GSP Audio - Jazz Club
This phono stage/preamp features a number of different equalization curves in addition to the fixed RIAA curve you get with a regular phono stage/preamp. It's an essential phono stage/preamp for the archivist and listeners who play antique records. Its switch-matrix equalisation gives immediate results saving the guesswork of digital manipulation.
More than that, its Era Gold V based fast circuit "rides" the clicks: its propagation speed input to output, and negative feedback too, are so fast that clicks and pops are controlled - not exaggerated like with run-of-the-mill phono stage preamps. The result is a reduction of record noise, and for the archivist that means less "cleaning-up".
Add to that the "miraculous" Era Gold V musicality - the platform on which the Jazz Club is built - and early recordings regain more of the life, colour and sparkle locked in their grooves.
"Even my earliest LP, a 1949 American Decca pressing of Oklahoma leapt to life in an energising manner that defied its years"
Tony Bolton, Hi-Fi News
78s were from the pioneering days of the phonograph. Each record label had its own idea as to the best cutting curve and therefore the EQ varied considerably between record labels (and record label alliances). The Jazz Club features eight identified EQ curves for 78 RPM records.
With LPs and EPs (extended play "singles") the story was much the same, but as can be seen by the reduced number of curves, record label EQs were starting to converge.
For today's RIAA LPs and singles (the record industry standard curve officially introduced in 1954) the Jazz Club is sonically identical to the Era Gold V - the only circuit layout difference is that its RIAA de-emphasis components are situated in the EQ switch-matrix.
Even some modern pressings can benefit by applying the 10kHz NAB cut (-16dB) instead of RIAA (-13.7dB) - notably some toppy sounding Tamla Motown and other recordings that are unusually bright. It may not be due to record labels clinging to the older NAB EQ - it's more likely to be the generous 2dB tolerance allowed by the RIAA standard.
The Jazz Club, though superseded by the Revelation phono stage preamp, is still available due to popular demand.
|Input Range||2mV - 10mV|
|Output||252mV - 1260mV for input range above|
|Gain||42dB (126) @ 1kHz|
|Input Impedance||47k Ohms plus 100pF|
|Output (driving/source) Impedance||1.2k Ohms|
|Recommended Load Impedance||10k Ohms or greater|
|Noise at Output||-65dB CCIR Q-pk|
|Size||W: 107 x H: 50 x D: 180(mm) inc. jacks|