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Summit Audio Model TPA-200B
Dual Tube Preamplifier
Operating Manual
IMPORTANT!: CAREFULLY READ THE ENTIRE INSTRUCTION MANUAL
BEFORE HOOKUP OR OPERATION OF THE TPA-200B.
WARNING!: HIGH VOLTAGE. THIS UNIT CONTAINS NO USER SERVICEABLE
PARTS. SERVICING SHOULD ONLY BE DONE BY QUALIFIED SERVICE
PERSONNEL OR FACTORY. DO NOT OPERATE THE TPA-200B WITH THE
COVERS REMOVED
.
Summit Audio
1183 Baltic Suite A
Gardnerville, NV 89410
Copyright 1992, 1997, 2003 Summit Audio Inc. ALL RIGHTS RESERVED. Printed in
the U.S.A.
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Summary of Contents for Summit Audio TPA-200B
- Page 1 PARTS. SERVICING SHOULD ONLY BE DONE BY QUALIFIED SERVICE PERSONNEL OR FACTORY. DO NOT OPERATE THE TPA-200B WITH THE COVERS REMOVED Summit Audio 1183 Baltic Suite A Gardnerville, NV 89410 Copyright 1992, 1997, 2003 Summit Audio Inc. ALL RIGHTS RESERVED. Printed in the U.S.A.
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Page 2: Product Introduction
-15dB and –25dB pads Hand crafted in the USA Having found this manual, carefully unpack the TPA-200B and it’s power cord. Save the carton and packing material should it be needed for future shipping. Before powering the unit, read this manual. Please observe the cautions for HIGH VOLTAGE. Proceed by doing the following: 1. - Page 3 8. PHANTOM Switches on +48V phantom power for BOTH microphone inputs for use POWER: with condenser microphones. Switches the TPA-200B on and off, indicated by the red light above the 9. POWER: phantom power switch.
- Page 4 Line/Mic Overload (OL) and Switch Overdrive (OD) Output Level Input Level LEDs +48V Phantom Power Switch Power Switch Polarity (Phase) Hi-Z Input -15/-25dB Reverse Pad Switch...
- Page 5 Getting tube guitar distortion: Plug the output of the guitar into one of the Hi-Z inputs on the front of the TPA-200B. Turn the output gain low. Turn the preamp input gain up high (start at about 7) and play the guitar. The OD light should be blinking or steady yellow.
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Page 6: Circuit Explanation
Circuit Explanation The TPA-200B is two independent tube preamps with all signal gain occurring in the tube portion of the circuit. The 990 op amp used for the low impedance output stage is made of discrete components and then potted for stability. The line and mic inputs are transformer coupled and are wired for balanced operation. -
Page 7: A Word About Tubes
A Word About Tubes The tubes that are used in the TPA-200B are selected to give the best possible performance in the position that they are in on the printed circuit board. Switching them to different positions will cause performance deterioration on the audio path. Replacing them with “gold”... - Page 8 Note: When running an unbalanced output it is best to connect pin 3 to pin 1 in the connector that plugs into the TPA-200B. Allow the TPA-200B to warm up for at least 15 minutes before using it in your processing chain. The tubes and other circuitry need time to reach an electronic equilibrium before they will operate at optimal specifications.
- Page 9 However, when used in noise, frequency response, and distortion measurements, weighting will alter the results. Completely flat frequency measurements are key to giving accurate specifications. Summit Audio devices are the highest quality professional audio gear and the specifications below are made with the flattest possible unweighted measurements, giving the most accurate results.
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