New Arrivals in the Workshop

It’s been a busy few weeks and the following are just some of the latest amps in for restoration, repair and upgrades. A Radford STA25 is in for repair and upgrade and is having new main electrolytic caps fitted along with upgraded cathode bypass and coupling caps and new bias pots. I am doing a

Yaqin MC13s Upgrades and Switchable Feedback Installed

Another Yaqin 13s on the workbench for the usual upgrades: upgraded coupling capacitors, upgraded grid stopper resistors and fitting of cathode bypass capacitors. These mods worked their usual charms and gave a very decent performance, even with the stock tubes. This time tho, I tried the amp with negative feedback removed. The difference was dramatic,

Yaqin MC 13S Modifications-another giantkiller!

I’m constantly amazed by the results of upgrading Yaqin amps of which I’ve now completed quite a few. I remember my nervousness upgrading the first one as the received wisdom was ‘Chinese transformers are no good’. Yaqin’s transformers are made in house and they claim, are made of Japanese steel.Whatever the ingredients the result is

Yaqin MS 300B Giantkiller for Around a Grand.

    I’ve upgraded many Chinese amps now and I enjoy working on them. Most are fairly easy to work on, and the circuitry can be improved to offer dramatic improvements in sound quality. There are two key questions: Safety Many of these amps are designed to run on 220v, and not our Euro standard

Recent Projects

Some Recent or Completed Projects 1. Valve Amplifiers /Preamps  Built KT88 and EL34 stereo valve amps Built 300b Monoblocs Built 300b stereo valve amp with interstage transformer Built Cathode follower, Aikido and other valve pre amps Upgrade of top of range Ming Da pre including shunt pot and key signal path components Upgrade of 300b