Summit Audio TPA-200B Dual Tube Mic/Line Preamp - Manual (Page 9)

Note on specifications: Summit Audio is uncompromisingly committed to excellence. All
of our specifications are made with the latest technology and are UNWEIGHTED
measurements. What does this mean? When measurements are “weighted” (e.g. “A”
weighted, dB (B), dB C weighted, etc.), the measurement devices are basically EQed or
filtered before the measurement is taken. This filtering was developed so that sound
pressure level (SPL) measurements can more nearly match human’s non-linear hearing
characteristics. 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.
Specifications:
• Output: +4dBM corresponds to 0 VU. The output is balanced or unbalanced using
990 operational amplifiers. Output impedance is 75 Ω. The recommended output load
is 600 Ω or more. Maximum output approaches +25 dBM.
• Input: The input is transformer balanced. The mic input impedance is 1500 Ω, the line
level input impedance is 40K Ω and the Hi-Z input impedance is 1MΩ. The mic and
line inputs are balanced and the Hi-Z input is unbalanced.
• Overload (red LED) lights when the input stage is driven to 5dBM below clipping.
• Overdrive (amber LED) lights when the second stage is driven to 5dBM below
clipping.
• Components include 3 selected 12AX7A vacuum tubes, 4 high reliability 990
operational amplifiers, 12 integrated circuits and 9 transistors
• Panel Size: Standard 19” by 3.5” (2 units of rack space)
• Depth: 10.5”
• Power: 35 watts, 115 or 230 volts, 50 or 60 Hz
• Fuse Size: 0.5 Amp for 115 VAC, 0.25 Amp for 230 VAC
• Shipping Weight: 16 lbs.
To operate this unit on 115 volts, unplug the unit, switch the line voltage selector on the
back of the unit to read 115 volts and confirm that the external fuse (mounted in chassis)
is a [3 AG ½ Amp slow blow]. To operate this unit on 230 volts, switch the line voltage
selector on the back of the unit to read 230 volts and confirm that the external fuse
(mounted in chassis) is a [3 AG ¼ Amp slow blow].