TRANSTUBE® 258 EFX BLOCK DIAGRAM
INPUT
LEAD
CLEAN
HIGH GAIN AMP | POST |
MODERN
VINTAGE
SWITCH
PRE
LOW MID HIGH
DIGITAL EFFECTS
POWER
AMP
CD/TAPE
8 OHM SPEAKER
FOOTSWITCH
VOLUME | HEADPHONE |
|
This block diagram shows signal flow within the unit. In order to thoroughly understand
the unit’s functions, please study the block diagram carefully.
TRANSTUBE® 258 EFX SPECIFICATIONS
POWER AMP SECTION:
Rated Power and Load:
25 W RMS into 8 Ohms
Power @ Clipping (Typically): (5% THD, 1 kHz, 120 V AC line)
25 W RMS into 8 Ohms
Total Harmonic Distortion: Less than 0.5%m 100 mW to 10 W RMS, 60 Hz to 10 kHz, 8 W (typically below 0.2%)
Power Consumption:
50 W, 50/60 Hz, 120 V AC
PREAMP SECTION:
The following specs are measured
@2 kHz with the controls preset as follows:
Channel Select Normal (Out)
Low and High @ 10
Mid @ 0
Pre Gain and Post Gain @ 10 Reverb @ 0
Nominal Levels are with Nominal Gain @ 5
Minimum Levels are with Minimum Gain @ 10
All effects “OFF”
Preamp Input (Normal
Channel):
Impedance: High Z, 1 M Ohm
Nominal Input Level:
70 mV RMS
Maximum Input Level: 0 dBV,
1 V RMS
CD/TAPE INPUT:
Input Impedance: 100 k Ohms Nominal Input Level:
.5 V RMS,
Headphone Output:
Load Impedance: 8 Ohms or greater
Nominal Power Output: 20 mW into 8 Ohms (Stereo jacks, monaural signal disconnects internal speaker when phone plug is inserted.)
System Hum and Noise @ Nominal Input Level:
(20 Hz to 20 kHz unweighted)
62 dB below rated power
Equalization:
Special low, mid, and high passive type EQ
Specifications are subject to change without notice.
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