Description
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The Joule Electra LA-150 MK l Line Stage Pre-Amplifier.
230 volt 50/60Hz (European Model)
I'm using a step down transformer for this preamp on my system without any issue.
I spoke with Jud Barber and he told me that if I sent in for an upgrade to a JE LA-150MK ll for $500 and he'll upgrade the power supply to 110 volt 50 Hz for free.
Joule Electra, committed to all-tube based designs, is praised the world over for high quality, extremely musical products, exemplary craftsmanship, and a commitment to bringing musical
realism to the home.
Based on the widely acclaimed LA-100, and the result of many significant developments, it retains
all the virtues of the 100, but increases sonic and musical performance throughout the audio
spectrum. "The LA-150 employs our mu-follower circuitry and a pair of extraordinary new Russian
military wonder tubes, the 6C45-P", enthuses Jud Barber, president and designer of Joule Electra
products.
"Each tube is a single triode rather than the more typical dual-triodes found in most high-gain
tubes. In fact, the 6C45-P has the gain and power of fifteen 12AX7's in parallel and works
extremely well with the new 6H30-P we use as a mu-follower. With only a single triode in the
signal path, it’s the simplest and most elegant circuit for a tube amplifier. One 6C45-P and 6H30-
P are used in each channel of our dual-mono LA-150 preamplifier."
The LA-150 also benefits from a number of audiophile build qualities including:
A. All-tube power supply located on a separate board than the signal-carrying board. The
larger power supply board uses broad copper traces to connect the major components, while
some heavy current connections are connected with separate insulated conductors. The smaller
signal board has no traces; it's all done with point-to-point wiring. Each connection point is
anchored by a large copper pad where all leads are sealed together with silver-bearing solder, a
technique unique to Joule Electra.
B• Pure DC supply implemented with two batteries under the signal boards! (And yes, the batteries are included.). They're part of the Adjustable Bias Circuit and insure that pure DC exists
on the signal grids of the gain stage, yielding clear, open treble; rich, full upper midrange; warm
balanced lower midrange; and a solid deep bass presentation. Another feature unique-to-Joule
Electra.
C• High energy storage with > 150,000 microfarads of energy storage used in the two
regulated filament power supplies and two separate tube regulated B+ supplies.
D• Stereo/mono switch. To prevent it from causing crosstalk between channels, there's a
triple pole switch with its center contacts grounded, resulting in channel crosstalk of only -80db.
E• Maximum channel separation insured by a brass shaft connecting the selector switch to
the front panel. With multiple decks and wide spacing, it shortens signal inputs and reduces
crosstalk even further. The multiple decks also allow paralleling the contacts which reduces the
lack of transparency caused by the single-contact designs found on most preamps. All switching
functions are accomplished with this one device. A tape monitor loop is available between each
of the selector points eliminating the need for another switch. Each input is virtually direct.
F• Resonance control mounts the signal board on an exotic tri-flex suspension system
isolating it from vibrations and feedback. State of the art materials are used, such as EAR vibration
bushings and ISO-DAMP sheets. "Where have you seen this before?" asks Jud Barber. "Probably nowhere!"
G• Shunt-to-Ground Input Block using custom pots made to our own specifications. The
volume/balance system is completely passive functioning completely outside the signal path. The
signal passes through two high quality resistors then directly to the input tube grid.
H• All-tube design using the Russian military 6C45-P in the gain and 6H30-P tube on the mu-follower circuit, a
6EM7 regulator tube, and an 0A2 voltage reference tube.
I• Premium quality parts like Holco, MIT, Puriest Audio and Cardas jacks and wire.
J• Maximizes output impedance loads for long or short cable runs by using the 400 ohm
signal from the output stage, or 50 ohms directly from the mu-follower circuit to drive some solid-
state amplifiers.
Please, no tire kickers. Low ballers will be ignored
Price is fair and firm.
Buyer pays actual shipping cost.
All Prices are in Canadian Dollars
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