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

Page 18

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PAGE 14

BIAS SELECT:

(Continued)

NOTE: Using the AC POWER switch set to TWEED will reduce the strain on EL34 tubes (and 6L6 as well). If you prefer the sound of
this setting, you will reduce the likelihood of tube problems and greatly extend their toneful life, as they are basically coasting.

NOTE: It is possible to run the smaller octal 6V6 power tubes for reduced power applications and a looser bubblier sound in the
TWEED AC POWER SETTING ONLY. Leave the

BIAS SELECT switch set to 6L6 (switch down) and install four 6V6 power tubes. It

is advisable to use both Channels set to the 100 watt setting for reliability and proper impedance matching.

Do not run 6V6 in the normal POWER ON setting as they cannot handle the higher AC voltage and could fail and damage internal
components! When using these tubes, move the 8 ohm speaker to the 4 ohm SPEAKER OUTPUT jack. This will reduce strain on the
tubes and produce the best sonic response.

SPEAKERS:

The

LONE STAR provides one 8 ohm and two 4 ohm speaker outputs and this enables you to use many different

combinations of speaker setups. The 1x12 combo uses an 8 ohm speaker while the 2 x 12 combo uses two 16 ohm speakers wired
in parallel and this harness connects to the 8 ohm speaker output. You should experiment with different loading conditions as there

may be a certain impedance mismatch that produces a sound you may prefer to the correct load condi-
tion. This will not hurt the ampliﬁ er, however mismatching in the higher direction will wear the power tubes
faster. You will ﬁ nd sample speaker wiring diagrams later in this manual and when you get time it would
be a good idea to browse this section to understand more about different ways you can use your

LONE

STAR with alternate speaker combinations. We build many different types of Extension Speaker Cabinets,
all with unique characteristics, as well as a line of matching Classic cabinets to enhance both the sound
and the appearance of your

LONE STAR.

SLAVE:

The

SLAVE Output and its accompanying Level control provide an output for capturing the sound of both preamp and

power section. This feature may be used to drive additional slave power ampliﬁ ers for big venue applications or to drive a string of
outboard processors when using the EFFECTS LOOP is not desirable. It is not a direct recording output as it derives its signal from
the speaker jacks and is much too strong a signal to connect to the input of a console. Also there is no roll off of high frequencies or

shaping, as the speaker does this, so the sound would be less than desirable for recording applications.
Should you need a direct recording sound, check out one of our Rectiﬁ er Recording Preamp’s which are
designed speciﬁ cally for this application and has the necessary circuitry to achieve this difﬁ cult task with
stunning results.

NOTE: The signal from the SLAVE Output is powerful. Always start with the LEVEL control set to its
lowest position (7:00) when connecting to anything and bring the level up slowly to avoid damaging gear
(and ears) downstream of the

LONE STAR

NOTE: Once a signal has been taken from the SLAVE Output, it can not be routed back into the ampliﬁ er (INPUT or EFFECTS
LOOP RETURN). Doing so will produce a feedback loop resulting in a high pitched squeal much like holding a microphone up to a
monitor.

That covers the features, outputs and functions of your

LONE STAR…now it’s up to your imagination as to how best to utilize all this

expressive power. Whichever way you take it, we wish you many years of elevated inspiration and hope you ﬁ nd lasting satisfaction
and enjoyment from this hand-crafted musical instrument.

If you have any questions or concerns unanswered in this guide, please feel free to call our Customer Service department and ask
for a Product Specialist who will be glad to help you get the answers you need. Cheers and Enjoy!

SLAVE

SPEAKERS

HAND BUILT IN PETALUMA CA.

8 OHM

4 OHM