Lets introduce me and my system to you. I'm Andy and I'm a vinyl classical music freak. Now that's enough said about me so now to the system.
The Record DeckI struggled for some years with a record deck atop a stand. Even good stands are poor when placed on suspended wooden floors, which are common in older houses in the UK. When we decided to extend the house the second priority (the first was the kitchen for the wife) was to have the music room extended and a concrete floor in the extended part. This was a great decision! A large sand box using dry silver sand (it does not clump nor encourage growth of plants), 130kg in all, was used as the base for the record deck. Atop this is a sandwich of two layers of slate epoxyed together (originally I had used chip board but slate sounds better) - then four Newport Systems air suspension pucks - then another smaller sand tray then the Michell Gyro deck. I guess by now you can tell I'm a bit over the top, but more of that to come! My stand can withstand a fair sized kick without any noticeable sound coming from the speakers and I regard this as a "key test".
The deck is fitted with a DC motor, rather than the standard AC one. An SME arm and a Clear Audio Gamma cartridge finish the vinyl front end. The DC supply for the Gyro motor comes from a rechargeable battery followed by two voltage regulator stages. Oddly enough, it is important to have two voltage regulator stages. I used a 7809 and an LM317. A small adjustable pot is available for speed adjustment but, to be honest, I don't tweak it more than once a year.
Circuitry is actually simple, 6 separate HT regulators based on a no feedback design, 6 HT buffers, 12 heater regulators again using no feedback technology. Huge numbers of FKP1 caps - about 250 in the pre-amp box!Glass Audio, Volume 1, Number 5, 1993. Recently, they have been rebuilt with a few mods, most of which have also been in GA. Once again, large and heavy construction.
The SpeakersThe speakers are ESL63s supported on big stands 18" off the floor. Not the greatest speakers, but I don't know of anything I could live with and maintain a comfortable relationship with my neighbours.