Clean Audio for TV broadcast: An Object-Based Approach for Hearing-Impaired Viewers - April 2015
Audibility of a CD-Standard A/DA/A Loop Inserted into High-Resolution Audio Playback - September 2007
Sound Board: Food for Thought, Aesthetics in Orchestra Recording - April 2015
A New Transformerless Amplifier Circuit
A transformerless amplifer is described using four tubes connected in a bridge circuit and so driven that each tube delivers equal power to a common load. The ac equivalent circuit of the amplifier may be represented by a generator of voltage 2µe(symbol) in series with the plate resistance rp of one tube. The amplifier is characterized by wide frequency response, low distortion, and good transient response. Negative feedback is easily applied, and there is no direct current flowing through the load. Two complete audio amplifiers are described using this output circuit. One of these delivers 18 w to a load of 200 ohms, with a total intrmodulation distortion of only 0.7%. It weighs only 4 lb, 3 oz, including the power supply and preamplifier. This amplifier circuit is also suitable for use in aircraft equipment and other applications where compactness and light weight are major considerations.
Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.