This amplifier is designed with as goal little, but clean power! It is in principle able to put out about 16 watts, but an extra buffer stage has to be added in that case. Because I need only few watts to let the speakers blow my ears off I settled for 4 watts. These four watts are played with very minimal distortion and no feedback. The signal in this amp flows only through one resistor, one capacitor, two triode tubes and the outputtransformer.

Because at the moment of building Svetlana had published offscale datasheets, the outputpower turned out to be only 1 watt, a bit low, but more than enough for my front loaded Lowther speakers. When I get a bigger room, some small changes will give them more power if needed. The datasheets now published seem to be right.

All wires internal are silver (including the powersupply), resistors Allan-Bradley and Mills, capacitor in the signal is silver-mica, there are no solidstate and electrolytics in the complete amp except for the heather supplies. Negative bias voltage supply, pre-stage supply and powersupply are all seperate and tube rectified.

This amp really is sounding great! Works perfect, also does react smoothly on extreme situations as pulling out plugs, etc. The sound is very crisp, much feeling, very fast, just what I was looking for in my long trip through audio equipment!

Great thanks go out to Hans van de Weyer, for his perfect teaching capabilities and help during building.

The schematics are presented here.

Technical data:

Supplies          : 600 V/200 mA, 400 V/40 mA, -85 V/10 mA (tube stabilised).
Tubes             : CV1932 (6J5) Valve Electronic, SV811-10, 5R4WGTB Chatham, 5Y4GT RCA, 
                    85A2 Mullard, 5W4GT National Union.

Outputtransformer : Sowther custom made.
Measurements      : Monoblocks 335 x 455 x 230 mm, power supply 440 x 220 x 30, heather supply 200 x 250 x 100.
Weight            : About 30 kg each side, power supply about 30 kilos, heather supply about 10 kilos.