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From Music, Sound and Personalities: The 2007 CES and T.H.E. SHOW by Dave Glackin, on Positive-Feedback.com
The Most Interesting Transformer Manufacturer in the show was Jack Elliano of Electra-Print. Jack is pictured here in his lab, one evening after the show. He actually has a rather large facility, with a staggering array of tubes, electronics, loudspeakers, parts, and whatnot. He manufactures transformers, chokes, and custom amplifiers. Jack learned transformer design and manufacture from a fellow who worked at Peerless, and he has a reputation for building high-quality components. Jack showed me the circuit diagram for a 21-watt SET amplifier using a Sovtek 6A3 ...a pretty amazing output spec. Jack connected some famous-manufacturer mylar capacitors to a signal generator, and demonstrated how they act as electrostatic loudspeakers, producing an audible tone when driven in this manner. Each has different resonance points. Paper capacitors do not do this, and that is what Jack uses in his designs. Thanks for a most educational evening, Jack!
Dave Glackin, Positive Feedback Online, Issue 30
Our Electra-Print design of this EL-84 P-P Integrated amplifier is a custom built with a circuit that is simple, clean, tried and true. It is able to deliver power to several speaker arrangements in the 95 to 98db SPL range. Low source impedance is provided by its push-pull output without feedback, which makes it unique.
Electra-Prints circuit design has the ability to reduce crossover distortion without feedback due to the terminated autoformer driver. This type of distortion is due to signal level moving the bias and the lamination material remagnetizing (hysteresis). The low DCR of the autoformer in the bias path allows little change of bias and the remagnetizing is reduced with M6 laminations. A traditional P-P tube output stage with a resistor/capacitor coupled drive circuit has a sum/difference from signal and high impedance bias voltage (through grid resistor), that will change the operating point continuously, therefore increasing crossover distortion.
Another feature is an input transformer (nickel lamination type) to match most conventional CD players which have low output impedance to a constant load. A slight step-up eliminates the need for a line amp plus a second input is available for other line level devices.
All chassis and transformer containers are made of non magnetic material. This reduces the overall noise level from power transformer and filter choke distributed magnetic fields.
An OpAmp driver allows a variable gain for signal source choices. Two separate common grounds designed in this amplifier (one for the OpAmp and one for the tube amplifier) further reduce ground loops.