Single ended driver for transformerless amplifier (Circlotron). Scheme, description

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Single-ended driver for a transformerless amplifier (Circlotron). Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Tube Power Amplifiers

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Actually, it all started with a 6S4S two-stroke. At the beginning was Mullard driver on three 4P1L. Then, instead of one of the lamps, a Lundahl 1660-30mA transformer was installed in the Alt-U configuration according to the datasheet. Here is such a loftin-white turned out (all containers of MBG *, powered through an LC filter). In principle, the Mullard driver was also good, but the gain was not enough. With Loftin, you need only half a volt at the input for full buildup.

(click to enlarge)

Then, taking out 6C4C, I tried this miracle as a driver for Mammoth. Having removed all the driver lamps from the transformerless amplifier, I ran twisted pairs from the Lundal secondary to the Mammoth cathode follower lamp socket (hot ends to the grid tires, cold ends to the bias regulators, led to the grid of the cathode follower lamp). How! And it played much better than the original Karsten cascode!

A few words about 4P1L. Perhaps I came across such a batch ... all lamps have an "average" cathode output asymmetrical. In a push-pull connection, you can still live without a cathode potentiometer, and in a single-cycle cascade, either a potentiometer or DC heating (which I did).

Although instrumentally the lamp has beautiful curves at low currents and voltages, turning on the first lamp with a current of 3, then 6 mA did not give anything good. She played badly. Therefore, it is impossible to give it less than 15mA. Nothing will overheat.

All power noise in this circuit falls on the primary of the transformer (the impedance ratio is approximately 1k lamp: 50k primary). And therefore, in order not to spend a mountain of capacitors on a filter, it is better to choose the upper capacitor (C1) for a minimum of noise - I actually got 32 microfarads.

Publication: klausmobile.narod.ru

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