Transformerless push-pull amplifier Mammoth-1. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Tube Power Amplifiers
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Transformerless push-pull amplifier Mammoth-1 built on the ideas of Ralph Karsten's Atma-Sphere M-60 amplifiers, atma-sphere.com/m60.htm. The circlotron is very simple!
As they came up with in the mid-50s, they still do it today. The only voltage amplification stage, it is also a phase inverter (differential cascode for 6H8C) + cathode follower + circlotron output for eight 6H13C (mode Ua = 150V, Ia = 70mA, Ug = -65V - what anode trances got). One pair of separating containers.
(click to enlarge)
The gain of the input stage is 26.0 on the left, 25.8 on the right shoulder. At 1V at the input at an 8-ohm load, the voltage is 15V (about 30W power), this is just the border of the A-AB class. I have not tried to measure power in the AB class "for slaughter" yet - bring your light bulbs, we'll check it. A change from the original - Allen Wright's cathode follower - the V5 lamp operates with constant current (source on V6) and at constant anode-cathode voltage (follower on V4, highlighted in red).
The components are all ordinary, a lot of used parts from the Tsaritsyno market (transmissions TPP311, TA262, TN40, TA23, Nichicon 10.000x200V capacities), signal capacitors MBM - the entire budget was within less than 250 ye per monoblock, of this amount 3/4 is the power supply. With custom trans will be more expensive. Still, 700W overall power... By the way!!! In the entire batch of Svetlanov 6N13S 1977, the filament current turned out to be not 2.8A but 3.0-3.3A. Gift...
The amplifier is arranged as a three-storey one on an H-shaped wooden (solid beech) chassis. Transoms (bottom) and containers (top) live on the crossbar of the letter H, and instead of a lid there is a getinax plate with lamps.
The delay relay for turning on the anode power supply of the driver (T1=60s) and the output (T2=T1+15s) is a traditional Claus design on the TL431. The power supply of the driver - with a stone (albeit hexfred) rectifier - does not suit me. It's time to switch to kenotrons.
Power output lamps - almost everything as in transistor amplifiers. Those. capacities are the same (2x13300 microfarads), and the voltage is 200V. Expensive pleasure
When switching the windings of the rod trance "in the mind" (Fig. A), the output signal bandwidth was limited to 70 kHz (-3dB). It turned out that the interwinding capacitance of the trance plays. I switched the secondary circuits "as it should not" (Fig. B) - and the band is now 7Hz-100kHz (-1dB. Further - the generator was not enough, it is still low-frequency ...). The trans doesn't sound like it.
In addition to the control ammeter, the Mammoth also has a shoulder balance null indicator (connected to the output terminals)
That's how it started. 3mm copper cathode busbars are soldered directly into the acoustic clamps. Hinged mounting on the support petals, signal jumpers made of 0.8 mm copper core. Colored containers - MBM (so that no one would guess). For the convenience of debugging, I made the top board removable, power is supplied by RP10 connectors.
Here are the main power capacities - Nichicon 10,000 * 200V. Does it inspire?
And this is how it looked when debugging. It's not big (but heavy...)...
Acknowledgments, links, notes
- Website of Atma-Sphere and its founder Ralph Carsten, atma-sphere.com
- Site of Atma-Sphere amplifier owners, otlamp.com
- The History of the Circlotron, circlotron.tripod.com
- Allen Wright cathode follower, vacuumstate.com
Publication: klausmobile.narod.ru
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