Audion Tube Amplifiers, Pre-Ampliers and Electronics

 

Thorsten-Loesch on how to convert the Edison 60 to a 300B amplifier

This 300B Parallel Single Ended (PSE) Amplifier is based upon the Edison 60 Amplifier Kit which is made by Audion. This modified Version uses the PCB's from the Edison Kit with only minor changes. The biggest changes are in the PSU. The driver stage is similar to that of the Audio-Note P4 and the Audion Silver Night. The input valves found to sound best were old production Tesla E88CC (goldpin) (supplied by us) and General Electric 6CG7 (think of it as a 6SN7 in a 9-pin bottle). In general there is nothing unusual about this circuit


This 300B Parallel Single Ended (PSE) Amplifier is based upon our Edison 60 Amplifier Kit. This modified Version uses the PCB's from the Edison Kit with only minor changes. The biggest changes are in the PSU. The driver stage is similar to that of the Silver Night. The circuit below shows the design changes
 edison 300bamp

edison 300bpsu

The rectification is solid state with extensive filtering.Edison 60 rear

A pair of Svetlana SV300B valves per channel produce about 18 watts per channel. Heaters are all AC, the noise on the Output is around 2mV. The sound of the Edison Amplifier with 300B Output Valves in PSE zero feedback operation is more alive, more vibrant and dynamic than when using the EL34. The high range is sweeter and all in the Amplifier is consderably improved. Highly recommended.

At Audion, we can supply most of the extra components listed here including the 10 henry choke, valve bases and most of the passive components but not necessarily those listed above. Our mains transformer is new and much higher rated than previously and will not generate as much heat as the previous one did.

The above circuit can also be modified for use with the 2A3 tube very easily - we can supply components and details if you require.

 

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