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Lux91 Monoblocks - Our Best Ever

We have playing in house a monoblock version of the Lux91.

The original Lux was Thorsten Loesch's circuit and excelled in drive and dynamics, putting out 12w on musical peaks.
The key feature was the reactive interstage - a 5687 with choke on the cathode and direct coupled to the grid of the 300b. The role of the reactive interstage is best understood by viewing the 5687, choke and direct coupling as a unit.

Thorsten has been at it again and we've been tweeking the implementation these few months. These are:

1. 310a used as driver tube: This tube just has such a luscious tone -- it's too good not to have.
2. Monoblock chassis: needed as the extra parts would be too much to fit into a single stereo chassis
3. FCUPS power supply: Big L, small c gives even more 'kick' when needed, and all film caps as should be the standard for any highend products to be taken seriously
4. Fixed Bias: The Active Bias Supply (ABS) module is used to provide bias on the grid as supplied by the FCUPS. This allows the cathode of the 300B to have only a single small extreme high quality resistor -- NO CAP!
5. Choke input power supply: together with 5U4. nothing more need be said!
6. Of course our VCS filament supplies round out the module complement for lowest noise - best sound.

result?
dynamic range of 100dbA
0.3-0.4mv output noise

16w from a single 300B!

No sacrifices! You should hear these driving our Tutti horn ribbon speaker system. If you pass by HK, drop in for an audition.

Hmmm.... how about 300B+ implementation? An 845 slayer?
Stay tuned.

more....
DIY - Done Right!

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Topic - Lux91 Monoblocks - Our Best Ever - bcherry 17:58:05 03/02/10 (6)
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