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Post by radfordrevival on Sept 21, 2021 21:09:04 GMT
Not been here in a while 
I have been in hiding working away on many things, one of which is my MA100 design, which appears to be finally coming together. I have been developing this for a while and the design has undergone a few revisions. I am currently building a hacked up pair of prototypes of the evolved design on a Hammond biscuit tin.
It currently doesn't look like much but in theory it should be pretty damn epic when done.
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Bigman80
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Post by Bigman80 on Sept 21, 2021 21:39:15 GMT
Nice to see you back!
The PCB layout looks really tidy and I like when things look to have been well thought out.
I thought I was over my valve addiction, then you pop up with these bad boys.
Any idea when you'll have them up and running?
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Post by antonio on Sept 22, 2021 1:49:49 GMT
Even my cheap Chinese amp has point to point wiring   Only pulling your leg, I'm sure this MA100 will be great, especially after all the good reports on your Radford amps, in fact if I had the 'dosh' I'd have purchased one for sure. |
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Post by electronumpty on Sept 22, 2021 10:33:53 GMT
Slurp! Looks great! 😛
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Post by radfordrevival on Sept 22, 2021 21:48:35 GMT
Thanks all. As I've said probably here and elsewhere the intention is to make an amp where figuratively speaking you can have your cake and eat it. A valve amp that's as easy to use / own as a solid state amp, with the clarity and openness of valves, but with the damping and control of transistor designs. I have developed some novel tricks that have allowed a genuine leap in valve amplifier performance. Amusingly it has ended up very much simpler than a lot of amps out there, given the performance achieved.
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Bigman80
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Post by Bigman80 on Sept 23, 2021 3:25:40 GMT
Thanks all. As I've said probably here and elsewhere the intention is to make an amp where figuratively speaking you can have your cake and eat it. A valve amp that's as easy to use / own as a solid state amp, with the clarity and openness of valves, but with the damping and control of transistor designs. I have developed some novel tricks that have allowed a genuine leap in valve amplifier performance. Amusingly it has ended up very much simpler than a lot of amps out there, given the performance achieved. A valve amp that's as easy to own as a solid state one? Ok.....now I'm paying attention |
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Post by electronumpty on Sept 23, 2021 8:50:25 GMT
How long before they are in production do tou think?
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optical
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Post by optical on Sept 23, 2021 8:55:26 GMT
Sounds like a recipe for satisfaction . . . .
Very interesting.
Coincidentally I love those JJ KT88 valves. Top to bottom they always sound superb. Reliable in my experience too.
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Post by radfordrevival on Sept 23, 2021 14:48:17 GMT
Nice to see you back! The PCB layout looks really tidy and I like when things look to have been well thought out. I thought I was over my valve addiction, then you pop up with these bad boys. Any idea when you'll have them up and running? How long before they are in production do tou think?
Not long now I hope!!! |
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Post by rexton on Sept 23, 2021 16:15:54 GMT
Finally! I've only been waiting 27 years for a pair!!!!!! |
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Post by radfordrevival on Feb 23, 2022 13:27:41 GMT
Nearly bloody done...
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Post by radfordrevival on Feb 23, 2022 15:55:56 GMT
Tentative specs:
BW: Subject to compensation networks - adjusted as necessary to be decent
THD: 0.02% at full power, possibly less. Decreasing with power level, typically 0.003% at around 20W.
Output impedance: 0.008 ohms 10-10Khz, rising slightly in the top octave
Hum products: 100dB below 1Vrms, only 50Hz, 3rd and 5th harmonic measurable, 10uV, inaudible with your ear literally in the speaker in a silent room. No ugly spray of mains harmonics whatsoever.
Damping down to DC - bass control exactly as good as any solid state amp.
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Post by rexton on Feb 23, 2022 19:54:06 GMT
Any chance of any more pics? when is this ready?
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Bigman80
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Post by Bigman80 on Feb 23, 2022 20:38:10 GMT
Tentative specs: BW: Subject to compensation networks - adjusted as necessary to be decent THD: 0.02% at full power, possibly less. Decreasing with power level, typically 0.003% at around 20W. Output impedance: 0.008 ohms 10-10Khz, rising slightly in the top octave Hum products: 100dB below 1Vrms, only 50Hz, 3rd and 5th harmonic measurable, 10uV, inaudible with your ear literally in the speaker in a silent room. No ugly spray of mains harmonics whatsoever. Damping down to DC - bass control exactly as good as any solid state amp. Blimey...... I am liking the looks of this. |
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Post by radfordrevival on Apr 14, 2022 21:36:12 GMT
Metalwork designed and ordered!
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Bigman80
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Post by Bigman80 on Apr 14, 2022 21:58:13 GMT
Metalwork designed and ordered! Superb. Can't wait to see the pictures. |
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Post by radfordrevival on Apr 14, 2022 22:14:05 GMT
Metalwork designed and ordered! Superb. Can't wait to see the pictures. More stuff to come soon  |
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Post by radfordrevival on May 5, 2022 18:37:26 GMT
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Bigman80
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Post by Bigman80 on May 5, 2022 19:01:51 GMT
I'm softening on my "no more valve amps" position |
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Post by radfordrevival on May 5, 2022 19:32:57 GMT
I'm softening on my "no more valve amps" position |
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Post by electronumpty on May 6, 2022 7:27:22 GMT
Nice, very clean looking lines there.
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Post by antonio on May 6, 2022 14:44:14 GMT
That looks gorgeous, no wonder you're softening to valves Oli.
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Post by firebottle on May 6, 2022 16:00:12 GMT
That does look fabulous Will. antonio I have heard an early prototype some time ago, with Wills ongoing development and his recently publish specs these are going to be epic. No warm and cuddly, just oodles of clean excellence. |
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Post by alit on May 6, 2022 16:24:17 GMT
Looks great.
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Post by radfordrevival on May 6, 2022 16:39:22 GMT
Thanks everyone! I still remember demoing it to Alan as a lashup on the desk driving a single Epos ES14, good times lol. Despite the mono set up it was sufficient to demonstrate the uncanny bass control that this design gives.
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Post by alit on May 6, 2022 16:43:31 GMT
Any idea on price?
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Post by radfordrevival on May 6, 2022 17:01:18 GMT
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Post by alit on May 6, 2022 17:25:29 GMT
Thanks.
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Bigman80
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Post by Bigman80 on May 6, 2022 17:58:54 GMT
That's a really tough price bracket to be successful/competetive in. I aplaud your ambition, and I hope it returns what you hope. |
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Post by radfordrevival on May 6, 2022 18:37:19 GMT
That's a really tough price bracket to be successful/competetive in. I aplaud your ambition, and I hope it returns what you hope.
It's a lot of money but a lot of personal time and effort has gone into this - and given the price of the equivalent from the usual suspects it's surprisingly good value!
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