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Old 5th March 2019, 02:42 AM   #8801
kissabout2002 is offline kissabout2002  Italy
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Quote:
Originally Posted by 6A3sUMMER View Post
Very Creative!

Inspires me. I may build a 'headphone amp' for very small efficient speakers that are right behind my pillow. Drive them from a CD player.
Push Pull 10k to 8 Ohms Edcore or Hammond.
Thanks 6A3sUMMER, actually your posts also inspires me a lot, I always read and take notes from your comment, I really like the way you take to ground level some explanation, I find them very easy to understand....all the best

Quote:
Originally Posted by dhaen View Post
There is a certain lack of art among us technical types, with a few exceptions, as above.
It would be encouraging to see better art in amplifier design, I see many radical images in speaker design, so why can't we deliver?
Yes I completely agree.....thanks and all the best

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Originally Posted by Evenharmonics View Post
I beg to differ.
mmmmmm....the picture you post give me some new idea....
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Old 5th March 2019, 04:03 AM   #8802
Wavebourn is offline Wavebourn  United States
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Quote:
Originally Posted by 6A3sUMMER View Post
Very Creative!

Inspires me. I may build a 'headphone amp' for very small efficient speakers that are right behind my pillow. Drive them from a CD player.
Push Pull 10k to 8 Ohms Edcore or Hammond.
I saw seats in buses, with speakers in headrests, under leather. They were small, but with pretty stiff cones.
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Old 7th March 2019, 07:18 PM   #8803
JoeAlders is offline JoeAlders  Netherlands
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"It would be encouraging to see better art in amplifier design, I see many radical images in speaker design, so why can't we deliver?"


Because we are in the first place technical designers not in the first place art designers.
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Old 8th March 2019, 06:38 AM   #8804
vuohi is offline vuohi  Finland
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Quote:
Originally Posted by dhaen View Post
There is a certain lack of art among us technical types, with a few exceptions, as above.
It would be encouraging to see better art in amplifier design, I see many radical images in speaker design, so why can't we deliver?
Probably because housing both artistic vision (and the ability to execute it) and technical skill in the same brain is a very rare commodity.

But having said that, I don't think there is a massive shortage of nice looking amps here. Then again building a speaker does tend to give some more wiggle room in terms of visual design. It doesn't get hot, fewer large components, it usually has much more allocated space in the room, no need to keep the leads very short and so on. If visual design is your main goal, then I would definitely recommend building speakers first rather than amplifiers.
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Old 11th March 2019, 05:16 AM   #8805
CBS240 is offline CBS240  United States
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Hi.
I went and done a controversal thing....mixing technologies. Most of my electronic experience is with solid state. My latest stereo project is a SS amplifier HERE. However, I have two old TRF radios that belonged to my grandfather. 1928 Atwater Kent w/electrostatic speaker, which I intend to restore. It looks good but needs power supply. But the 1925 TRF was unfortunately not restorable. The variable capacitors are not in good order and evidently mice had made a nest inside and chewed up all the wires. It's a real mess. However, the tubes check out OK. .
I re-designed the VAS section of my SS amp to use these old UX201A type triodes as the amplifying devices. After studying the datasheet, it seemed like a nice linear device. This is what happens when DIYaudio'ers have too much free time. Where many see nostalgia I see functionality. That being said, they look cool too. I used the triode direct coupled, as if it were a J-fet, a super J-fet. Ha! I do have one question, I use a floating CCS at about 235mA. I read that going too low on the filiment bias on DHTs can cause deterioration, but they are almost 100years old! Should I be running them at the full rated max of 250mA or will this be OK?
Except for the input cap, the amp is direct coupled. Output rail voltage is +/-30V. The plate is loaded with a CCS and the output stage EC following stage. The follower stage has a very high input Z, over 1M. All of this leaves the triode to bias at a constant current, 3mA.
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Old 11th March 2019, 05:30 AM   #8806
CBS240 is offline CBS240  United States
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This is 10KHz sqr wave, each channel. Also, here is a sketch of the circuit I came up with. The voltage regulator circuits ouput is +40/-140V @ 5mA, for each channel. I do not intend to make anymore amps like this because the tubes are fairly rare. But, for my home audio system, it is hard to beat!.
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Last edited by CBS240; 11th March 2019 at 05:50 AM.
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Old 11th March 2019, 11:56 AM   #8807
jdg123 is offline jdg123  United States
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I for one, think you represent the best in DIY audio, making use of what you've got and appreciating the usefulness and beauty of the old and new. Congratulations!

Oh yes, there is a thread or two in "filament starving" indicating to me there is no real problem with a bit of underpowering DHT filiments...you'd get more out of what's written than I have I'm sure. Your knowledge is impressive 😀
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Old 11th March 2019, 09:38 PM   #8808
mhouston is offline mhouston  Australia
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Now thats different.
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Old 12th March 2019, 06:31 PM   #8809
multi is offline multi  Australia
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Even a standard box amplifier can look very good, stainless steel bolts good layout and thick metal to minimize vibration..
Not very one wants a punk design

Not that I am against artistic designs if you like this.
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Old 18th March 2019, 10:20 AM   #8810
andrejg is offline andrejg  Slovenia
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Two of my toys:
- Aikido LV 48V with added headphone out
- S-5 Electronics K-16LS
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