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LUX Signature stereo amplifier
How to drive a DHT power triode
choice #1: pentode. offers necessary single stage gain but high output Z. tendency for highs/lows to be bandwidth limited. Clipping: not nice. Sound is delicate, immediate and pleasant 'bouquet of tone'. Fast! and retrieves the finest details as it sweeps the sonic landscape. Can swing the necessary voltage but but don't ask it to lift heavy objects. the DHT needs more muscle.
choice #2: triode. gain-challenged, needs more than one stage. (Hi gain versions sound like solid state). Low output impedance, wide bandwidth, great slam and dynamics. can be used with a grid choke for greater perceived power. Muscular, but lacks the refinement and delicacy of the best pentodes; leaves behind some of the fine details.
choice #3: re-active interstage. pentode on the input. paralleled sections of a triode with a choke loaded cathode. direct couple to the grid of the DHT.
the DHT gets what it likes: lots of swinging volts and iron fist control, even when driving the grid positve. This is Lux.
the pentode does what it does best: gives tons of voltage gain driving the undemanding load of the re-active tube interstage. The interstage is loaded only with the following grid and cathode choke so bandwidth approaches DC to light and is sonically neutral, no cap coupling to the DHT. The DHT thinks the choke of the interstage is it's very own grid choke. And we still have our pentode!
add to this: dual 5AR4 tube rectification (tubes=tone), dual mono HT AND PS film caps for extra speed, lifting of the veil, no ecap smog
more: WE connection on the 300B for more quiet, more dynamics
Result: tone and refinement of a pentode married with the slam and dynamics of a triode - something like a ballet performed by Superman and Karen Kain?
Lux:
stereo amplifier, dual mono choke loaded power supply AND film caps on the B+ rail to the power tube anode.
2 x 5AR4 tube rectifiers
2 x EF86 pentode input tubes. Roll tubes at this position first. E80F gold pins and 6267 can also be used.
2 x 5687/cathode choke re-active direct coupled interstage
2 x 300B Direct Heat Triode
rich in iron; 2 output transformers, 1 power transformer, 2 power supply chokes, 2 re-active interstage chokes.
Note re 4/8/16ohm speaker taps: Why? It is needed. Really. Nominal impedance ratings are often misleading. An 8 ohm rated speaker may be 6 or 12 ohms and often sounds better on 4 or 16 ohm taps. Always try different taps to determine which gives best sound. When the right tap is selected, soundstage will be bigger and sounds more energetic. Also 16 ohm taps allow using vintage high efficiency speakers. Connecting them to 8 ohms is a compromise.
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Lux One: Lux 300B SET Power Amplifier Basic Kit::
Stereo chassis. (No tubes as standard). Manual, parts and hardware complete for standard Lux 300B. Basic standard parts included are not junk parts but typical of what you'd find in assembled high end retail product selling for 3X the cost. But the price is low so you can enjoy now and upgrade later
Lux Two+: Lux 300B SET Power Amplifier Premium Kit:
Stereo chassis. (No tubes as standard). Manual, parts and hardware complete for premium 300B. Premium parts package: Optimized Kiwame resistors, copper/teflon hookup wire, Obbligato coupling caps, Obbligato cathode cap, cathode wire wound resistor, teflon tube sockets, copper speaker binding posts, silver plated RCA, WE connection Obbligato caps, Oil cap and Blackgate caps on the driver anodes and cathode - in other words - maxxed out with all the expensive bits you'd never find in high end off the shelf up to 4X the price.
This is no compromise max-pak. The only other option applicable to this package would be your choice of 300Bs and DIYHFS filament modules.
Lux Three+: Lux 300B SET Power Amplifier Premium Kit:
As per Level 2 but adds: Pure copper gilded RCA and speaker binding posts. Optimized Tantalum/resistors, silver wire, teflon/tinfoil coupling caps, Blackgate N-type on 5687 anode. No polarized caps anywhere on the B+ rail.
This is no compromise max-pak. The only other option applicable to this package would be your choice of 300Bs and DIYHFS filament modules.
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Option 1: Basic tube set: 2 x EF86/6*32 + 2 x 5687 driver tubes and 2 x 5AR4 rectifier tubes. (for Lux one and two)
Option 2: Basic tube set: 2 x EF86/6*32 + 2 x 5687 driver tubes and 2 x 5AR4 rectifier tubes, 2 x STF OEM 300B. This will get up and running with a very respectable, reliable sound. (for Lux one and two)
Option 3: Power Tubes (2 x Full Music mesh plate 300B Gold). Premium grade tubes with gold pins. Globe shaped glass, ceramic base. 5V heater. Matched pair.
Option 7: The LD+ has the voltage supply to drive the DIYhifi filament heater supplies. This will make hum levels in the .2 to .5mv range possible. DC heating without draining the life from the music
(this special price only in combination with an amplifier kit)
Option 8: Fully Assembled :
Kit is professionally assembled and tested including any of the options above or below. You receive a complete ready to use product out of the box.
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