Mesa/Boogie Heartbreaker Owner'S Manual Download Page 14

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REAR PANEL:

(Continued)

RECTIFIER SELECT: (Continued) NOTE: The stock 5AR4 Rectifier tube is best suited for most applications. If you intend to use
your

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in the 60 watt power position only, or if a 5AR4 should ever fail and you prefer the tone of the tube

rectifier to the silicone diodes - it is possible to run the

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with a 5U4G Rectifier tube. This scheme will produce

a more spongy, resilient feel. However, do not use the 100 watt power position with a 5U4G Rectifier tube in place as it will fail
and possibly cause damage to the circuit.

BIAS SELECT: The

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can use three different types of output tubes, producing drastically different per-

sonalities! The stock compliment of 4x6L6 power tubes produce the best all around combination for power, balance and versatility. A
brighter and harmonically richer Euro style voice can be found by running 4x6V6 power tubes. While all these output tubes have their
place in the history of electric guitar - and at some point we encourage you to explore your

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fully, we feel the stock

compliment of 6L6’s covers the most sonic ground with the least amount of compromise. If you
do want to try these options, these tube changes can be done in minutes without even turning
the power off, making the

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one of the best recording amps in history.

However, we suggest that you place the amp in its STANDBY position while making the swaps.

NOTE: However, it is extremely important that you pay attention to the BIAS setting
while you are swapping output tubes - making sure that the BIAS voltage remains cor-
rectly matched to the tubes in use. Failure to follow this instruction will result in dam-
age to the power tubes and possibly your amplifier!

* 6L6 and 6V6 tubes use the UPPER POSITION (6V6 use TWEED POWER)
* EL34 use the LOWER POSITION ( may use either TWEED or NORMAL, although TWEED is better suited to the available
less sturdy EL34’s of today.)

EFFECTS: SEND & RETURN These two 1/4" jacks are the patch point for external effects processors. The Effects Loop occurs
electronically between the pre-amp and the power section of the amplifier. This is one of the most crucial stages in any integr ated
amplifier and the integrity of the sound may be adversely altered here quite easily by using less than premium quality outboard gear.

Due to the extreme sensitivity of this point in the signal path in any of the high performance tube ampli-
fiers that we build, we recommend you try the amplifier with the processor you wish to interface before
you purchase it...in case the processor in question is mismatched in either impedance and/or quality.

NOTE:

The

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is a high end professional musical instrument, dedicated to deliver-

ing the purest tube tone possible. We spared no expense to assure the integrity of its all tube design and
cannot accept responsibility for the degradation of its tone due to the interfacing of outboard gear of
lesser quality.

REVERB FOOTSWITCH: This 1/4" jack allows you control of the REVERB remotely when the (optional)

Mesa/Boogie

REVERB

footswitch is connected.

BIAS SETTING MUST

MATCH TUBES IN USE!

BIAS

SELECT

6L6
6v6

EL34

FULL

NORMAL