Clauscorrector-I. Two-stage amplifier with passive correction on lamps 6S4P, 6F12P, 6F12P. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Tube Power Amplifiers

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The unit found its place at Genn's and for some reason does not want to return home ... The corrector itself is a banal two-stage with passive correction on not quite banal lamps - 6S4P and 6F12P (triode part). In general, it was Genn who led me to 6F12P, and Sergey Rubtsov led him, and his ...

(click to enlarge)

Compared to this circuit, one change was made almost immediately - C1 was moved, now it is AFTER the correction filter, and the filter capacitances are now energized. As Girius rightly noted, the values ​​in the correction circuit are not entirely correct. Something has been replaced by ear, something reflects the existing distortions in the path and the author's idea of ​​\u50b\uXNUMXbwhat is good and what is bad. However, Genn also changed something there... Grid alkaline batteries are soldered directly into the circuit - like this. Don't even think about using cheap battery containers... Batteries are perfectly solderable, a little heat will not kill them (but lithium tablets cannot be soldered). By the way, in a year and a half of operation, the batteries lost about XNUMXmV of voltage (there is no current selection, only self-discharge).

Structurally, the corrector lives in an aluminum instrument case, divided by steel partitions into three compartments (iron; anode stabilizer; preamplifier). The transformer is excessively large, 250 watts from the Electron complex. The incandescent stabilizer is described at klausmobile.narod.ru/appnotes/an_11_fetreg_r.htm, exactly what is photographed there.

The anode source starts with a fast hex-fred rectifier and a choke input. A small capacitance at the input (0-4 uF) allows you to adjust the output voltage without changing the inductive nature of the filter. A parametric stabilizer with a zener diode current source is a typical solution, for example, from Conrad Johnson.

(click to enlarge)

Changes in the circuit - the LED of the left according to the optocoupler circuit is connected in parallel to the second one (to the output of the time relay).

Automation is powered by a filament rectifier. Charging of the filter capacitances starts immediately after the power is turned on. And the stabilizer is turned off until the relay on ST1-IC1 and the normally closed optocoupler (KR293KP9V) turns on and allows C6 to be charged through the current source on D4-Q2 (I don’t remember exactly what transistors there are). Until this happens, the second (normally open) half of KR293KP9A allows the flow of current through the discharge chain on Q1 (highlighted in blue frame) - in order to avoid excess voltage on the filter capacitances. When turned off, the time-setting capacitance CT1 quickly discharges through the filaments, the relay turns off, and the discharge chain opens again, discharging the residual voltage on the filter capacitances.

Acknowledgments, links, notes

• Similar stabilizer circuits from Conrad Johnson on the Federico Paoletti website, pi.infn.it/~federico/further.htm
• Chris Brady, teresaudio.com/haven

Publication: klausmobile.narod.ru

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