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THD Flexi

The precision, hand-built, single-channel THD Flexi-50 50W/20W Class AB Amplifier Head can operate loaded with almost any preamp and power tubes in any combination. It’s the only amplifier you need to own. Whether you strive for English overdrive, California clean, or Texas punch, this master-class head can deliver it. It also boasts a heady 50W Class-AB operation, footswitchable overdrive/boost, and footswitchable master volume control. Its consistently overbuilt and pristine circuitry ensures dramatic touch sensitivity even at the highest overdrive settings. Its incredible flexibility (the reason it’s named Flexi-50) delivers all the sounds and tones you could possibly desire, from vintage purr to modern, high-gain roar.

Make and model THD - Flexi 50
Power (Watt) 50 W
Type Head
Channels 1
Lamps
Power lamps 2 x EL34
Preamp lamps 3 x 12AX7
Rectifier Solid
Effect loop Yes
Effects Yes
Reverb No
Impedance 4/8/16
Size
Weight 20.4
Other Footswitchable overdrive/boost and master volume control

THD-Flexi

THD is thrilled to announce the arrival of their new Flexi-50 amplifier head. The Flexi-50 is a precision hand-built 50-watt Class-AB amplifier with foot-switchable overdrive/boost, foot-switchable master volume control and the ability to use almost any preamp and power tubes in any combination, including 6L6, EL34, 6V6, 6CA7, 8417, 6550, KT66, KT77, KT88, KT90, KT100, EL84 (with Yellow Jacket adaptor), 6K6, 6F6, 12AX7, 12AY7, 12AU7, 12AT7, 12AZ7, 12DW7, 12BH7, ECC83, ECC82, ECC81 and many more, giving the user a huge palette of available sounds simply by changing tubes.

The amplifier has a fat, clear, full clean sound reminiscent of late 1950s to early 1960s American combos, and overdrive to rival the best British heads. Even at the highest overdrive settings, the amp still demonstrates dramatic touch sensitivity, cleaning up very well when the volume on the guitar is reduced. Additional features include external bias test points and individual bias controls, permitting the user to quickly and accurately set the output tube bias with any digital voltmeter. The dual bias controls permit the user to correctly bias even mismatched tubes, eliminating the need for matched power tubes.


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