Online Parts International Promotions Catalogue DIY Class A 6J5 HIFI Headphone Amplifier Vacuum Tube Preamplifier Kit DIY Class A 6J5 HIFI Headphone Amplifier Vacuum Tube Preamplifier Kit Specification: Size: 77mm * 75mm (L*W) Weight: 79g Frequency: 16 HZ – 28.5KHZ Headphone impedance: 16-600Ω SNR: > 108db Channel separation: <-100db Distortion: <0.003% (distortion noise but not all, […]



  Online Parts International A very big trend for some time now is for the home DIYer to build his own switched mode power supply.  These power supplies when run from the mains electrical supply if not designed by a professional company which specialises in mains switching circuits can be downright deadly. Why not try a few […]



Online Parts International Promotions Catalogue This is an affiliates page which hopefully will pay for the maintenance of this website one way or another.  Having personally tested the Dc-DC 10-32V to 12-35V mobile switcher it works very well – note though that the power supply does not have isolated (-) and (+) poles.  The input (-) and […]

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