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Old 16th November 2012, 11:46 AM   #31
Haze13 is offline Haze13  Israel
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Indianojo, I think that there is some thing like this in Russia, but now I live in Israel... Here it's better to order some things from other countries then buying in Israel.
I see on ebay aluminum enclosures for power amps for 50$ and 40 for shipping and this is realy cheap! Here those things may cost alot more...

to CBS240 and Ian Finch:
I understand that Hi-fi amps must be as transperent as possible and Guitars amps not. I was using tube guitar amp and instrument to compare circuits, caps, transistors etc... and based on the tests that I made, I do belive that Audio caps, Jfet and Opamps for HI-fi sounds mutch better than things that weren't made for audio.
That's why I wan't to build an amp that uses quality parts, based on my observations. Jfets and mosfets in signal chain, Class A Singe Ended.
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Old 16th November 2012, 11:48 AM   #32
Haze13 is offline Haze13  Israel
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Correct me if I wrong of course!
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Old 16th November 2012, 02:30 PM   #33
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What's the motivation for choosing class A single ended? Emulating a 300B?
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Old 16th November 2012, 03:39 PM   #34
Haze13 is offline Haze13  Israel
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300b is some kind of a legend in Hi-Fi world... I was thinking building this one, but it's has to be or perfect or none at all. For the perfection I have no money, and don't willing to build a "wanna-be".
I hear very good things about Aleph family by Nelson Pass so that's the direction. Of course this one is going to be pretty expensive too, so may be some sort of an Le Monstre, but with a little bit more power and with mosfets. There is DX Destroyer too, the amp that has no less fame than Aleph and Le mosntre. But he is with BJT's all the way through...

At diyaudioprojects there is an version of Hiraga's 30 watt class a amp, that Dan W had done. From what I see it's to channels (left and right), but in one Enclosure. Aleph familiy amps are saperate monoblocks. Does MosFets heat up more that BJT?
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Old 16th November 2012, 03:44 PM   #35
Haze13 is offline Haze13  Israel
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And one more thing...
Power Supply: There are those with votage regulators and those with big caps only. This is because of high current only, or because of the noise from voltage reguators?
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Old 16th November 2012, 05:10 PM   #36
CBS240 is offline CBS240  United States
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Quote:
Does MosFets heat up more that BJT?
If the amplifier is bias class A it does not matter, they dissipate the same heat, but for class AB mosfets are usually bias in a range of 100-200mA while the optimum bias for BJTs is 20-40mA so idle power is usually higher with mosfets. (This is because mosfets have a significant drop in Gm (transconductance) at currents below 200mA.) The trade off is that mosfets do not suffer from secondary breakdown so they can operate at higher temperatures across reactive loads like speakers.
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Old 16th November 2012, 08:12 PM   #37
Haze13 is offline Haze13  Israel
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Thanks
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