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Old 11th April 2013, 04:11 PM   #2021
dazed2 is offline dazed2  Canada
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Originally Posted by labjr View Post
Each MUR2030 is a double diode.

Ahh right, thanks.... Looks like I bought too many diodes then .
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Old 11th April 2013, 04:12 PM   #2022
dazed2 is offline dazed2  Canada
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Originally Posted by buzzforb View Post
I have had one fired up and tested, but no music ever played through it. Layout will be important.
Could you explain what you mean by layout?
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Old 11th April 2013, 05:59 PM   #2023
Rixsta is offline Rixsta  United Kingdom
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Personaly from experiance i think in certain places leads need to be kept not too long and also for instance audio leads kept away from power leads.
This way there is less likely to apear noise in the audio circuit and is less likely to oscillate.

My old Zen amplifier had leads from the Mosfets to the PCB so long that it was very unstable.
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Old 11th April 2013, 11:14 PM   #2024
a.wayne is offline a.wayne  United States
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Originally Posted by buzzforb View Post
I have had one fired up and tested, but no music ever played through it. Layout will be important.
Well spill the beans , a 4 pr min is my only interest .....
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Old 11th April 2013, 11:28 PM   #2025
6L6 is offline 6L6  United States
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Originally Posted by a.wayne View Post
Want to build a 4 pr version , is this possible with these beta boards .....
Yes, with a cascode front-end and the other bits as mentioned about the V3 in Nelson's article.


Quote:
a 4 pr min is my only interest
I'm interested in it as well, but am very curious what you have in mind for chassis/heatsink. Do you have anything in mind or purchased? I think everybody would be interested in sourcing information for that project.

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Old 11th April 2013, 11:41 PM   #2026
a.wayne is offline a.wayne  United States
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Chassis would be custom built already have the materials ...

18W x 14H x17 deep it will be fan cooled on top of big sinks..... 80 watt class-A @8 ohm and very load tolerant, has to be 1 ohm stable and happy ..


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Old 11th April 2013, 11:55 PM   #2027
6L6 is offline 6L6  United States
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Good! You understand that it needs to be enormous!

Doubled input jfets, cascode, compensation caps, 800VA transformer -- all these things are going to be part of your build.
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Old 12th April 2013, 12:05 AM   #2028
6L6 is offline 6L6  United States
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Quote:
Originally Posted by dazed2 View Post
Could you explain what you mean by layout?
The layout of the amp is winding up to be a fairly critical point of this build - the seperate front-end board (the driver circuitry, so to speak) is on it's own PCB and has many connections that all need to be wired in a way that isn't conducive to making the amp unstable - and as this is such a wide-band hotrod amp, it needs attention paid to make it work.

The FE board being it's own piece makes it possible to make a V1, V2 or V3 all with the same physical board set. Cool!
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Old 12th April 2013, 12:37 AM   #2029
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Originally Posted by a.wayne View Post
Well spill the beans , a 4 pr min is my only interest .....
This weekend.

If i were to build them, monoblocks would be only consideration. I would probably go balanced over SE as you get voltage on the cheap and can get away with higher bias as a side benefit. 22V rails should get you 100W into 8 ohms all day long with only 20W dissipation per fet.

My v3 will be with Tea's boards and will be biased as high as I can get them. I will show single channel of store boards and full stereo of Tea's
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Old 12th April 2013, 02:55 AM   #2030
a.wayne is offline a.wayne  United States
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Originally Posted by 6L6 View Post
Good! You understand that it needs to be enormous!

Doubled input jfets, cascode, compensation caps, 800VA transformer -- all these things are going to be part of your build.
800...! Nope using 1kva /ch .......... No trans hum for me ..
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