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Old 13th March 2009, 11:06 AM   #21
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Aspen amp

http://www.aksaonline.com/products/products_aksa55.html


if you have fullrange=efficent , you dont need 150w

PASS miniA and F5 are so simple an cheapers , and dont thinks that you can found a better diy SS amp , the only problem is that are hot amp
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Old 13th March 2009, 12:14 PM   #22
pjanda1 is offline pjanda1  United States
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I second the chipamp.com and Peter Daniel boards. Keep the chassis construction simple (unlike what I did). If you are looking for a similar tube amp project (similar in that everything is on a PCB), check out George's SimpleSE: http://www.tubelab.com/SimpleSE.htm You'll find lots of support for it over here. If you do need comlete, step by step instructions, I'd go with Bottlehead.

pj
www.wildburroaudio.com

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Old 13th March 2009, 12:58 PM   #23
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"George's SimpleSE"

nice
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Old 13th March 2009, 01:46 PM   #24
mikje is offline mikje  United States
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I haven't done one of these yet, but I have been in contact with the folks at S5electronics and they seem very helpful.

http://www.s5electronics.com/thome.html

Plus, there is plenty of info on the web about these kits and some modding/upgrading info. They come complete too; no searching for transformers, etc. The price can hardly be beat as well. With mono kits starting at $150 and stereo kits starting at under $200, they look like good kits for beginners.
Just my 2 cents worth...
Mike
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Old 13th March 2009, 01:51 PM   #25
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Here is a board that I just bought and should be getting soon for under $50.

T amp board with a 20W output.

T Amp Boards from P-Mac Audio
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Old 13th March 2009, 06:10 PM   #26
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I've built a couple of Gainclones with the 3875 and the 3886. I've also built the s5 electronics tube amp. The biggest problem is DC offset. And the same is true with the current amplifier that I'm using the Nu Force Icon. I used to listen to Sonic Impact T-amp that was better, but with efficient drivers its tough not to hear dc offset, especially since I am neafield. My Gainclones got better and better as I learned more about interference. I am friends with Brian Bell (chipamp.com) and he and I built a couple amps and he showed me a lot of tricks, but sitting nearfield I think that T-amps are the best. Otherwise I loved the sound of my tube amp at larger distances, although I don't think the amp has quite enough power and bass output. My kit was heavily modified as well. I need to pull it out again and listen.

Josh
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Old 15th March 2009, 11:17 AM   #27
Forsman is offline Forsman  Sweden
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As the noob I am I wonder what kind of amplifier it takes to support a pair of full range speakers. Iím planning to build a pair of Ronís Austin II, A166 (or III from hifiZens drawings). Are there any affordable options? Are there any specific characteristics that I should pay attention to when it comes to support a pair of full range speakers? How much output effect do the Austinís require, most tube amps seams to have very low output?

/Fredrik
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Old 15th March 2009, 12:58 PM   #28
rkevans is offline rkevans  United States
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Quote:
Originally posted by Forsman
How much output effect do the Austinís require, most tube amps seams to have very low output?

/Fredrik
"That motorcycle cannot be very fast, it only has a 750cc engine.
My Volvo V70 with a 3200cc petrol engine is clearly a better solution for speed, the engine is several times larger."

Efficient speakers (such as the Austin) with small tube amps (3 to 5 watts) are the motorcycle.

The V70 with a 750cc engine would be a mistake. But for the bike, it's a natural choice.

Rick
My avatar is a 3wpc tube amp resting on the hood (bonnet) of my STi
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Old 15th March 2009, 03:04 PM   #29
Forsman is offline Forsman  Sweden
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Quote:
Originally posted by rkevans
"That motorcycle cannot be very fast, it only has a 750cc engine.
My Volvo V70 with a 3200cc petrol engine is clearly a better solution for speed, the engine is several times larger."
Thanks for the grate analogy, very vivid. Iíd rather have the motorcycle

As far as I understand, in theory a driver in a horn can be up to a 100 times more efficient than the same driver mounted in a box. In the Austin A166 there is a Fostex 166 at 65 w. Then that figure is irrelevant.
Interesting that the horn is so efficient that I doesnít need more than 3-5 w? Then there is a lot more DYI amp kits to choose between.

/Fredrik
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Old 15th March 2009, 06:11 PM   #30
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Quote:
Originally posted by Forsman
As the noob I am I wonder what kind of amplifier it takes to support a pair of full range speakers. Iím planning to build a pair of Ronís Austin II, A166 (or III from hifiZens drawings). Are there any affordable options? Are there any specific characteristics that I should pay attention to when it comes to support a pair of full range speakers? How much output effect do the Austinís require, most tube amps seams to have very low output?
You want an amplifier with a highish output impedance. Unless you want to play at levels that push the 166 (and your ears) to the limit, 2-10W is sufficient.

A relatively affordable amp would be something like the RH84, some of the bottleheads, used Decware Zen (SE tube amps tend to have higher output impedance). A bit more costly are things like SEWA, firstwatt F1, F2.

People use a lot of different amps with these, an amp with a lower output impedance can be tamed to some extent by using very thin speaker wire.

dave
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