Mesa/Boogie Formula Pre Owner's Manual page 17

REAR PANEL:
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TUBE BAY: Do not force the tube - if it won't go in pretty smoothly - you probably have the tube mis-
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aligned or possibly one or more of the pins have bent. Forcing the tube could result in damage to the socket. Always inspect
the pins on a tube before attempting to insert them into the socket.
NOTE: See the TUBE TASK CHART on the following page for the individual roles each tube plays in the Formula's circuit. Usually
it is one tube that is responsible for a malfunction and it is not recommended that you replace all five tubes. Pre-amp tubes - unlike
power tubes - can work great for many years and they have been screened and tested for performance and tone before being
installed in your unit at the factory. You can feel free to experiment with other pre-amp tubes but if you do, please...do your self a favor
- note which tube was in which tube socket before you take a tube out! By keeping track of this tube placement you will be assured of
being able to go back and reference the unit as it was before you changed it...most helpful, we assure you.
NOTE: While any 12AX7A will work in your Formula Pre-amp, the Formula's 6 month Warranty is valid only with original or
replacement Mesa tubes in place.
Now that we have reviewed all the features and controls, you are ready for the fun part...exploring the myriad of amazing sounds the
Formula is capable of producing. It is our guess that it will exceed your expectations and become an invaluable instrument of
expression, adding joy and inspiration to your music. If there are any questions you have unanswered after reading through this
manual, feel free to call our Customer Service Department and speak to one of our Product Specialists and they will be delighted to
help you with your needs.
We wish you many years of enjoyment with the Formula and hope it adds to your musical fulfillment in both live and recording
situations. Cheers...! And once again, Thanks for trusting us to build your amplifier. From all of us at Mesa/Boogie, Enjoy!
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