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2. Charge controller - Wikipedia

   en.wikipedia.org/wiki/Charge_controller

   It may also prevent completely draining ("deep discharging") a battery, or perform controlled discharges, depending on the battery technology, to protect battery life. [3] [4] The terms "charge controller" or "charge regulator" may refer to either a stand-alone device, or to control circuitry integrated within a battery pack, battery-powered ...

3. Randall Amplifiers - Wikipedia

   en.wikipedia.org/wiki/Randall_Amplifiers

   In the early 2000s, the company worked with Bruce Egnater of Egnater Amplification to create the MTS (Modular Tube System) series of guitar amplifiers. These involve a single amp head consisting of the power amp and part of a preamp, and slots in the head (one for the RM20 head and combo, two for the RM50 head and combo and RM22 head, and 3 for the RM100 head and RM100C combo, and 12 for the ...

4. Egnater - Wikipedia

   en.wikipedia.org/wiki/Egnater

   Egnater produces a series of modular amplifiers (the MOD50/MOD100 and preamplifier M4) which employ a modular architecture, with 2 to 4 vacuum tubes in a footswitchable configuration. Egnater collaborated with Randall Amplifiers for the Randall MTS series of guitar amplifiers and preamplifiers, which follow the same modular design but use less ...

5. Battery charger - Wikipedia

   en.wikipedia.org/wiki/Battery_charger

   A battery charger, recharger, or simply charger, [1] [2] is a device that stores energy in an electric battery by running current through it. The charging protocol—how much voltage and current, for how long and what to do when charging is complete—depends on the size and type of the battery being charged.

6. Williamson amplifier - Wikipedia

   en.wikipedia.org/wiki/Williamson_amplifier

   Tube complement, 1947 version: 4x L63 (each equivalent to 6J5), 2x KT66, 1x U52 directly-heated rectifier. [56] The 1949 version also provided for the use of 6SN7 or B65 double triodes, and replaced rectifier with the 53KU indirectly-heated type; [57] Output power and maximum distortion: 15 W RMS at no more than 0.1% THD; [58]

7. Output transformerless - Wikipedia

   en.wikipedia.org/wiki/Output_transformerless

   Output transformerless (OTL) is a type of vacuum tube audio power amplifier, which omits an output transformer for the purpose of greater linearity and fidelity. Conventional vacuum tube amplifier designs rely upon an output transformer to couple the amplifier's output stage to the loudspeaker.