Monday, April 29, 2024
Eureka!, Just 3 transistors from MM record player cartridge to Loudspeaker, everything in single ended class A operation, (electrons flowing all the time)
At your risk.
It is so simple with minimum components and it sound amazing, huge bass, great mid smoothness and anazing treble. On a good record (see below) cymbals sound so good one can almost visualise the sound as what is seen when a small objest falls on a calm sea. This is how the attack sutain and decay of the cymbal feels like. And when the program material becomes busy as on the end guitar solo of To France - Mike Oldfield nothing sounds tiring to the ear, the sound is still big and clean. All this with so small power consumption. The RIAA preamplifier comsumes less than a millamper at 8 volts, and the power amplifier about 10-14 milliamperes at 24 Volts. Yet the sound level is ordinary comfortable without being loud of course.
The transistors used are 2 K117 JFETs per channel for the RIAA preamplifier and one 2N3053 bipolar transistor per channel for the power amplifier.
Signal path:
Just the Way you Are - Billy Joel from a foreign pressing LP - Technics SL1200 MKII turntable - Stanton 680 or 681 cartridge - EEE AR stylus - Pleiades 2 K117 RIAA preamplifier with a 9 volt battery - Pleiades 2N3053 power amplifier powered by 24 volts (2x12V batteries in series with fuse), (Pleiades output transformers, see older post) - Celestion Ditton 150 speakers - small reverberent room - listener
So far the other song played is To France - Mike Oldfield from a Hellenic pressing LP at the no longer existing Columbia factory in Athens.
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