Since this scheme is about reducing cost (avoid a phase splitter), increasing power supply costs is "stupid". If RK is infinity, it is perfect push-pull.īut if RK is even "very large", it wastes a large fraction of total B+ power. With tweeking, the ratio can get closer to 1. > yes the cathode resistor is an important design consideration. I wonder how it works on "all 6V6 ever made", because 6V6 has low screen current and the residual varies wildly with different factories. If the 6V6 works like most pentodes, this will derive an out of phase signal. One 6V6 screen has an extra resistor and cap coupled to the other 6V6. Note that 6V6 cathode resistor is bypassed.
I left a lot out, and this post is long enough.
This article is no where as detailed as the Amos article.ĭetermination of the i's is circuit dependent, particularly the value of the cathode resistors. subtitled "Constructing a 6-watt amplifier in which the output tubes serve as their own phase inverter. (#492,407 and #508,697) I would recommend another ariticle: Compact Hi-FI power amplifier by melvin liebowitz/ Delaware Electronics Supply Co. This includes the article mentioned above, and copies of the two patents mentioned in the article. My guess, would be to put together a spread sheet and model the impact of the choices.Ĭ. Familarize your self with the design aspects, Like any tube design, there are unlimited choices of components, and the inter-relationship between component choices. Use pentode tubes, you will have a greater output.ī. If you choose to use self split output Ī. I quoted an article found in Wireless Engineer by Amos dated February 1946, With the Title "Push-Pull Analysis, Subtitled "Cathode-Coupled Output Stage".įrom this article, I make the following recommendations to you.ġ. I enjoy the questions and issues you raise in your posts and threads.
Where the self-split power is proportional to i 1 2 + i 2 2Īnd the conventional PP is proportional to 2i 1 2 And yes the cathode resistor is an important design consideration. From what I could determine, there is no fixed ratio, but PRR's number is an excellent starting point.
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