![]() The kit’s circuitry includes RC power supply filtration for the input stage as well as a capacitor stage for the output tube. The Russian 6J49P is supplied with the kit, but other tubes in this “family” can be used, as well, with only minor modifications required, if any. ![]() These tubes have the advantage of very high gain (>50) and moderately low plate resistance, making them really useful for this type of input stage. ![]() The tube type used in this input stage is a class of high transconductance pentodes that are connected for operation as Class A triodes. It’s possible to outfit the kit with a grid choke on the input tube, as an option, as well. One uses a Lundahl interstage transformer while the other uses the more common capacitor coupling method. There are two coupling options built into this kit. We have developed a single-ended (SE) input stage with relatively high gain, making it possible to build a two stage amplifier with adequate input sensitivity to work in a wide range of audio systems, not just systems that use high sensitivity speakers. Single-Ended Amplifier Input Stage Kit (shown configured for capacitor coupling with input grid choke) ![]()
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