John Linsley Hood 1450
Shunt Feedback RIAA Phono Stage
The Hart Linsley Hood 1450 preamplifier represents the ultimate standard of performance that is available from the microgroove long playing record medium.
The combination of the preferred Shunt Feedback concept and a very advanced discrete component circuit topology designed by John Linsley Hood give a result which is sonically better, with a greater openness of sound than any circuit before.
Having a specially optimised low-impedance front end it is particularly suited to use with moving coil cartridges and for this purpose it even surpasses the widely acclaimed integrated circuit RIAA preamplifier by the same designer.
Both moving coil and moving magnet cartridges can be used, the higher output of the latter being fed into an AC coupled input stage. There is also on-board provision for fitting loading capacitors where moving coil cartridges need this.
An SA (Series Audiophile) version of this excellent kit is available with even higher grade components than the normal version. This comes with capacitors using different dielectrics and with lower ESR electrolytics and selected semiconductors. These sets have SA suffixes.
Normally the K1450 will be used in its own case as near as possible to the turntable to minimise the cable runs carrying the very low level, and therefore vulnerable, pickup cartridge signals.
Frequency response: ±025dB to RIAA curve
Signal to noise ratio: 26dB below record surface noise
Sensitivity (for 500mV output): 37mV (mm), 340pV (mc)
Input impedance: 47k ohms (mm), 100 ohms (mc)
Gain: 134 (mm), 1460 (mc)
Overload: 670mV (mm), 60mV (mc)
Dimensions: 134 x 71 x 225mm
Weight: 700g (preamp), 1.2kg (power supply)
Immediately it was installed the Hart combination made a positive impression, helping extract the very best from the Roksan Xerxes X turntable I reviewed last month. While there may well be even quieter RIAA pre amplifiers available, noise is assuredly not a problem with this new realisation of the shunt feedback circuit, even when using low output, low resistance, moving coil cartridges. Disc surface noise predominates, which means the electronics are effectively silent. Impulse noises, vinyl's inevitable clicks and pops, are also reassuringly unintrusive, which suggests well controlled transient and overload behaviour - Gramophone Magazine April 1997
construction manual - abril
flyer - Ladabug
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John Linsley Hood Phono Amplifiers
John Linsley Hood 1450 / 1450 owners manual, service manuals and schematics are for reference only and the Vinyl Engine bears no responsibility for errors or other inaccuracies. The PDF files are provided under strict licence. Reproduction without prior permission or for financial gain is strictly prohibited. This website is not affiliated with or sponsored by John Linsley Hood.