Technical Specifications

INPUT MAINS POWER: 115 or 230V, +/-10%, 48-62 Hz

PLATE SUPPLY: 50 to 500 VDC, in 1 V steps, 160 mA maximum

SCREEN (G2) SUPPLY: 50 TO 500 VDC, in 1 V steps, 20 mA maximum

HEATER SUPPLY: 1.0 to 12.6 V, 3.5 amps maximum

GRID (G1) SUPPLY: 0 to -99.9 VDC, in 0.1 V steps (-150V in Auto Bias mode)


RECTIFIER TEST: 5 V filament/heater (3 amps), nominal 275V RMS Plate V, 120 mA peak current

MUTUAL CONDUCTANCE TEST: 0.1 to 50.0 mA/V (100 to 50,000 uMHOs)
TUBE ELECTRODE SHORTS: Automatically checked during all tests, test stops if a short is detected
GAS TEST: Detects gas ion current effects on Grid G1 (down to .01 uA using TubeTest software)
BUILT-IN TUBE SOCKETS: 4-pin (300B), 5-pin (807), 6-pin (6E5), 7 and 9-pin miniature and Octal (3)

TUBE LIFE TEST: Using reduced heater/filament voltage (with TubeTest software)

USER INTERFACE: Four Direction and One ENTER Keys, Volume control, 4-line x 40 character backlit LCD

ENVIROMENTAL: 0 TO +40 C (operating), -20 to +70 C (storage), 95% humidity (non-condensing) max.

F/S ACCURACY: Plate, Screen, G1, Heater Voltage: +/- 1%, DC Current: +/- 1%, Transconductance: +/- 1.5%

PHYSICAL: 14.75″ W x 12.25″ D x 6.75″ H, 18.5 lbs (8.4 kg) net wt. Shipping wt. 23.5 lbs. (10.7 kg)

COMPLIANCE: Designed to comply with UL/CSA standards, tested to meet FCC and CE EMC limits

Tests hundreds of popular audio, guitar amp, organ and radio tubes
Optimized to precisely test audiophile-grade tubes
Tests tubes at real-world power levels, up to 500V @ 160mA
Direct digital readout of true Mutual Conductance using a 1 kHz AC signal
Measures Heater-to-Cathode Leakage, Emission and Gas
Emission and GM results in percent-of-spec, and actual mA, mA/V, etc.
Listen to tubes for microphonics with the built-in headphone amplifier
Tests multi-section tubes, diodes, rectifiers and electron ray indicators
Fully regulated power supplies – no mains/line compensation needed
Fully protected against overload, shorts and overheating
Routine calibration is not required
Heater/filament power from 1.0 to 12.6V, up to 3.5A
User-programmable tube test data, stored in EEPROM
Processor-controlled tube pin selection. No switches, no rewiring.
Available for worldwide operation at 115 or 230V, 50/60 Hz (nominal)
Portable, compact carrying case, 18.5 lbs (8.4 kg) net wt.
Rugged, industrial-quality construction
Connects to a Personal Computer using a standard USB port
Free TubeTest© Computer Test and Curve Plot Software included
Print test data with optional Brother P-touch Label Printer
Free Tubedata Editor software, to modify test parameters and add tubes
Software requires a PC computer running Windows XP, Win7, Win8, Win10
Designed and manufactured in the USA