Tube amplifiers possess a very special tone that musicians want. The amplifier and speaker become part of the musical instrument. We estimate 80% of the market for high-ticket guitar amplifiers are vacuum powered. Brands such as Marshall, Fender, Vox, Ampeg, Yamaha are just a few of the major players that power their high-end amplifiers.
In addition to tube amplifiers, studio recording is influenced by the prevalence of vacuum tube guitar amps in the hands of musicians. Also, classic condenser microphones, microphone preamplifiers, limiters, equalizers and other devices have become valuable collectibles, as various recording engineers discover the value of vacuum tube equipment in obtaining special sound effects. The result has been huge growth in the sales and advertising of vacuum tube- equipped audio processors for recording use
This high impedance amplifier triode is designed specifically for audio use and has a high amplification factor of 100.
This valve is found in todays designs of hi-fi audio amplifiers. In the classic Mullard designs of the 1950’s and 1960’s the valve’s two halves were used as second stage amplification and cathode coupled phase splitter. The phase splitter being required so that the push-pull output stage was driven correctly.
The envelope is 21 mm in diameter and the average diameter for B9A valves is 20 mm. Length excluding pins is 48 mm.
The Ei EL84 is a power amplifier pentode designed for use in the audio frequency power output stage of television and radio receivers and in high fidelity amplifiers.
The performance curves for each tube produced are stored in the computer which controls the test sequence. This same computer then performs the matching algorithm, working from the entire single tube inventory, to find the best matched pair for each order.
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