DIY Pentode single stereo amplifier was withdrawn from storage room after 20 years from production by myself. As a matter for great surprise, the sound from JBL LE8T is so clear, pure, powerful and so fresh, just pleasantly grainy well on every musical instruments compared with some Triodes like 2A3 and 245 & 45. direct heater system designed. Generally speaking, secondary distortion has much advantage than third one, because odd waveform should stimulate a human auditory nerve too much uncomfortably, this why the direct heating Triodes are preferred those have much secondary harmonic distortion wave. This theory prevails if ordinary 6V6GT tubes are invited on my DIY amplifier, but once the power tubes are replaced into Western Electric JAN-CW-349A this principle is easily turned over. It is somehow eccentric way of Tube low wave amplifier to put it on the final power tube, this designing is BINGO! , Russian 6SN7 is invited as the SRPP drivers. Of course, delay switch on timer is designed for gradual high voltage acceptance after the heater is warm-upped.
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