Pulltube review9/13/2023 ![]() Photograph 1: Poddwatt Class-A Stereo EL84 (6BQ5) Vacuum Tube Amplifier If you don't exceed the power limits it will provide sound quality that is easy to listen to with great detail and clarity. I was very surprised how well this amplifier sounds. There is plenty of bottom end, just not as much as the bigger amplifiers like the KT88 Odd Blocks which use much larger audio output transformers. The amplifier is quite clean from 25 Hz to past 20kHz (see the measurements in Tables 1 and 2 below). The end result is a great DIY project for those of you who need 5 to 7 watts of high quality sound. The earlier project with the ECC802S driver tube did not have sufficient gain for this. This was done to allow the direct connection (via headphone jack) of MP3 players to the tube amp. One area of particular note is the higher gain of this new tube amp. A number of circuit refinements have been included as well. This alone makes for a $40 to $50 savings. The rather large output transformers used in the original project have been replaced by ones that are considerably less weighty and less costly. ![]() Most notably it is easier and less costly to build. The basic circuits are rather similar, but the new project has a number of differences. Both tube amplifier projects use EL84 / 6BQ5 tubes and the earlier one used a ECC802S driver while this one uses 5751 driver tubes. It has more than a casual similarity to the first Push-Pull EL84 (6BQ5) Oddwatt project from nearly two years ago. This project is related to the other tube amplifier projects I have posted. Poddwatt: 5751 SRPP / Push-Pull EL84 (6BQ5) Tube Stereo Amplifier ![]()
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