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  2. Fender Harvard - Wikipedia

    en.wikipedia.org/wiki/Fender_Harvard

    The amplifier had a very simple circuit and used only a single channel with a two-stage preamp, with just a volume and (treble-cut) tone control. The Harvard was a fixed bias amplifier, using a basic cathodyne phase inverter, but did include a selenium rectifier in the bias circuit. The 5F10 was discontinued in 1961.

  3. KT88 - Wikipedia

    en.wikipedia.org/wiki/KT88

    It is one of the largest tubes in its class and can handle significantly higher plate voltages than similar tubes, up to 800 volts. A KT88 push-pull pair in class AB1 fixed bias is capable of 100 watts of output with 2.5% total harmonic distortion or up to about 50W at low distortion in hi-fi applications.

  4. Valve RF amplifier - Wikipedia

    en.wikipedia.org/wiki/Valve_RF_amplifier

    A valve RF amplifier (UK and Aus.) or tube amplifier is a device for electrically amplifying the power of an electrical radio frequency signal. Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers during the 1960s and 1970s, initially for receivers and low power stages of ...

  5. Biasing - Wikipedia

    en.wikipedia.org/wiki/Biasing

    Class B vacuum tube amplifiers are usually operated with grid current (class B 2). The bias voltage source must have low resistance and be able to supply the grid current. [3] When tubes designed for class B are employed, the bias can be as little as zero. Class C amplifiers are biased negatively at a point well beyond plate current cutoff ...

  6. Fender Hot Rod Deluxe - Wikipedia

    en.wikipedia.org/wiki/Fender_Hot_Rod_Deluxe

    The Hot Rod Deluxe is an all tube combo amp rated at 40 watts. It utilizes a single 12-inch Celestion A-Type Speaker. It utilizes a single 12-inch Celestion A-Type Speaker. The Hot Rod Deluxe is a mono-channel amplifier featuring 3 switchable gain levels: "Clean", "Drive", and "More Drive" selectable on either the control panel or footswitch ...

  7. 6V6 - Wikipedia

    en.wikipedia.org/wiki/6V6

    The pentode EL84/6BQ5 - 9 pin Noval base tube, that although different enough from the 6V6 not to justify rating it as an equivalent, because of its popularity and ready availability, plus having a close-enough similarity to make it possible, if bias is altered, adapters have been developed commercially to allow an amplifier designed for 6V6 ...

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    mail.aol.com

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  9. Fender amplifier - Wikipedia

    en.wikipedia.org/wiki/Fender_amplifier

    The tube amps in the series feature hand-wired eyelet board construction and are also becoming sought-after collectors items, due to the design and build quality. The range included one small tube-driven bass amp, the Bassman 20. There were also some solid-state amplifiers using the II moniker, such as the Harvard Reverb II. Other solid-state ...