Nady Systems GTH-100 owner manual S P E C I F I C At I O N S, Tube Replacement

	S P E C I F I C AT I O N S
Power Amp Section	Four EL34 Tubes
Power Output	100W RMS @ 4Ω — 8Ω — 16Ω 5% THD
Preamp Section	Three 12AX7A Tubes
Input Imp	HI input 200K Ω, LO input 50K Ω
Input Sens. (1KHz)	HI input max clean 800mV, Max distortion 8mV
	LO input max clean 1.6V, Max distortion 16mV
LO Input Attenuation	9dB
Lead Boost Range	12dB
Line Output Imp	600Ω
Line Output Level	1V nominal
Reverb Output Imp. ........................................................................................................................................................ 1K
Reverb Output Level	1V nominal
Power Requirements	120 VAC 60Hz, 230 VAC 50Hz
Power Fuse	5x20mm glass tube, slow-blow
	4A/250V for 115VAC, 2A/250V for 230VAC
High Voltage Fuse	1A 250V fast blow
Dimension	28” x 10.75” x 9” (71 x 27 x 23cm)
Weight	45 lbs (20kg)

TUBE REPLACEMENT

Preamp Tubes 12AX7A — No adjustment required

Output Tubes EL34 — After replacing output tubes, output tubes bias voltage should be checked with Standby switch set to On, no signal input, and all controls set to minimum. If output tube bias voltage is not correct, amplifier will sound unusually distorted with mushy audio and output tubes may overheat. Normal output tube bias voltage should be -46VDC on Pin 5 of all output tubes. For best results use matched output tubes.

Caution: Do to dangerously high voltage, these adjustments should only be made by qualified technician.

The specifications above are correct at the time of printing of this manual. For improvement purposes, all specifications for this unit, including design

and appearance, are subject to change without prior notice.

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