Single ended amplifier from Western Electric tubes and components,
using 421A double triodes tube as power, 418A tetrode tube as driver
and 394A thyratron tube as rectifier.
P609 output transformers with original WE core from P&C Electronics Japan,
Thordarson input transformers, WE 274 type inductors for filter chokes.
Designed for compact size in real wood frame.
Schematic of both channels that use ExpressSCH program for drawing.
WE421A has nice smooth sound, not too sweet but compromise with many kinds of music.
Similar 5998 Tung Sol with more mellow tone.
WE418A with triode connected support WE421A to get more energy
and same bulb & base like WE437A is a valuable appearance. 😉
2 of WE394A thyratron tubes work as full-wave rectifier,
Get both benefits from thicker sound of mercury-vapor & gas filled
and beautiful blue glow of bird cage style grid.
P&C P609 output transformers is a highlight of this amplifier.
They’re deliver WE characters from using original core and improved frequency response
to cover music after WE era.
Reasonable price for people who need WE sound characters in their systems.
http://www.pandcamp.com/menu_e.html
Flat non-inductive wirewound resistor from CTS with WE patents as cathode resistor of WE421A.
WE 274 type inductor as filter chokes, not hard to find and reasonable price.
Inductance and current rating quite low because of size limit
but enough for low watt SE amplifier or preamplifier.
http://soundaries.com/2015/02/we274inductor.html/
Main power transformer from old transmitting equipment.
External filament transformer for WE394A tubes because they need more current than
main transformer winding can deliver, and inside area has no space to assembly. 😉
PIO capacitor and bleeder resistor across first electrolytic capacitor.
Rectifier area with Sprague oil filled, F&T and Hitachi HL2 capacitor.
West-Cap CPV09 paper & film in oil were selected as coupling capacitor.
Will bring Arizona capacitor “Blue Cactus” to replace this position and test again.
Wet tantalum capacitor as cathode bypass of driver tube for clearer sound.
