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TK Audio SP501

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500-series Class A preamp

SP501 is a single slot 500-series class-A unit with a unique hybrid design including both vintage and modern circuits derived from TK’s flagship DP1 stereo preamp. The midrange crunch of the germanium sound of the mid 60’s, the low mid punch and thick sound associated with British Class A from the early 70’s as well as the more modern tone from the 80’s and 90’s are finally all available in a single unit.

SP501’s input stage is built around a high quality Swedish Lundahl transformer followed by a germanium stage that adds more harmonics. Two different output stages can be selected – either an electronically balanced stage, or a discrete transformer-balanced class-A stage sporting a heavy Carnhill output transformer. Vintage Class A mode produces a fat and punchy sound with mid-range character and a warm top end, while the electronically balanced output stage is less colored and perfect for clean amplification. A sweepable HPF from 30Hz to 400Hz allows precision crafting of the low end.


Gain switch in 5dB steps. -25 to 80dB. +5dB to -50 with pad

-30dB pad

48v phantom power

Selectable output stage: vintage transformer balanced class-A or electronically balanced

Germanium drive: inserts a germanium gain stage after the input stage

Sweepable high pass filter, 30-400Hz, 12dB sloop

Polarity switch

Impedance switch: 1600ohm/400ohm

Hi-Z input, instrument input with more than 2Mohm input impedance

Output level control

Illuminated switches, except for the phantom toggle switch

Power requirement: +130mA / -130mA

Input impedance: 1600 / 400 ohm

Instrument input impedance: Higher than 2Mohm

Max output level: +24dBu


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