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The story is simple. The routine with this amp was to turn it on, wait 15 minutes, adjust the bias on 16 tubes, then play music.
The Amplifier had blown several tubes with subsequent damage and in the process of a thorough overhaul and repair we fitted the ABS. The 1R resistors in CAT cathode circuits were changed for 10 ohm and the Meter was re-adjusted to read correctly. This done, the usual ABS behavior cuts in, the bias is ramped up slowly and stays rock-steady afterwards, with no mismatch between halves.
Now all that is needed is to switch it on and within a few minutes all bias voltages settle and good sound is heard from the get-go.
Our universe became a little disordered last year when we introduced the single chassis LD dual mono. Due to escalating costs the 8 year old LD monoblock was not sustainable as a product on two counts: 1. cost of materials and manufacturing had almost tripled since the original Billie was offered for $700 (including all the upgrades we progressively built into the kit) and 2. shipping overseas by Fedex had doubled from <$200USD originally to >$400USD by 2009 (also due to the extra weight of all the upgrades and enhancements).read more »
power supply: we know that fast recovery and energy storage are prime ingredients for a good sounding power supply; unfortunately the two qualities seem to be mutually exclusive. Add tons of capacitance and you get energy storage BUT very slow recovery and sluggish sound. If we go with small film caps we get very fast recovery but with just a few successive transients and we quickly run out of steam . Depending on priorities different paths are taken. In Asia it is very common to see power supplies with 10 micro farad film capacitors in the pi filter with their characteristic sound. in the West is common to see huge electrolytics or banks of oil caps, 200+ micro farad per leg.read more »