THEORETICAL CIRCUIT DIAGRAM. (1) Aerial series condenser, midget variable or fixed .0001. (2) Aerial inductance, 20's enamel spaced with 24's, tapped at 18th from earth end. (3) Aerial tuning condenser, .0005 mfd. (4) Neutralising condenser, (5) R.F. valve, medium impedance. (6) R.F. rheostat, 30 ohms. (7) Primary of R.F. transformer, 14 to 20 turns of 30's wire. (8) Rotating tickler, say, 16 turns 30's, (9) Secondary coil of R.F. transformer: 22's wire, spaced, tapped 15th from filament or primary end. (10) Secondary tuning condenser. (11) Grid leak, 2 to 4 megs, and condenser, .00025. (12) Detector valve, medium or high impedance. (13) Detector rheostat, 30 ohms. (14) Fixed .001 condenser over 'phones or primary of transformer. (15) First audio transformer, or resistance unit. (16) First amplifier valve, low impedance. (17) Ferranti A.F.3 transformer. (18) Grid bias or C battery, voltage to suit valves. (19) Second amplifier, power or super-power valve. (21) Output choke, 20 to 50 henries, (22) Fixed condenser, 2 mfds. (23) Loud speaker. B1, 2, 3, 4, are connected to various B voltages as required by valves. All wire sizes are S.W.G.

Radio Record, Volume I, Issue 30, 10 February 1928, Page 12

THEORETICAL CIRCUIT DIAGRAM. (1) Aerial series condenser, midget variable or fixed .0001. (2) Aerial inductance, 20's enamel spaced with 24's, tapped at 18th from earth end. (3) Aerial tuning condenser, .0005 mfd. (4) Neutralising condenser, (5) R.F. valve, medium impedance. (6) R.F. rheostat, 30 ohms. (7) Primary of R.F. transformer, 14 to 20 turns of 30's wire. (8) Rotating tickler, say, 16 turns 30's, (9) Secondary coil of R.F. transformer: 22's wire, spaced, tapped 15th from filament or primary end. (10) Secondary tuning condenser. (11) Grid leak, 2 to 4 megs, and condenser, .00025. (12) Detector valve, medium or high impedance. (13) Detector rheostat, 30 ohms. (14) Fixed .001 condenser over 'phones or primary of transformer. (15) First audio transformer, or resistance unit. (16) First amplifier valve, low impedance. (17) Ferranti A.F.3 transformer. (18) Grid bias or C battery, voltage to suit valves. (19) Second amplifier, power or super-power valve. (21) Output choke, 20 to 50 henries, (22) Fixed condenser, 2 mfds. (23) Loud speaker. B1, 2, 3, 4, are connected to various B voltages as required by valves. All wire sizes are S.W.G.