View Full Version : FS: EWA M-50 Power Amplifier
ijrussell
24-05-2020, 13:59
Mint condition EWA M-50 power amplifier (3/4 width case). One of the latest designs by Colin Wonfor. 50 watts/channel into 8 ohms and 100 into 4 ohms. Minimalist design with single pair of RCA inputs and a pair of multi-way binding posts for the speakers on the rear and an on/off toggle switch on the front. The case is a pre-production model but the internals are full production spec. Purchased in August 2018 and has had less than 200 hours use. I have the non-branded box it came in. Comes with 1.5m captive mains lead using Colin's own MC-V power cable. First 5 watts are SECA (Single-Ended Class A) and the rest Class A Push/Pull. The case doesn't even get warm to the touch.
It has plenty of power on tap and sounds stunning. Selling as I prefer the slightly romantic sound of my Aleph 60 monoblocks in my system and I want to run a fully balanced setup.
£1000 plus postage or collection from near Coventry. Payment via Bank Transfer only.
https://i.imgur.com/4TKWOsO.jpg
https://i.imgur.com/3qIU4jl.jpg
Colin Wonfor
26-05-2020, 21:03
Nice amp, if you need a look over to check thing out ,buyer I will happy do that FOC you just pay delv, and collection.
ijrussell
27-05-2020, 08:27
Nice amp, if you need a look over to check thing out ,buyer I will happy do that FOC you just pay delv, and collection.
That's really generous Colin. It's a very nice amp; Far too good to be boxed up and not used.
Class A, 100W, and doesn't get warm to the touch?
Class A, 100W, and doesn't get warm to the touch?
Only 1st 5 watts in class A, says that in the o/p
Brilliant amp, I've said it before that this was the only amp I tried ( and I tried few ) that managed to get my PMC standmounts going.
I wish I'd kept mine but I needed the money at the time.
Ok maybe not the prettiest amp ( sorry Colin ) but it's the inside you're paying for [emoji6]
Highly recommended
Not had the pleasure of this one but if it's anything like the Seca or the Old Claymore it will be excellent.
Colin Wonfor
27-05-2020, 21:14
Brilliant amp, I've said it before that this was the only amp I tried ( and I tried few ) that managed to get my PMC standmounts going.
I wish I'd kept mine but I needed the money at the time.
Ok maybe not the prettiest amp ( sorry Colin ) but it's the inside you're paying for [emoji6]
Highly recommended
Not pretty, the electrons are blind and move to fast to see the art work. And to busy ducking a diving to the music.
Great post Colin.
Wish I had the readies for this one.
Only 1st 5 watts in class A, says that in the o/p
I suggest you re-read the OP.
" and the rest Class A Push/Pull. "
scotty38
28-05-2020, 12:25
I suggest you re-read the OP.
" and the rest Class A Push/Pull. "
I would suggest you discuss the design parameters with Colin first.....
Damping Factor 100 - 600
Class A P/P up to 30KHz, then class A/B
Sliding dynamic bias system
There you go.
ijrussell
28-05-2020, 14:31
No longer for sale on here.
Audio Al
28-05-2020, 14:51
No longer for sale on here.
:confused: why ?
Audio Al
28-05-2020, 14:52
OK I see now , Thread crapping on a for sale forum
scotty38
28-05-2020, 15:29
OK I see now , Thread crapping on a for sale forum
Exactly!
Damping Factor 100 - 600
Class A P/P up to 30KHz, then class A/B
Sliding dynamic bias system
There you go.
Ok, had to get that clear, and nothing wrong with sliding bias, it is very often done and makes a great deal of sense. Imagine a 50+50 class A amp, producing about 222W of heat.
I am not wanting to 'thread crap' just seeking clarity.
Damping Factor 100 - 600
Class A P/P up to 30KHz, then class A/B
Sliding dynamic bias system
There you go.
Class A up to 30kHz? Really? Usually a sliding bias amp is quoted as Class A up to a given power O/P level, not a frequency, for example an ATC SIA2 is class A up to 10W O/P.
Lawrence001
30-05-2020, 11:50
I was intrigued by the specs myself but wanted to keep out of a for sale thread. But since it's been withdrawn I'll say what I found, I hope you don't mind Ian.
The below thread says that it is the driver stage that is pure class A, and mentions 1W. That doesn't seem to match other specs though, but it would explain the cool running. Perhaps Colin could be kind enough to explain to what extent the amp runs in class A in power terms rather than frequency terms (which I agree I've never seem quoted before).
https://seca.freeforums.net/thread/165/colin-wonfor-power-amplifier-review
NB everything I read about it says it sounds great, it's just a shame the discussion got distracted by technical specs rather than the SQ.
I think clarification is useful to both a seller and a buyer.
ijrussell
30-05-2020, 12:32
I was intrigued by the specs myself but wanted to keep out of a for sale thread. But since it's been withdrawn I'll say what I found, I hope you don't mind Ian.
The below thread says that it is the driver stage that is pure class A, and mentions 1W. That doesn't seem to match other specs though, but it would explain the cool running. Perhaps Colin could be kind enough to explain to what extent the amp runs in class A in power terms rather than frequency terms (which I agree I've never seem quoted before).
https://seca.freeforums.net/thread/165/colin-wonfor-power-amplifier-review
NB everything I read about it says it sounds great, it's just a shame the discussion got distracted by technical specs rather than the SQ.
I've withdrawn it from sale on here, so go ahead.
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