The amplifier according to the circuit Loftin-White from Anatoly Manakov
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the Amplifier is executed by img src on lamps, 6г2 which serves as the amplifier of tension (driver) for a lamp of the terminal cascade - 2А3 with direct connection of a grid 2А3 in an anode chain 6Г2. Non-working legs of a lamp 6Г2 are connected on the case. For observance of an operating mode of a target lamp 2А3, a lamp food 6Г2 is executed symmetric concerning the cathode of a target lamp with «the virtual earth», the R7 resistor serves for control of a current of rest of the target cascade 60мА which is determined by power failure 0,06В on the R6 resistor. Preliminary control becomes so: The grid day off of a lamp is disconnected from the anode of the driver and of 1 Ohm becomes isolated on the cathodic resistor. On the anode of a lamp of the driver tension - 50-55B concerning a point In (an average point of an anode winding of the power transformer) is exposed. Then the grid day off of a lamp is connected to the anode of the driver and final control on a current of the anode of a target lamp which should be about 60мА at power failure 0,06В on the R6 resistor face value of 1 Ohm is made. D311 diodes in a nakalno-cathodic chain of a lamp 2А3 it is possible to replace of 10 Ohm with resistors. Electrolytic condensers 200мкФ are calculated on working tension 400В, С2 on working tension 10В. P align = "center" >
the Circuit of the power unit is executed by p on кенотроне 5Ц3С or 5Ц4С which serves for tension straightening on plus, and the double diode 6Х2П straightening tension on a minus for a food of a lamp of the driver 6Г2. Inclusion of an anode food by the toggle-switch in a heat chain кенотрона after five-minute warming up of lamps.
the Amplifier is easily adjusted by p at application of serviceable lamps and details. Besides it is extremely desirable to apply the most quality details. What details are applied by me, I do not write meaningly, giving the chance to independent selection of components for sounding. Despite seeming simplicity of the circuit, the amplifier has good sounding. Sensitivity of the amplifier - 0,7В, target capacity - 2,8 W at KNI to 1,5-2 %.
the Power transformer is executed by p on Sh30kh50 iron. Target transformers are executed on ShLM 32х50 iron, the anode winding has 2502 rounds in three sections on 834, the wire 0,25, a secondary winding for loading of 4 Ohm consists from 4х sections on 100витков the wires 0,71, the first section of a secondary winding is halved for possibility of connection of loading of 8 Ohm. At connection of all four sections parallel it is consecutive on two, connection of loading of 16 Ohm is possible. Not magnetic laying in a gap of target transformers-0,12мМ.
the Amplifier is calculated by p on construction by the fans having some experience in construction and control of lamp designs.Good luck
of River of S. the schematic diagram is executed by Evgeny Razumov.!>