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Old 2nd June 2012, 12:35 AM   #2021
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Any suggestion for a Vbe please?

For R20, I intend to use a 5K-1/2w pot in parallel with a 330R-3W, a 3W pot would be something that is difficult to find. Will that work ? I have implemented that in the new pcb too.
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Old 24th June 2012, 10:52 PM   #2022
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Hi,

Maybe I did not phrase this right : if we are to use IRFP240/9240, how do we alter the circuit to do so? Thank you.

BP
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Old 25th June 2012, 06:51 AM   #2023
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I think this amp does not need any change. It has produced great results for clones if they faithfully follow some specific things.
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Old 25th June 2012, 08:19 AM   #2024
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Quote:
Originally Posted by nikosokey View Post
I think this amp does not need any change. It has produced great results for clones if they faithfully follow some specific things.
......I'm totaly agree ,no need to change component in schematic .
Alex.
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Old 25th June 2012, 08:27 AM   #2025
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Hi nikosokey,

I am not saying I am trying to make it better. Just to make it more flexible. The IRFP are easier to get than the 2sk's and it is always nice to have an alternative, right? Even it is only 90% as good, it is still worth to try out, Don't you think so?

regards
BP
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Old 25th June 2012, 08:39 AM   #2026
Jay is offline Jay  Indonesia
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Bigpanda, I think Niko and Alex are referring to the extra cascode in the VAS LTP
If you want to improve the schematic, you can try better device such as the FZT parts for the VAS.

Last edited by Jay; 25th June 2012 at 08:43 AM.
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Old 25th June 2012, 09:19 AM   #2027
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Quote:
Originally Posted by bigpanda View Post
Hi nikosokey,

I am not saying I am trying to make it better. Just to make it more flexible. The IRFP are easier to get than the 2sk's and it is always nice to have an alternative, right? Even it is only 90% as good, it is still worth to try out, Don't you think so?

regards
BP
You cannot interchange Lateral Mosfet and Hexfet without some modifications to the circuit. You will end up with thermal runaway. Besides changing would make it a different schematic requiring a totally different board.
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Last edited by Nico Ras; 25th June 2012 at 09:21 AM.
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Old 25th June 2012, 09:31 AM   #2028
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Quote:
Originally Posted by Jay View Post
Bigpanda, I think Niko and Alex are referring to the extra cascode in the VAS LTP
If you want to improve the schematic, you can try better device such as the FZT parts for the VAS.
i think you can change some the value, it is the better the sound!

Use FZT 857 and 957
thanks
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Old 25th June 2012, 09:40 AM   #2029
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Originally Posted by quanghao View Post
i think you can change some the value, it is the better the sound!

Use FZT 857 and 957
thanks
Αt this point agree due to temperature that grow on the transistors Mpsa 93-43.
If this sounds better (FZT 857 and 957) do not know.
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Last edited by nikosokey; 25th June 2012 at 09:46 AM.
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Old 25th June 2012, 09:42 AM   #2030
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Quote:
Originally Posted by nikosokey View Post
Αt this point agree due to temperature that grow on the transistors Mpsa 93-43.
If this sounds better (FZT 857 and 957) do not know.
yes! but change some value for low current, and change bias to biger

150R to 220R
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Last edited by quanghao; 25th June 2012 at 09:49 AM.
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