Buzz Audio ma-2.2stereo microphone preamp - Manual (Page 7)

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4] Options.
• Output Transformer.
Mounting holes on MA 2.2 bottom panel behind the main channel
circuit board are provided for fitting a Sowter type 8403-A line
output transformer. Sowter transformers are made in England and
can be purchased on line at http://homepages.tcp.co.uk/~sowter/
Buzz Audio can also supply the transformers pre-fitted to the MA 2.2
or as a kit for retro fitting. Soldering is required to fit the output
transformer. For further information contact your dealer or Buzz
Audio.
• Special Versions of the MA 2.2.
Some of the special options Buzz Audio can supply include;
•
High gain versions.
• Different input impedances, eg 600 ohm.
• Electronically balanced output module using hi-quality operational
amplifiers instead of the transformer.
Contact your dealer or Buzz Audio for more information and pricing.
5] Tips.
•
Ensure the MA 2.2 has adequate ventilation. The Class A circuitry
does generate a fair amount of heat and the box will get warm.
Avoid racking next to high heat generating devices.
• Avoid racking the MA 2.2 next to possible induced noise sources
such as power amplifiers or anything with a big power
transformer and equipment that uses large switching power
supplies like computers or VDU’s.
• Remember the standard output is unbalanced, if you seem to be
getting no signal it may be that the MA 2.2 output is being
shorted by a reversed phase (pin 3 HOT) unbalanced input.
•
Avoid connecting/disconnecting microphones with the GAIN on a
high setting and/or with the 48V phantom switched on. Switch
the PAD to –20dB and MUTE the output. This will avoid huge
transients entering the amplifier front end.
•
Clean the MA 2.2 with a damp cloth and a little detergent. Do not
use solvents or isopropyl alcohol, it may damage the finish.
MA 2.2 USERS MANUAL VERSION-1 PAGE 6