Instruction/ maintenance manual of the product 400 Mesa/Boogie
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Strategy 400 Stereo Operating Manual 1.
CONGRATULATIONS AND THANK YOU! You've just become the proud owner of the world's most musical power amplifier: The Strategy 400™ Stereo. All of our efforts have been directed at making this a special piece of equipment -- a fine hand-made musical instrument -- that we hope you'll enjoy and treasure for many years to come.
INPUT CIRCUITRY The Strategy 400 Stereo offers extremely sensitive input circuitry: 0.2 volts will produce full power when the Level control is turned fully up. This means you can actually plug in many signal sources directly without needing a preamplifier.
POWER TUBES The main power tube used in the Strategy 400 Stereo is the MESA STR 415 type 6L6 GC which provides smooth, warm musical power and is very reliable.
DRIVER TUBES The four small tubes are all type 12AX7, also known as 7025, ECC83 or MESA SPAX7. These tubes are very long lasting and trouble free in the Strategy, but best performance will result from using genuine replacements.
tend to cancel themselves out and disappear (the original signal is also reduced so extra "gain" is designed in to more or less compensate). How much NFB is the "right amount"? It depends on the the amplifier. A "perfect" amplifier would have no need for negative feedback.
swinging is confined to the region between the floor and ceiling -- isn't hitting either one -- the lever (amplifier) is operating in its "linear region".
The ear has a great tolerance for these overtones - because they relate in a musically consonant way and are are already present in the original signal, as either timbre overtones, upper harmony or both. For example, it is often possible to add up to 20% second harmonic to a single note before any change is audible.
An important point after buying a device Mesa/Boogie 400 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Mesa/Boogie 400 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Mesa/Boogie 400 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Mesa/Boogie 400 you will learn all the available features of the product, as well as information on its operation. The information that you get Mesa/Boogie 400 will certainly help you make a decision on the purchase.
If you already are a holder of Mesa/Boogie 400, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Mesa/Boogie 400.
However, one of the most important roles played by the user manual is to help in solving problems with Mesa/Boogie 400. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Mesa/Boogie 400 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
