Reply to Loftin-White from Komissarov. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Tube Power Amplifiers

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To make the amplifier sound good, you must first of all take care of the highest possible quality of the components used, especially since there are very few of them in this circuit.

The above scheme is quite formal and leaves a lot of freedom for creativity, try it yourself!

What can be applied? The choice is quite large. The output is 2A3, 6B4G, AD1, 6C4C, 2C4C, in addition, there are suitable indirectly heated lamps, including triode pentodes.

Yes, here it must be said about the cathode circuits of direct-incandescent lamps. I recommend feeding the filament with a rectified and filtered voltage, the rectifier should be assembled on "fast" diodes shunted with 1000 pF mica capacitors. The filament is grounded through the midpoint of two 10Ω 2W resistors connected to the two ends of the filament.

Entrance lamp - 6N23P, 6N1P, 6922, E88CC, E188SS.

Power capacitors will have a fundamental effect on the sound. If possible, put BG WKZ, no - try paper in oil (if MBG ..., do not forget to remove it from the steel case),

At the input stage, 68-100mF is enough, but at the output stage (not shown in the diagram, it is part of the "upper" PSU) I do not recommend less than 150mF.

The cathode capacitor must be the same type as the capacitor in the power supply.

Power supplies with kenotron rectification and single-section CLC filters (although CRC can be used in the "lower" one, but the sound will be better with the first one).

The offset of the output lamp is set by the values ​​of the 20K resistors and the variable 4K7.

What you need to remember is that the ground-anode voltage of the "upper" 6N23P should be about 400V, the current will be 4-5mA, the voltage on the grid of the output lamp is 204V.

Fine adjustment of the quiescent current is carried out by a variable resistor. It is controlled by the voltage drop across the 1Ω resistor.

At the first start, I recommend that you make sure that the output lamp is deliberately "covered".

The output stage operates with a load of 2K5-3K5 at a current of 50mA, the cathode-grid voltage is about -45V, plus or minus the parameters of a particular lamp.

The choice is wide, in descending order: Tamura, Tango (ISO corp.), Sowther, AudioNote, Lundahl...

Do not save, get good trances, they will not be lost, and you will not regret it.

Author: Eugen Komissarov (Evgeny Komissarov), eugenNOZPAM@pccenter.ru; Publication: cxem.net

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