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  • LA-150MII

LA-150MII

Signature Sound
Joule-Electra Information Library

Reproduced from old Joule-Electra Literature

 

JOULE ELECTRA
LINE STAGE AMPLIFIER
LA-150MII

General Description

The JOULE ELECTRA LA-150 line stage only pre-amp employs tubes throughout, including a tube reference and tube voltage regulator for each Stereo half. The overall gain is 11 dB and four inputs are provided as follows: CD, Aux-1, Aux-2 and Tape. The separate balance and volume controls can be operated by remote control and two outputs are available from separate output jacks. The input selector functions as a passive buffer which is unique in the industry and provides for complete separation of the tape recorder from the input circuitry when not in use.

Circuit Description

The LA-150 is a dual mono design with separate voltage regulators and power supplies for both halves of the stereo circuitry. The circuit is called a “Mu Follower” and is unique in that the cathode follower acts as a very high resistance buffer between the B+ and the plate of the gain stage. This is sometimes referred to as “totem pole” design. This allows the gain tube to see almost an infinite resistance at the plate, enhancing sonics and minimizing distortion. The Joule Electra LA-100 was the first commercial product using this unique circuit topology and the LA1150 follows in this tradition.

The circuit of the LA-150 is phase inverting. This design approach reduces the number of stages from three to two which has a very positive effect on the overall sonics. If you are concerned about system phasing and already have the preferred phase established, then it is only necessary to switch the hot and ground leads to both of your speakers if you have been using a non-inverting pre-amp.

The Mark II version of the LA-150 uses the work horse of the Joule line, the 6350, in both the gain and Mu Follower positions. This exceptional tube is NOS and no longer in production. We have several thousand of these on hand so availability will not be a problem. The power supply uses a zeiner diode as a voltage reference and a 6EM7 as a voltage regulator. In case you are interested, the schematic for this supply appears in the 1957 edition of the RCA tube manual. Completely independent regulation is provided for each channel and the only common ground for the LA-150 is found at the input terminals, as they are grounded to the chassis. Individually regulated filament supplies are provided for the gain stage and the Mu follower stage.

The astounding sonics of the LA-150 are not achieved by unique circuitry or clever design schemes. It is the result of using the simplest possible gain and follower stages and the use of parallel switch contacts in the input block. In addition to this, the sonic signature of every component in the signal circuit was evaluated and each of these parts was selected for maximum neutrality. The last and possibly the most important aspect of the design is the extremely large current capacity of the power supply. The circuit is so sonically revealing that changing almost any part including the wire will result in a detectable sonic affect.

Sonic Objectives

The LA-150 was designed with the following sonic objectives in mind

  1. Extended range from below 5 Hertz to above 100 Kilo Hertz +- 1 db.
  2. Clean open treble with no edge or glare.
  3. Enhanced sonic detail in the mid range, with full rich tonality and clean spacious harmonic structure.
  4. Solid extended lows with depth and authority.
  5. A broad, deep sound—stage, with proper placement of instruments both laterally and behind the plane of the speakers.
  6. Instruments occupy their own space, with good separation and vivid tonal accuracy.
  7. Ambience recovery maximized for the presence of the original performance.
  8. Provide both low impedance and very low impedance outputs for maximum sonic benefit.

We think you will agree with us that we have reached this goal

This historical information is provided courtesy Signature Sound.
We provide support, service and upgrades on Joule-Electra products.
Click here to go back to our main Joule-Electra resource and information page

Signature Sound

8409B Shallowcreek Rd
Liverpool, NY 13090 USA
Business Hours: Noon to 8PM EST
Demonstrations are by appointment

All prices listed on this website are subject to change without notice. We do endeavor to keep them current, but it is always best to contact us for the most current pricing.
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Signature Sound High-End Audio
1 week ago
Signature Sound High-End Audio

I have a special ONE TIME package deal here for folks looking for a great sounding turntable, cartridge, and phono preamp package. What's the catch? The deal IS ONLY AVAILABLE when you buy the specific Rega Planar 6 table, Hana SL low output moving coil cartridge, and Rega FONO MC phono preamp shown it the pics below. The package will come to you with free professional mounting and alignment of the Hana SL cartridge (along with Rega 2mm VTA spacer) on the Planar 6 so the table will pretty much ready to go when you get it. All items are brand new and come with full warranty. Total retail value of over $2,900 for HOW MUCH??? Unfortunately, I can not publish the price here . . . You will need to call, message, or e-mail me for our special price. ... See MoreSee Less

I have a special ONE TIME package deal here for folks looking for a great sounding turntable, cartridge, and phono preamp package. Whats the catch? The deal IS ONLY AVAILABLE when you buy the specific Rega Planar 6 table, Hana SL low output moving coil cartridge, and Rega FONO MC phono preamp shown it the pics below. The package will come to you with free professional mounting and alignment of the Hana SL cartridge (along with Rega 2mm VTA spacer) on the Planar 6 so the table will pretty much ready to go when you get it. All items are brand new and come with full warranty. Total retail value of over $2,900 for HOW MUCH??? Unfortunately, I can not publish the price here . . . You will need to call, message, or e-mail me for our special price.Image attachment
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How good is the Hana SL MC cartridge... here is just one of many very favorable reviews: www.analogplanet.com/content/hana-sl-mc-750-versus-ortofon-quintet-black-s-mc-999

