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Rogers A75 Integraded Amp.

 
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tancrède
Intermediate Contributor 25+


Joined: 12 May 2004
Posts: 34
Location: Quebec Canada

PostPosted: Sat May 22, 2004 11:03 pm    Post subject: Rogers A75 Integraded Amp. Reply with quote

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Hi

Do you know something about Rogers A75 MKII Integraded Amp. ?

It's look like a very good one, but i did not find some informations on the Web, so ???


Thanks


Serge
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David
Intermediate Contributor 75+


Joined: 11 Jun 2003
Posts: 90
Location: Canada

PostPosted: Thu Jun 10, 2004 8:11 pm    Post subject: Reply with quote

Hi, I am in Canada too. I have seen one for sale for a long time and met the seller on another deal. I was trying to find out some information myself on it.

It was made in the 70s and was matched for the LS3/5a. Some of the posters on the LS3/5a yahoo group use it. I don't know any more than this. There doesn't appear to be a lot around.

What were you planning on using it with.

David
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tancrède
Intermediate Contributor 25+


Joined: 12 May 2004
Posts: 34
Location: Quebec Canada

PostPosted: Thu Jun 10, 2004 8:30 pm    Post subject: Reply with quote

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Well, i was only searching for a good amp. class AB

This Rogers amp. most be hard to repare. Parts are no longer disponible.

I like lesson to music with my old Ariston turntable, and speakers Kef 304 or B&W 330i.

I like the low bass. Unfortunately, Bristish system audio usually dont like to go in low bass. Celestion Ditton 66 is a exception.

Of course, i know that good low bass is hard to obtain.

A good subwoofer seem to be a good solution.


Serge
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David
Intermediate Contributor 75+


Joined: 11 Jun 2003
Posts: 90
Location: Canada

PostPosted: Thu Jun 10, 2004 8:59 pm    Post subject: Reply with quote

Serge, there are a lot of good AB amps around that I would choose before the Rogers. There are a lot of British integrateds from the 80s that work quite well with Kef and other speakers. I have a Naim integrated and a Musical Fidelity from that period and they sound great. Lots of bass, great imaging and detail. I had a Cambridge P35 that died and I haven't got around to getting it fixed. Sounded great, but reliability was a major issue with them. Rotel would be another possibility for you. Other names that come to mind, Creek, Cyrus, Sugden, the list goes on....

My 104abs have lots of bass as a lot of the kef speakers. I have not considered a sub would be necessary at all. I am sure the other posters would agree that the old kefs have a lot of bass. The B110 units in my Kans give remarkable bass for their size. I have heard the Celestions and really was not that impressed, by the bass or anything else. I am bracing myself for the flames.

David
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tancrède
Intermediate Contributor 25+


Joined: 12 May 2004
Posts: 34
Location: Quebec Canada

PostPosted: Fri Jun 11, 2004 7:36 am    Post subject: Reply with quote

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Hi David

I think that we dont have the same definition concerning bass.

My Kef 304 and B&W 330i never sound like the B&W 802 or 801.

I think that Kef 105 with the 12 inches woofer most have low bass.

Low bass, mean that they can reproduce at least 25 or 30 hz from the fondamental and not harmonics reproduction.

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I agree that sometime, old amp. was better than the new (esoteric) amp. of today.

Audio is very esoteric since a few years. Good old speakers where polyvalent.
New speakers are specific for a style a music, but they are no more polyvalent for many kinds of music.
My opinion is that a good speakers can play well every kind of music.
And good speakers are simple. Good speakers, good simple crossover, and a good and solid wood box.

Some people beleive that change the power cord with one who cost 200$ or more make the amp. sound better.

How can a amp. sound better with a power cord who cost 500$ if the electric wires inside the wall are cheap, i mean normal 14/2 or 14/3 from the principal derivation panel electrical ???

And how can a power supply; diodes bridge, transfo(s), capacitors filtration, and sometime a regulator or transistors, can sound better with a 500$ power cord ???

This is a mix of esoteric, imagination, and mystery believes.

According to experts in audio and biomedical, a human ear cant make the difference between 0.02% - 0.04% distorsion. So if the amp. indicate 0.005% distorsion, nobody can ear this accuracy.
Almost same thing with frequency. Earing is very personnel and very subjective.


Serge
Electrotechnicien(general and telecommunication), Electro-biomedical(specialist), and electrical house and industrial.
New job, piano tuner since a few years.
Audio where not my specialty, but i know everything about sound and frequency, wave, fondamental and harmonic, etc...
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David
Intermediate Contributor 75+


Joined: 11 Jun 2003
Posts: 90
Location: Canada

PostPosted: Fri Jun 11, 2004 2:53 pm    Post subject: Reply with quote

Serge you are probably right about the definition. I went to a concert this week and was surprised, or disappointed at:

1/ The amplification on the kick drum--Changed the sound entirely to some mega thump- no definition no pitch, no tone.

2/ The bass guitar. I swear the guy must have been using a pitch changer to drop everything down an octave. Didn't hear any discernable pitch or attack on the strings.

Lots of low bass at the concert, but quality????


What I am getting at is what instruments are actually reproducing sounds at 25-30 Hz. I think a pipe organ goes down to 32 Hz for the fundamental. The lowest E on a double bass is probably around the mid 40 hz level.

Distortion? I don't know if anybody can distinguish distortion levels to the hundredth, probably not to a 10th of one per cent.

Old Tube equipment has much higher distortion than solid state, but sounds better to some.

Human perception being what it is, just means that each of us may have different ideas of what type of sound we like. Just look and see how much money the local Future Shop and Best Buy are making. Would you buy audio there? I don't think so.

David
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proffski
Über Contributor 1000+


Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Tue Aug 30, 2005 1:18 pm    Post subject: Reply with quote

I would not go for the Rogers.

I did repair one about ten years ago for a friends father.
It was well past its use by date.
The main power supply capacitors were dry and had leaked.
Most of the coupling capacitors needed replacing.
It may well have been a fine amplifier in its day, but unless you are willing to spend time and money on it I'd say do not do it!

There is plenty of Naim stuff around at sensible prices.
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