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TK Audio SP501 Class A Preamp  From TK Audio

Offering multiple different tonalities through on-board output stage switching options, TK's SP501 preamp gives you an incredible range of tones to choose from! From fat and round to punchy and crunchy, the SP501 delivers TK's signature top-tier sound along with impressive tonal flexibility.

TK Audio


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Manufacturer's Description from TK Audio

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


TK Audio

About Manufacturer

TK Audio is based in Halmstad, a small town in the southwest of Sweden. It started out in 2008 as an additional brand to Vintagedesign as we wanted to develop products with a bit more modern style. Thomas Kristiansson (or TK as his friends call him) is the mastermind behind both Vintagedesign and TK Audio and he has been working with electronics, cords and sounds in different kinds of professions his entire career.
Our philosophy is to produce creative audio solutions and assemble them in Sweden.
We buy the chassis from a local manufacturer and the main part of the panels is also produced nearby. Up until just recently we have assembled and soldered the circuit boards by ourselves but as the demand for our products has increased we can´t keep up so now we also use another company to help us out. They are situated just a 2 hour drive from Halmstad so we can still proudly say that our products are hand made in Sweden. We take responsibility for keeping our production as environmental friendly as possible and by having full control over the production and of course making all the final assembling by ourselves we can make sure that the quality always is top notch!


Power requirement: +130mA / -130mA
Input impedance: 1600 / 400 ohm
Instrument input impedance: Higher than 2Mohm
Max output level: +24dBu