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Special SE Single Ended 25 WPC Amplifier

Special SE Single Ended 25 WPC Amplifier


This is my "Special" design of the KT88 amp that is essentially on steroids, with a switch that changes the cathode current to allow either 88's, 120's or 150's to be used. Capable of 25 watts R.M.S. per channel, with variable Negative Feedback and a 20-35,000hz frequency response.

The design goal was to achieve the 3D, Lifelike presentation of an SE amp, with enough power and bass to drive even low efficiency speakers with weight and punch.

Hammond 30 watt output transformers, Hammond power transformer and choke are employed along with a 5AR4 rectifier and Audyn Cap-Plus capacitors to take my KT88 design to the next level! The Mahogany side panels and custom aluminum badge on the front add to the aesthetics.

A pair of 12AX7 driver tubes is used to push each channel to full output without using a preamplifier, and these can be subbed for lower gain tubes (like the 12au7 or 12at7) when one of my preamplifiers are employed. This amp BREATHES 3D, lifelike power into even inefficient 4, 8 or 16 Ohm loudspeakers (85 db @ 1W minimum).