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First Watt M2 clone, help needed ll ease
First Watt M2 clone, help needed ll ease
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Old 7th July 2018, 03:41 PM   #1
daniel4381 is offline daniel4381
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Join Date: Jul 2014
Default First Watt M2 clone, help needed ll ease

I have started building the M2. I am using a DIY speaker, "Finalist" of Jim Holtz. This is wonderful Speaker but efficiency is around 86 db. I have tested the speaker with M2 (of my friend) along with a Tube pre (DIY, 28 db gain) , and the sound quality was so wonderful that I have instantly started collecting the parts for M2. (I already have the tube pre). I have following questions to ask to the valued members:
1. Is there any scope of increasing the output watt.
2. Do I need any speaker protection and soft start switch in it.
3. Do I need to install any thermostat, or it already has.
4. Any other suggestions.

I have very shallow knowledge on electronics , my friend who is an expert is helping me for this. Looking forward for some suggestions.
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Old 7th July 2018, 03:54 PM   #2
chat72 is offline chat72
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1 Not sure.
2 I don't use them and there is no problem so far.
3 There is thermistor for inrush current but no thermostat.
4 I suggest you should try m2x.
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Old 7th July 2018, 04:06 PM   #3
Russellc is offline Russellc  United States
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First Watt M2 clone, help needed ll ease
I have looked at the finalist before...interesting speaker.

You will need preamp with some giddyup for sure.

Russellc
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Old 7th July 2018, 04:08 PM   #4
mpmarino is offline mpmarino  United States
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1. Increase the rail voltage
1a. You'd have to cascode the Jfets
1b. Dissipation would increase = new set of considerations
1c. would still be ~15dB gain, as it is the edcor that develops the gain
2. I don't , but I don't worry about such things. As it sits it is a rock solid design.
3. No need if your sinks are appropriate, and the design is right (did it get messed up by increasing rails?)
4. Please correct me if I am insane, or wrong
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Old 7th July 2018, 05:49 PM   #5
daniel4381 is offline daniel4381
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Quote:
Originally Posted by chat72 View Post
1 Not sure.
2 I don't use them and there is no problem so far.
3 There is thermistor for inrush current but no thermostat.
4 I suggest you should try m2x.
Thank you, I was thinking abt M2x but never heard it, so confused, as I have tested my speaker with it and preamp ( actually I connected M 2 with 4 pre, 2 SS and 2 tube pre, and the one I have selected out perform all, all were quality preamp but the DIY tube matched better).
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Old 7th July 2018, 05:52 PM   #6
daniel4381 is offline daniel4381
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Join Date: Jul 2014
Quote:
Originally Posted by Russellc View Post
I have looked at the finalist before...interesting speaker.

You will need preamp with some giddyup for sure.

Russellc
Finalist is a real gem, specially in mid range and sound stage.
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Old 7th July 2018, 06:05 PM   #7
daniel4381 is offline daniel4381
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Join Date: Jul 2014
Quote:
Originally Posted by mpmarino View Post
1. Increase the rail voltage
1a. You'd have to cascode the Jfets
1b. Dissipation would increase = new set of considerations
1c. would still be ~15dB gain, as it is the edcor that develops the gain
2. I don't , but I don't worry about such things. As it sits it is a rock solid design.
3. No need if your sinks are appropriate, and the design is right (did it get messed up by increasing rails?)
4. Please correct me if I am insane, or wrong
Thanks for you suggestion, I'll try to implement, though it need good electronic know how, I'll take help of my friend , who has implemented lots of DIY amp. I am really worried abt speaker protection 'cause I have previously fried my Tannoy with a DIY amp that didn't have any protection. I am also thinking about degradation of sound (if any) with china made speaker protection board.
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Old 7th July 2018, 11:13 PM   #8
chat72 is offline chat72
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Quote:
Originally Posted by daniel4381 View Post
Thank you, I was thinking abt M2x but never heard it, so confused, as I have tested my speaker with it and preamp ( actually I connected M 2 with 4 pre, 2 SS and 2 tube pre, and the one I have selected out perform all, all were quality preamp but the DIY tube matched better).
M2 and m2x are the same, but m2x allow you to change the input buffer.
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Old 9th July 2018, 12:02 AM   #9
6L6 is offline 6L6  United States
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First Watt M2 clone, help needed ll ease
1) No.
2) It already has inrush protection. (soft start) I wouldn't bother with output protection.
3) Not needed if your heatsinks/case are properly sized.
4) It's a great amplifier, truly special. You'll love the project!


Quote:
Originally Posted by daniel4381 View Post
1. Is there any scope of increasing the output watt.
2. Do I need any speaker protection and soft start switch in it.
3. Do I need to install any thermostat, or it already has.
4. Any other suggestions.
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