Passive Transformer  Pre Amplifiers

This is an astonishingly good sounding preamp. It is unpowered and uses multiple windings on transformers. The substantial volume pots and transformers are all made in house, following 20 years of development.  Giving 6dB of gain, the sound is lush and detailed, with a huge soundstage, with excellent separation and a dead silent background.

Price: Please contact us for pricing on this special product.         

The Silver version uses a square section pure silver, 24 carrot gold wiring in all crucial signal paths and in the umbilical cord from the power supply. 

This is an eye/ear opening pre amp. I was always sceptical about any sort of passive preamp, as they had some good points, but squashed dynamics and narrowed and shortened soundstages and micro dynamics suffered, like the instantaneous start of a note on a guitar, banjo or bell. This preamp does none of those things. Micro dynamics and sound staging is fantastic, but there is a clarity and silence between the notes and the inky silent background is wonderful. Other powered preamps sound thick and hazy across the soundstage in comparison. 805 of the preamps I sell are the Transformer type. No warm up time is also a bonus. The only down side is no remote control, due to the Ultimate Quality multi step selector.

Technical details 
As a serious high end Passive Preamplifier, the AM passive is essentially unbreakable. There are no coupling capacitors to age or blow up, no resistors to fail. The AM units are true isolation transformers, with separate primary and secondary windings. Gain in most preamps is redundant when the majority of amplifiers are driven to full output by the source voltage. Superior amplifiers don't need assistance from preamps except for the bare functionality of attenuation and input switching. If you already own a high level amplifier, the AM will be the best match to make your amp shine. With full bandwidth, regardless of setting and no impedance problems, this is a passive that doesn't sound flat, boring and bereft of life, especially used in balanced mode. 

The use of 4 transformers attenuation is now with 33 volume steps. The selector is of exceptionally high quality.
Ture balance input/output design with four transformers attenuation which isolates components, break ground loop problem, and reduce noise. 
33 step volume attenuation with remote control based on 33 transformer output terminals. 
3 single-ended or RCA input, 3 balanced or XLR input .
2 single-ended or RCA output, 2 balanced or XLR output .
Point to point hand wiring with Teflon coated solid core copper wires. 
Full Heavy duty refined aluminium alloy body, and faceplate. 
6dB passive gain, so low gain amplifiers can be driven to their maximum efficiency by components that otherwise might require active boosting. 
Dimensions: 18" W x 12" D x 7" H 
Weight: 8.5 Kg net; 11 Kg shipping weight 
Warranty: 3 years parts and labor 


Osborn Loudspeakers

+613 9390 1564

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