Hartley

Music Fidelity A 1 Amplifier

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Hi,

I have just joined this forum and I am sure that the question i am about to ask has already been asked somewhere deep in this forum space.

I have a rather nice and warm sound Music Fidelity 1980s amp and I really enjoy the sound. I am now looking for a good pair of matching speakers to fill my room with sound.

The current speakers distort when played at a high level so I am on the look out for a good match for the amp. The roof that they will be in is quite large so the speakers do not have to be bookshelf size unless they are ideal. I prefer to buy second hand up to about £800.

Thanks

Mark

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Moderator

Mark, welcome to the Wam. Please update your profile, especially with your current speakers. Your location will also help, as some local Wammers might be able to point you in the right direction.

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I have a b1 lurking about somewhere..speaker distortion at high level?  Depends on volume?  most speakers give up the ghost at some point.. Have a look at dynaudio..you wont go far wrong

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The A1 was only about 25wpc iirc so if you’re to avoid distortion at high volume you need to choose a very efficient pair of speakers, preferably 90db/watt or higher, your amp should be able to produce decent volume level unless you’re listening in a very large room. That should be the case unless some internal components in the amp have gone out of spec over time which can happen particularly as the A1 runs up to quite a level in Class A and hence runs hot, a lot of the early ones were unreliable because of this, if you really want to stick with it might be an idea to take it to a specialist and have it checked over and have any remedial work done on it although it might not be cost effective. A relatively modest priced modern amp would outperform the A1 easily and give you a greater choice of speakers. Something like an Onkyo A-9010 at around £200 could definitely suit the bill, 44wpc of clean power and a decent MM phono stage if you’re into vinyl.

If you really want to stick to the A1 a pair of Q Acoustics 3050i floorstanders which are 92db/w should give more than enough volume even in a large room, they’re well within your budget.

Sent from my iPhone using Tapatalk

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Super Wammer
48 minutes ago, Steve Z said:

The A1 was only about 25wpc iirc so if you’re to avoid distortion at high volume you need to choose a very efficient pair of speakers, preferably 90db/watt or higher, your amp should be able to produce decent volume level unless you’re listening in a very large room. That should be the case unless some internal components in the amp have gone out of spec over time which can happen particularly as the A1 runs up to quite a level in Class A and hence runs hot, a lot of the early ones were unreliable because of this, if you really want to stick with it might be an idea to take it to a specialist and have it checked over and have any remedial work done on it although it might not be cost effective. A relatively modest priced modern amp would outperform the A1 easily and give you a greater choice of speakers. Something like an Onkyo A-9010 at around £200 could definitely suit the bill, 44wpc of clean power and a decent MM phono stage if you’re into vinyl.

If you really want to stick to the A1 a pair of Q Acoustics 3050i floorstanders which are 92db/w should give more than enough volume even in a large room, they’re well within your budget.

Sent from my iPhone using Tapatalk

What he said - also look at Klipsch and if you like that smooth articulated sound if your budget stretches to it a pair of Tanny 3LZ (10 inch monitor golds) or Tannoy 15 inch monitor golds (lancaster and others) would sing on the end of the A1.  

Basically look at loudspeakers with 89db for 1 watt at 1 meter or greater, to be able to listen at high volume levels.

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Posted (edited)

I used a pair of LV auditoriums on a MF A1 while my otto se was being served years ago. Sounded really good and older pairs can be had for less than 800.

Edited by lee1975

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Super Wammer

An old friend has had that amp for years and loves it. He had a service and it sounded much better afterwards so worth bearing in mind if not already done as they sound becomes a little clearer. 

As well as high efficiency speakers also think about easy to drive speakers with lower impedance like Harbeth and Proac. 

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I used to have the more powerful A100 with EPOS ES14 speakers, really a nice sound.

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Posted (edited)

I have an MF A1, it is 20 watts into 8 Ohms Class A, runs hot DO NOT put anything on top unless it is fresh bread and you want toast :)

I have used it to drive a pair of 1995 Castle Howards which are 92dB 1w/1m, did a great job with plenty of volume.

It  is now in my wife's workshop which is approx 70m2, source is a SB touch and it is driving a pair of Usher S520 standmounts, these are 86dB sensitivity.

They are also reputed  to be not an easy load. A1 drives them no dramas, not sure if it is due to the output level of the SBT, or being close to a corner, but SPL is pretty high.

QA wasn't too good at one point in the production and insufficient thermal paste resulted in over-heating problems. Just something to be aware of.

Edited by Batty

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Super Wammer
Posted (edited)

Welcome, Mark!   

Unless it has always done this, I’d suspect the amplifier is going adrift, as suggested above.  Until you’re sure it is 100% I’d forget buying different speakers for the moment.  And if you’ve heard distortion for a while, the speakers may have been damaged.  What speakers are you currently using?

Edited by Nopiano

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Super Wammer

If you keep the A1 I'd set up a fan ( computer one maybe running at half speed) to blow air across the top plate to eliminate any overheating issues - doesn't need much air movement to break down the hot boundary layer close to the surface of the heat sink and it will run cooler/smoother/live longer.

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Super Wammer

It would help if we knew what the current speakers are. The distortion could be the amp clipping at higher volumes, especially if the speakers are hard to drive. The speakers could be damaged, voice coil damage,  from playing too loud, regularly. 

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Posted (edited)

If the amp is clipping at close to full output the volume level with average efficiency (87db/w) speakers  the sound level at a 3m listening distance would be in the region of 95dbs this is getting close to disco levels, I’m guessing the distortion is coming in at a considerably lower level, if that’s the case then it’s probably due to one or more of the internal components of the A1 has gone way out of kilter, first course of action would be to get the amp serviced by a specialist. I’m guessing the distortion is coming in at a level of just a few watts, about 18 months ago I was driving my slightly below average sensitivity 85db Q Acoustics Concept 20s with an Amptastic Mini 1 Tripath amp which is only about 12wpc, the amp was capable of driving the speakers to neighbour disturbing levels with no distress with the volume knob only halfway up. Definitely hang fire on getting new speakers until you’ve got the amp checked.

Edited by Steve Z
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