The bottom triode is configured as a grounded-cathode amplifier that sees its plate loaded by a magnified load impedance provided by the top triode, which is configured as an impedance-multiplier. What is an im
TCJ Push-Pull Calculator has but a single purpose: to evaluate tube-based output stages by simulating eight topologies’ (five OTL and three transformer-coupled) actual performance with a specified tube, power supply and bias voltage, and load impedance. The accuracy of the simulation depends on ...
R1 = Rk – R2 So the first step is to specify both the cathode resistor Rk’s value and load impedance. If R2’s value becomes greater than Rk’s value, then the SRPP+ cannot be optimized to work with the selected Rk value and triode. On the other hand, the SRPP+ can be optimize...
Last time, I presented a tube-based power amplifier that looked as if it used a cathode-follower output stage, but didn't. I also showed a tube power amplifier that both looked like and was a true cathode-follower power amplifier. My last post generated much more interest than I had exp...
TCJ Push-Pull Calculator has but a single purpose: to evaluate tube-based output stages by simulating eight topologies’ (five OTL and three transformer-coupled) actual performance with a specified tube, power supply and bias voltage, and load impedance. The accuracy of the simulation depends on...
This push pull amplifier does not provide a balanced/symmetrical drive voltage to top and bottom tubes, which the low-impedance load exposed and infinite load impedance hid (by not allowing the amplifier to work in push pull mode). On the other hand, the XPP amplifier worked substantially bet...
18 October 2009 The Good Old Days Born in 1956, I cannot be expected to remember much of the 1950s proper. As a child in the 60s, I disliked intensely the residue I could see around me of the '50s —the cars, music, fashions, and black-and-white movies. I was smitten with all...