound have long recognized that nothing produces the layers of soft, lined-up harmonics like these British
style bottles and when dialed right, the

LONE STAR takes on a whole new personality. So when you have ﬁ nished exploring this side

of the Atlantic for vintage magic, deﬁ nitely take a jump across the pond and check out some of the amazing sounds that are made
possible with the inclusion of the

BIAS SELECT feature and these opposite sounding tube types.

We recommend the 6L6 for reliability: In our many tests and continued use of the currently available EL34 type power tubes on the
market today, we regret to say that they do not appear to be as rugged in construction or as reliable as their 6L6 counterparts. This
fact, along with their sonic narrowing of possible styles, is why the

LONE STAR ships with 6L6 power tubes.

If you ﬁ nd that your signature sound relies on using EL34 power tubes, then we strongly suggest keeping at least one spare set of
tubes and a bag of extra fuses with you at all times when performing in the event of a tube failure. A little preparation will save you a
lot of frustration should one of these less rugged tubes fail.

LOOP

HARD BYPASS

OOGIE

ESA

LONE STAR

CH 2 REVERB CH 1

REVERB

BRIGHT

REV WARM

ALL - TUBE
AMPLIFIER

REVERB

BRIGHT

REV WARM

ALL - TUBE
AMPLIFIER

CHANNEL

SOLO

EXT
SW

SLAVE

SPEAKERS

HAND BUILT IN PETALUMA CA.

8 OHM

4 OHM

BIAS SELECT

EL-34

WHEN

RED ON

EL-34

6L6

CAUTION: SWITCH MUST

MATCH TUBES IN USE