Classified ads in Leak Electronics & Technology - Electronics & Technology
Below you will found our manuals on the Leak Stereo 30 Plus. Brochures often advertise certain specifications, the release date and the original price. Hi All, Just a quick blog to say that we now have the new Audio Research M Valve Mono Blocks now on Permanent demo and I have to say. The original Leak Stereo 30 is one such example. The styling was brought up to date, allowing the unit to be free-standing or cabinet-mounted. with small rotaries for the tone controls, plus a row of press buttons for source.
Moving coil was not a major concern in This beingall options for adjusting recording characteristics have been consigned to history and the response is within 0. A built-in rumble filter cuts in steeply at 30Hz.
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Gordon Hill remarked that, 'Those who were around at the time will recollect what a blessing that was. Customer loyalty was a huge part of the Quad client profile; to prevent culture shock for users moving to the 33 from the 22, Quad provided an extensive filtering and tone control system, with small rotaries for the tone controls, plus a row of press buttons for source select and filter settings. Gordon Hill felt that it was, 'Outstanding in partnership with the 16ohm ESL; the amplifier's performance features low distortion and a controlled bandwidth of 20HzkHz, -1dB.
As transistor amplifiers go, the output impedance is a relatively high 0. At very low impedances, performance falls off. Gordon Hill remains impressed with the The genius of the circuit lies in the innovative use of "output triples", which renders the current in the output stage virtually immune from temperature changes and ensures stable performance under widely varying conditions.
I found it so easy on the ears that, most of the time, I was simply unaware of its presence - high praise, I assure you. Clean, sweet, devoid of the nastiness of most early tranny amps - it stood out amongst its contemporaries as a harbinger of doom for the commercial dominance of the valve. Gordon Hill felt that, 'Certainly with 16 ohm loads, the amplifier behaves impeccably.
On loads where the impedance plunges heavily at low frequencies, the amplifier can run out of steam and its 4 ohm performance is just about adequate. That said, there are thousands in current use all over the world and, in its day, the was extensively employed in domestic, broadcasting and professional applications, satisfied users including improbably Pink Floyd. This year, Quad relaunched a facsimile of the Quad II valve amp. Unlikely, and for two reasons. I was once told - emphatically - that both pieces would be too expensive to produce today, using the methods and technology of their day.
And the other reason? The survival rates of both the 33 and the are so high that, at any given time, the classifieds and the audio fairs are full of them, at bargain prices. And, yes, Quad will still repair them.
As for the disproportionate number of 33 vs sales, Quad accounts for that by reminding us that the arrival of the power amplifier preceded the arrival of a matching pre-amp - the 44 - by four years, so a number of s were sold with 33s.
Stereo 30 Plus
The review contained the following comments: It has been represented in our country before, but has never really become very well known. Recently, the very active firm Naho, has taken up this English name which reminds us more of trumpeters than amplifiers. We hope with success, because the first representative, the2 x 25 watt amplifier has left a very good impression. The steep sides and limited rounding off, even at 10 kHz, confirmed the sound quality which had already indicated a very praise reproduction of low and high frequencies.
One can call the stability excellent. Maximum power into an unloaded output had no other effect than that the square wave at 10 kHz rounded off a little more with no ringing apparent. This is an amplifier which we find suitable for electrostatic loudspeakers.
The reviewer continues with: The understatement of the specification and the simple appearance are very nice. The very practically designed and steep working filters and the evident stability are extra attractions.
Sales of the range were already fairly healthy by this point.
But the effect of this publication was to lift the demand for Armstrong equipment though the roof! It was produced by an independent body called the Consumer Association CA. Member of the public interested in consumer goods could join the CA, and in return would get the magazine. Its approach to reviews was different to most commercial magazines. Usually, a magazine would request items for review direct from the manufacturer. This was to ensure they did not get equipment that might have been given special treatment by the maker.
The magazine then presented the results in terms designed to be understandable by a general audience with no previous knowledge or expertise.
The emphasis was on a explanation of the then novel for a mass-market! However a few specific comments were made. For example the CA had sent out questionnaires to its members and analysed just under 1, responses on stereo equipment. This led to a mention that: This was aided by the plug-in cards used for the electronics in the and previous range. Most faults or problems could be dealt with quickly by simply removing a faulty board and plugging in a working replacement.
Armstrong retailers were happy to accept sets to send back for repair.
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But customers who could get to Holloway in London soon realised that if they had a problem with a range set they could bring it to the factory and it was often repairable whilst they went and had a cup of tea! One result of this was that those who worked at Armstrong became used to customers walking down the road and into the factory, carrying their precious item.
On that topic the review said: The Quad had a wide range of adjustments for different equipment and different source material — but you pay a lot more for this. We think the Leak better value for most people.
Of these the Ravens- brook was the least powerful, and didn't have a headphone socket; and the Cambridge was considerably more expensive. Copies would also have gone to many public libraries, and its content tended to be picked up by newspapers and broadcasting. So what was said in the survey would have reached a far wider audience than a review in a specialist magazine for Hi Fi enthusiasts. The rapid rise in demand for the coincided with a change that was happening in the consumer goods retail market.
They usually offered a personal service advising and helping customers, and were often technically skilled as well as being audio enthusiasts themself.
However by a totally different approach to retail was growing rapidly. These warehouses simply sold units in unopened boxes on the basis of offering a low price. It was assumed that the buyer preferred the lower price in exchange for having to make their own choices and be able to put together the items they bought into a stereo system.
At one point they were trying to order more sets than Armstrong could actually make. They were doing this because they realised that their customers tended come and to buy a system of associated items. The customers saw the low price for the and came to the warehouse. Having chosen the they then wanted loudspeakers, a record deck, etc.
Since they were now in the retail warehouse they bought these other items there during the same visit. But back then it was perfectly legal and regarded as acceptable. Alas, this presented a dilemma for Armstrong. It was great to be selling so many units, but they realised that if they agreed it might well kill off the many small specialist retailers. The result might then become a quasi-monopoly retailer.
Consumers would lack choice and Armstrong would only have one dominating retailer who could virtually dictate terms.
So they decided to continue to supply their franchised dealers and sell the rest of what they could make to the warehouses. The tuner was the subject of a report in October However, one or two modifications have since been made to the and included in Model One modification is the use of silicon transistors for the driver modules of the power output stages, resulting in slightly lower distortion. The is supplied in a neat wood case but can be mounted in a larger cabinet.
However the above is interesting for the comment made on the driver transistors. The continued to use Germanium AL transistors in the output stage of its power amplifiers. This meant that they tended to tweak or improve the circuity in their units to improve performance or reliability.