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It combines the advantages of single-stroke and push-pull. The circuit itself, in my opinion, is quite interesting and non-trivial. Running a little ahead, I will say that the amplifier develops an output power of 10 W with an input voltage of 0.5 V. ULF push-pull circuitĪs a result of experiments and small changes, I got such a scheme. And it is not known how much these bulbs would be in my possession if I had not come across Pavlov's scheme. I tried Loftin-White in the same cycle, but I was not satisfied with it. For some time they were lying in my “bedside table”, then I decided to cross them with 6P3S-E, and I wanted the circuit without transition tanks. For nothing, just like it, and inexpensively. The history of this amplifier began that day when I absolutely aimlessly bought two EF22 Tesla bulbs on the market. The harmonic distortion coefficient of the amplifier is about 2.5%, the sensitivity is about 0.1 V Using R1, the frequency response in the high-frequency region is regulated, with R2-in the low-frequency region. The depth of feedback is three (1 + B K = 3). Negative feedback covers the part of the amplifier, consisting of cascades: push-pull together with an output transformer, phase-inverse and preliminary on a single triode lamp 6N2P. The phase inverse cascade is made on one triode of a 6N2P lamp, the second triode plays the role of a preliminary amplifier.

The output power of the amplifier is about 10 V * A. It provides a signal amplification of 27 times, resulting in an amplifier sensitivity of about 0.3 V.Īmplifier circuit with push-pull output stage, negative feedback and frequency correction. The pre-amplification stage is made on one of the triodes of the 6N3P lamp. The output stage is made on a 6P14P lamp operating in a typical mode. This adjustment is recommended not only when setting up the amplifier, but also when changing lamps. The output signal in this case should be maximum. After that, the switch B1 is set to a different position, and antiphase voltages are thereby applied to the lamp grids. The lamp cascade can be balanced in the following simple way: the voltage of the same phase is applied to the lamp grids of the output stage and regulated by the variable resistor R1, the minimum signal at the amplifier output is achieved (switch B1 is in this position in the lower position of the circuit). Measurement readings are compared with similar measurements for a new lamp and determine the degree of emission loss of the lamp being tested.Ī push-pull bass amplifier will work fine only if its shoulders are symmetrical. For a new lamp, the resistance of the gap between the filament and the control grid can be, for example, 900, for the used 2000, for those who have lost emissions - 4000. To determine the emission of the lamp, you can use an ohmmeter fig.

In double lamps, it makes sense to determine the 'half' of the lamp for which the arrow of the device deviates more. The more the arrow of the device deviates to the right, the better the emission, and therefore the lamp. No voltage is applied to the remaining electrodes of the lamp. 120 s, a milliammeter is connected (scale 300mA or less). but first turn on the lamp filament circuit. The utility also integrates with the Notification Center to send completion alerts.To check the emission of the electron lamp in fig.

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