Upgraded transformer4 Upgraded capacitors4 X Siemens E88CC Gold pin Tubes (Minimum £300)In excellent working orderFantastic expansive sound stage, side to side and back to frontTested against the Audio Research LS16 and LS25.This pre, held its own with both and excelled in some areas.This is a very Hi end Pre ampI have been running it for a few years. Please buy with full confidence.All the original parts come with it, if you, for some reason wanted to revert it back to its original state. Though, for sound quality I would not recommend it...!!Also comes with the original Booklet/Manual. Frame has been braced for more solidity, see photos.Only selling due to my new amps being very high in gain and I have to use a passive pre.DEMO WELCOME

ORIGINAL AUDIO RESEARCH LS7 OWNERS MANUAL NICE

Audio Research Ls7 Tube Preamp. Condition is Used. Shipped with USPS Ground Advantage.

For Acustic Reserch 44BX, Rogers (LS7t, LS4a or LS2a/2?) SEAS 19TAF/G H414 8ohm 40/88 Tweeter (from LS6a). and many others 19mm High Fidelity dome tweeter with smooth, extended frequency response. Aluminium diaphragm suspended by a specially designed soft Sonotex surround which allows a low fundamental frequency. Injection moulded chassis in high grade glass fibre reinforced plastic keeps the moving parts in perfect alignment and provides good coupling to the cabinet. Fine mesh grid protects the diaphragm and carries a phase plate which compensates for a slight axial roll off towards 20 kHz. Voice coil windings immersed in magnetic fluid increase short term power handling capacity and reduce the compression at high power levels

For Acustic Reserch 44BX, Rogers (LS7t, LS4a or LS2a/2?) SEAS 19TAF/G H414 8ohm 40/88 Tweeter (from LS6a). and many others 19mm High Fidelity dome tweeter with smooth, extended frequency response. Aluminium diaphragm suspended by a specially designed soft Sonotex surround which allows a low fundamental frequency. Injection moulded chassis in high grade glass fibre reinforced plastic keeps the moving parts in perfect alignment and provides good coupling to the cabinet. Fine mesh grid protects the diaphragm and carries a phase plate which compensates for a slight axial roll off towards 20 kHz. Voice coil windings immersed in magnetic fluid increase short term power handling capacity and reduce the compression at high power levels

For Acustic Reserch 44BX, Rogers (LS7t, LS4a or LS2a/2?) SEAS 19TAF/G H414 8ohm 40/88 Tweeter (from LS6a). and many others 19mm High Fidelity dome tweeter with smooth, extended frequency response. Aluminium diaphragm suspended by a specially designed soft Sonotex surround which allows a low fundamental frequency. Injection moulded chassis in high grade glass fibre reinforced plastic keeps the moving parts in perfect alignment and provides good coupling to the cabinet. Fine mesh grid protects the diaphragm and carries a phase plate which compensates for a slight axial roll off towards 20 kHz. Voice coil windings immersed in magnetic fluid increase short term power handling capacity and reduce the compression at high power levels

For Acustic Reserch 44BX, Rogers (LS7t, LS4a or LS2a/2?) SEAS 19TAF/G H414 8ohm 40/88 Tweeter (from LS6a). and many others 19mm High Fidelity dome tweeter with smooth, extended frequency response. Aluminium diaphragm suspended by a specially designed soft Sonotex surround which allows a low fundamental frequency. Injection moulded chassis in high grade glass fibre reinforced plastic keeps the moving parts in perfect alignment and provides good coupling to the cabinet. Fine mesh grid protects the diaphragm and carries a phase plate which compensates for a slight axial roll off towards 20 kHz. Voice coil windings immersed in magnetic fluid increase short term power handling capacity and reduce the compression at high power levels