The ST25 Mk2 is an affordable version of some of Icon’s “posher” amplifiers. We think it’s a cracker and almost certainly the best integrated valve amp available at anything like the price.
Contrary to the norm, where it’s assumed a valve amp of this sort will only handle simple efficient speakers – this amp will gladly run a wide range of speakers, old and new, making it far more versatile within a contemporary system.
The new ST25 MKII retains all the important features of the ST40 MKII, yet is excellent value for money. New features include the excellent 6SN7 and 6SL7 valves for improved sound, and a headphone out with excellent performance.
Many of customers like to experiment with different valves, so the ST25 MK II is designed to use: 6L6, EL34, 6CA7, KT66, KT77, KT88, 6550. Let us know if you’d like one of these variants.
The simplified bias circuit means that valve replacement of the same type requires no bias adjustment.
Specification & Features
(Typical conditions EL34 valves@ 240v 50Hz. 8 Ω) • 6L6/EL34/6CA7/KT66/KT88/6550 output valves • 6SN7/6SL7 double triode driver valves • Class A, all Triode front end • Ultralinear output circuit • Can be supplied in triode output by request 15+15w • Hand wired point to point. No printed circuit board • 30w RMS per channel Ultralinear • 4 and 8ohm loudspeaker output • Frequency response 20-20khz +0 – 0.5db • THD typically less 0.2% 1kHz • Hand wound transformers • Attractive valve cover included in the price • Hi Fi quality Solen capacitors • Silver TEFLON audio cable • Gold plated Input & speaker sockets • 3 line Inputs for CD, Tuner, Phono etc • 250 mv input for full output • 220/240volts, 100w (180w max) • 34W, 34D, 21H (overall) 17kg • CE, ROHS & WEEE compliant • Comprehensive manual supplied