Some more comments on the Hana SL from a Part-Time Audiophile review: "Completely lacking pretense, or subterfuge, this is a cartridge for honest music reproduction, and for those who honestly love music. It is incredibly quiet in the groove, so quiet in fact that at times when waiting for the first track to start I jumped up because I thought I hadn’t lowered the tonearm. While it may not have the cachet of a Benz Micro, or the safe sonic recognition of a Dynavector (both of which are brands I have tremendous respect for), at $750 USD it simply cannot be overlooked, ignored or unknown. It is a bargain of musicality at this price, with proper set-up, and in the right tonearm it will absolutely sing for years to come thanks to its long-wearing Shibata stylus, which should net an easy 2,000 hours of listening on clean, well cared for LPs. Highly recommend"

Signature Sound High-End Audio
1 week ago
Signature Sound High-End Audio

We have a range of used Audioquest Sky XLR interconnects available in several lengths. Around 15 years ago when these where new, they were one of the best (and pretty expensive) AQ interconnects. These used pairs are in very good condition and complete with Audioquests 72V DBS units. Prices range for the mid $400's for the shortest pair to around $700 for the longest. Please message, e-mail, or call for exact prices. Can ship these anywhere around the world. ... See MoreSee Less

We have a range of used Audioquest Sky XLR interconnects available in several lengths. Around 15 years ago when these where new, they were one of the best (and pretty expensive)  AQ interconnects. These used pairs are in very good condition and complete with Audioquests 72V DBS units. Prices range for the mid $400s for the shortest pair to around $700 for the longest. Please message, e-mail, or call for exact prices. Can ship these anywhere around the world.Image attachmentImage attachment+2Image attachment
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Me puede vender un par de 1.50 m me interesa oajala me pueda contactar le dejo nunero +52 5577686610 saludos

Signature Sound High-End Audio
1 month ago
Signature Sound High-End Audio

Some nice affordable used power conditioners have been traded in and are now for sale. The Isotek EVO3 SIRIUS power conditioner (these are made in the UK) is terrific for modest systems and this one is in excellent condition. Retail new, these are $700, this used Isotek power conditioner is a great deal for only $375 plus shipping (You will need to provide your own power cord or we can package a good affordable cord at extra cost with it - just ask us for recommendation/price). We also have a used PS Audio Duet power conditioner. These use a simple, but effective filter - great for subs or amps etc. Yours for only $125 plus ship! ... See MoreSee Less

Some nice affordable used power conditioners have been traded in and are now for sale. The Isotek EVO3 SIRIUS power conditioner (these are made in the UK) is terrific for modest systems and this one is in excellent condition. Retail new, these are $700, this used Isotek power conditioner is a great deal for only $375 plus shipping (You will need to provide your own power cord or we can package a good affordable cord at extra cost with it - just ask us for recommendation/price). We also have a used PS Audio Duet power conditioner.  These use a simple, but effective filter - great for subs or amps etc. Yours for only $125 plus ship!Image attachmentImage attachment
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Signature Sound High-End Audio
1 month ago
Signature Sound High-End Audio

I know I have a number of big LP listeners out there, so this used item is for you! British made Loricraft PRC4 Deluxe Record Cleaning Machine. The unit (which I believe is about 10 years old) is in proper working order and complete with all accessories and a bunch of extras (several LP brushes, Disc Doctor record cleaning pads, Milty Zerostat 3, L'art du Sound record cleaning fluid, PLUS spare roll of thread, spare hoses, and a spare belt!). These units are actually quite quiet too compared to most other RCMs. A complete record cleaning package, all yours for $1,500 plus shipping. ... See MoreSee Less

I know I have a number of big LP listeners out there, so this used item is for you! British made Loricraft PRC4 Deluxe Record Cleaning Machine. The unit (which I believe is about 10 years old) is in proper working order and complete with all accessories and a bunch of extras (several LP brushes, Disc Doctor record cleaning pads, Milty Zerostat 3, Lart du Sound record cleaning fluid, PLUS spare roll of thread, spare hoses, and a spare belt!). These units are actually quite quiet too compared to most other RCMs. A complete record cleaning package, all  yours for $1,500 plus shipping.Image attachmentImage attachment+1Image attachment
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A vid from Micheal Fremer on the Loricraft: youtu.be/i10aywMj-7U

Another vid from the Orgin Live folks (well known in the UK for their modded Rega tonearms and other stuff) in the Uk on the Loricraft: youtu.be/76JgIhE5eQ8

I built a similar record cleaning machine. Diaphragm vacuum pumps and localized cleaning across the surface really does a good job at deep cleaning and saves your hearing.

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