AES Journal Forum

Large-Signal Analysis of Class A Vacuum Triode Push—Pull Output Stage

Document Thumbnail

[Engineering Report] A mathematical model for the input–output characteristic of a class A push–pull output stage using triode vacuum tube amplifiers is presented. The model, basically a sine series function, can easily yield closed-form series expressions for the amplitudes of the output components resulting from multisinusoidal input signals to the output stage. The special case of an equal-amplitude two-tone input signal is considered in detail. The results show that, similar to a transistor-based class A output stage, the vacuum triode class A output stage generates only odd-order harmonic and intermodulation components. The results also show that the amplitudes of these components are strongly dependent on the amount of cathode feedback and the amplitudes of the input tones. For sufficiently small input tone amplitudes, the relative harmonic and intermodulation products are too small and their magnitudes are within or close to the error range of the Fourier series approximation. However, for relatively large input tone amplitudes the relative harmonic and intermodulation components are increasing monotonically with the input tone amplitudes.

JAES Volume 53 Issue 6 pp. 509-517; June 2005
Publication Date:

Click to purchase paper as a non-member or you can login as an AES member to see more options.

No AES members have commented on this paper yet.

Subscribe to this discussion

RSS Feed To be notified of new comments on this paper you can subscribe to this RSS feed. Forum users should login to see additional options.

Start a discussion!

If you would like to start a discussion about this paper and are an AES member then you can login here:

If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.

AES - Audio Engineering Society