Push-pull amplifier on a 6S4S lamp. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Tube Power Amplifiers
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The amplifier is based on a traditional transformer-coupled circuit. The highlight is in the fixed bias of both the output stage (from a separate unstabilized source) and the input stage - a lithium battery in the grid circuit.
In fact, the 6S45P lamp (the choice was determined by the minimum output impedance at large mu) in this circuit operates far beyond the passport OBR (anode voltage 220 ... 250 V, the resistance in the grid circuit is twice the maximum), but it works confidently, without excitation and without drift of the operating point - practically, at the limit of permissible power. The bandwidth at the bottom is determined almost exclusively by the combination of the Ra of the input tube and the L of the interstage primary. Of course, the 6N30P has a smaller Ra, but... the two-stage driver on the 6N30P did not sound as good as the 6S45P (either with battery heating or with traditional ones).
The amplifier is made integrated mono - do not ask why, I wanted to. This is an "amplifier for the kitchen", self-sufficient and small - everything fits in 38 * 22 * 22 cm. An input selector (with the possibility of a stereo-to-mono adder) and a discrete shunt volume control have been added. Despite the fact that the shunt breaks when the biscuit is switched, this does not create any particular inconvenience.
(click to enlarge)
Transformers: interstage Lundahl 1660-10mA in Alt-U switching, output Lundahl 1623-PP in switching on the secondary winding Alt-B (all primary windings in series), power supply - custom T190 from Electron-complex, anode choke from the Golden Mean, choke in the bias filter D23, such a green one. Output lamps - Svetlanov's (what was in the chest. Yes, everything was there ... and a lot more was left). Lithium battery - any 3-volt tablet with solder pins. Do not try to solder ordinary tablets without leads - nothing good will come of it.
The potentiometer in the filament circuit of the output stage can be replaced with a pair of 10-30 Ohm resistors, or it can be completely eliminated (by grounding one of the filament wires) - this practically does not affect the background, the output is a couple of mV noise. A single-ohm resistor in the 6C4C cathode circuit - an ammeter shunt, was selected for the existing head.
Publication: klausmobile.narod.ru
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