Diva Audio M7 Preamp - Latest update
For all you Diva Audio M7 users out there, T.S. Lim has just revised his flagship M7 preamp. The latest revision combines two stages of modifications. The first stage involves new voltage supply filtering on both the B+ and the heater, combined with star ground wiring arrangement. The second stage is a rewiring of the tube arrangement to allow easier tube rolling, and the installation of a new internal bracket that allows higher quality smoothing capacitors to be installed. More on the tube rolling - previously the tube stages in the M7 are arranged as follows, the bottom tube uses one triode (the 12ax7 is a dual triode) as first stage, and the other triode as the second stage of the left channel. The top tube is identical and is used for the right channel. This then passes through the third stage in the middle tube (one triode for each channel). This means that you can only roll two different type of tubes at the most since the first and second stage use the same tube. The M7 is now w...