Rumble filter (CB6541E)

This turntable filter was found on an 80's Elektor. The circuit makes use of operational features that are easily obtainable today.

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15 W amplifier – first stage (CB20580E)
This amplifier for public address was found in English documentation from 1967. The transistors are from...
ER11 High Isolation Power Transformers (COM182E)
January 2017 - Pulse Electronics ER11 transformers with high insulation can be obtained from...
35 W Amplifier (CB6299E)
With only 1% distortion, this Motorola amplifier found in a 1968 documentation makes use of period...