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Morrow's Nova: Here in the ARRL lab we found that the 6AQ5, operated as a tetrode clamper, will draw approximately 30 mA plate current under the following conditions: E p 500 volt plate-dropping resistor 15 kΩ E g2 130 volts g2 13 mA E g1 0 volt.14.Feb. Also the schematic has only one triode gain stage. Choose a coupling cap that limits bass to 80Hz, same with cathode bypass caps no need for the amp to have gain in the low bass. Under the same conditions, a conventional triode clamper held the current to no less than 100 mA. A guitar amp will try and boost the mid range and kill the highs and the lows. The TU-8150 is the little brother to the TU-8200 and allows for both tube and. The writer has used both the 6AK6 and the 6AQ5 to clamp a 6146 to 15 mA when the amplifier was operating with 360 volts on the plate. Elekit TU-8150SE 6AQ5/6V6 Single Tube Amp Kit. The above circuit will be of special interest to anyone who wants to clamp a 6146 - a tough tube to hold down. A simple series-dropping resistor may be used between the supply and the screen if the voltage does not rise too high when the clamper tube is cut off.
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If this system is employed, it may be necessary to tap the screen onto a voltage divider connected between the h.v.
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It is logical to assume that the screen-grid voltage for the tetrode clamper could be obtained from the amplifier high-voltage supply if the latter is one of the low-power jobs. Features Ultra linear, triode and pentode modes selectable using a jumper Headphone jack Ample space for larger capacitors Tube Rolling Natively supports 6005W/6AQ5 Supports 6V6 by installing the included PCB adapter Opamp Rolling Includes NJM4580 Opamp Compatible with many other aftermarket Opamps such as Burson Dual-V5i and Dual-V6 Included Tubes 1 x JJ 12AX7/ECC83 2 x 6AQ5W/6005W Included Upgrades AMTRANS AMRT 1/2W Carbon resistors SPECIFICATIONS: Model TU-8150 Circuit configuration. Circuit diagram of the tetrode damper using a miniature tube. A potential of approximately 130 volts appears to be maximum for the 6AQ5.įig. In any event, the applied voltage must be less than the value which will cause the screen-grid dissipation rating to be exceeded. The voltage applied to the screen grid of the 6AQ5 may be obtained from the screen circuit of one of the exciter stages or it may be taken from the low-voltage supply through a dropping resistor. The circuit differs from the standard low-μ triode layout in that the screen of the tube is fed from a fixed voltage source. Gibson also made a GA - 5 which uses a single 6V6 output tube in single ended operation. 1 is the schematic diagram of a clamper circuit which uses a Type 6AQ5 tube. The Gibson GA - 5T uses two 6AQ5 tubes in push - pull output. amplifier) has been reduced to a very low value.įig. Naturally, this feature is ideal for clamper-circuit operation because it means that the protective circuit will continue to draw heavily through the screen-dropping resistor even after the plate voltage (screen voltage for the r.f. Therefore, if the screen voltage of a multigrid tube is maintained as some suitable value, the normal plate current of the tube will not be too greatly affected by reduced plate voltage. Referring to the characteristics of a pentode or a tetrode tube, it will be seen that the plate current is more dependent on screen voltage than it is on plate voltage. After trial, we can safely say that for a given tube the arrangement provides more effective clamper action than does the more commonly used low-μ triode circuit. Home - Techniek - Electronica - Radiotechniek - Radio amateur bladen - QST - Tetrode circuit for clamper tubesĪ space-saving and very practical idea was recently suggested by W2SGJ, using a miniature tube (6AK6, 6AQ5, etc.), connected as a tetrode, in the protective circuit for a screen-grid amplifier.