Sunday, May 2, 2021
Sunday, March 7, 2021
Initially I was asked to make an amp to work with some speakers. It turned out I made a whole system for the customer;- tube preamp, 300/500W SS amp, Xover and speakers. Boxes were supplied along with woofers (polycones) I recommended. Boxes are 170ltr, Dacron lined. The woofers are 95db efficient and the Faital compression drivers 109. I had to pad down the horns (Altec 511B) 14db. Xover at 1100hz and 3rd order on the horns and 2nd on the woofer. Owner to paint boxes.
The sound is a little forward but pleasantly so and the woofers are flat to 30Hz. Fs for this inexpensive efficient woofer is 25Hz. Bass is tight but with the speakers closer to the wall bass will lift a bit and sound even fuller. Very transparent sound driven by the Holton based amp.
Sunday, February 28, 2021
"La Ruse" as the name suggest is hiding something. Its under the paint work and similar to "Illusion", its chassis is a plastic jiffy box. This time spray with Ocean Blue hammertone. Mach that with a large gold knob, looks the part. The tubes I've had for years and are Genelex Gold Lions ECC83 gold pin (similar to 12AX7) which have high gain. About time I finally put these premium tubes to work.
All resistors are 1/4W carbon. I like carbon because it appears to produce great musical flow and combined with the high gain tubes produces a big bold sound. No cost cutting with the attenuator which is my favorite Alps Blue velvet and it is on the output. With the pot on the output you are not throwing away precious raw signal by attenuating the input then trying to amplify what remains producing more noise.
Once more Russian Military paper-in-oil caps are on the output, they always sound good. There are two inputs selected by the small switch at the front. The external PS produces 12V regulated and 250VHT electronically smoothed. All hookup wire in the audio path is silver plated fine copper wire. There is no PCB. Wiring is a combination of component-2-component and point-2-point. The preamp is dead quiet. La Ruse not only looks good but sounds great and very grounded.
Friday, February 5, 2021
Thursday, January 28, 2021
Friday, January 15, 2021
Saturday, December 26, 2020
Another quality tube MM phono kit from Greek Radi0kit. This time in a Hammond wood cheek chassis and sprayed Indian Red. Also from Radi0kit the PS kit which employs regulated 12V for the filaments and electronically smoothed HT of better than 250V depending on load.
As with all these kits they sound excellent with the standard JJ 12AX7S tubes. Parts are quality;- ceramic sockets, Visheys, Dale, Nichicon and Cornell Dunbilier. Mantra is dead quiet, looks smart and sounds really great. Happy with the build.