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Author Topic: Portable amps  (Read 81423 times)

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Cristello

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Re: Portable amps
« Reply #130 on: December 01, 2012, 10:09:46 PM »
Maybe there should just be a Clip++...?

 :wheel: IMod, meet ClipMod!
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Deep Funk

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Re: Portable amps
« Reply #131 on: December 02, 2012, 12:23:53 AM »
Quote from: LFF on December 01, 2012, 06:45:25 PM
I need a good portable amp the size of clip+.  :)p1

That would be great.
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Solderdude

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Re: Portable amps
« Reply #132 on: December 03, 2012, 07:30:50 PM »
Quote from: dBel84 on December 01, 2012, 05:12:33 PM
iii.   Adding tubes into the mix – not many portables do this as it actually takes much more effort to get all the voltages for the tube and keep things compact. ALO, Millet and GoVibe are the only ones I know of.
..dB

There is also the very cheap Little Bear B-1. (a cheap e-bay jobby)
I extracted the schematics a while ago and made some suggestions to improve it.

here downloadable in higher res.
schematic: http://www.mediafire.com/view/?ycy89y499dbqe81

here is a thread about it... when I used to be resident at that place.
http://rockgrotto.proboards.com/index.cgi?board=b&action=display&thread=8384

Don't own one, never heard one, don't sell it, have no affiliations ...

It's a portable amp with tube so fit's this thread.
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shipsupt

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Re: Portable amps
« Reply #133 on: December 03, 2012, 11:21:42 PM »
I have one of those Bear B1's!  I won it for .99 cents on ebay!  Woot.  Anyone who is in the "all amps sound alike" camp needs to hear this amp, because it is really bad.  It might be interesting to make the changes and see if it gets better!  At first glance I'm wondering if it will still fit in the stock enclosure after the mods?

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DigitalFreak

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Re: Portable amps
« Reply #134 on: December 04, 2012, 07:24:28 AM »
Quote from: shipsupt on December 03, 2012, 11:21:42 PM
I have one of those Bear B1's!  I won it for .99 cents on ebay!  Woot.  Anyone who is in the "all amps sound alike" camp needs to hear this amp, because it is really bad.  It might be interesting to make the changes and see if it gets better!  At first glance I'm wondering if it will still fit in the stock enclosure after the mods?

I followed the links posted above and out of curiosity I nearly bought one. Thanks for saying something and stopping me from wasting my hard earned bones on crap. From the pictures the case work it looks a little rough but cute none the less. To bad it sucks
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dBel84

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Re: Portable amps
« Reply #135 on: December 04, 2012, 03:07:20 PM »
The little bear is not too far off a Millett Starving student which is itself a variant of the super simple 6DJ8 amp

Millett : http://www.pmillett.com/starving.htm




Super simple 6DJ8



To make it portable a chip in unity gain was used as a buffer and a tube with lower heater current ( 300mA as opposed to 600mA ) . Running the tube at lower B+ is going to cause the sound to be compressed,  "musical" if you like with a good glob of harmonic distortion .

There are several way to improve the sound and keep it in the compact chassis but ultimate limitation is going to be the 12V battery supply - without a switcher to get higher B+, you are limited to running the tube inadequately. There is a lot of early discussion around this on Headwize and sijosea made a pretty neat little tin amp ( but still needed an external supply )
http://www.headphoneamp.co.kr/diy_sijosae/19816





This is why I love DIY :) = but getting way off topic

..dB

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DigitalFreak

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Re: Portable amps
« Reply #136 on: December 04, 2012, 06:28:07 PM »
I've seen pics of that amp before. I think pics was once posted on head-fi by someone. Would putting something like that together with external power supply be expensive?
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dBel84

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Re: Portable amps
« Reply #137 on: December 04, 2012, 06:45:43 PM »
basic parts cost ~ $50 ish , 10 x attempts to get it to work or paying someone to make it work in such a small chassis ~ $$$   :)p8
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AstralStorm

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Re: Portable amps
« Reply #138 on: December 05, 2012, 06:49:55 AM »
It could be made $20 with transistors. So it's a starving snob amp.  :)p3

Bang for buck, nothing really beats ye olde CMoy with LM4562.
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DigitalFreak

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Re: Portable amps
« Reply #139 on: December 06, 2012, 06:03:49 AM »
Oh by the way, I've recently secured a reviewer spot on the Tralucent Audio review tour as well as a spot on the Venturecraft Go-Dap DD Socket 1 tour. I'll be reviewing and giving feedback for the Tralucent Audio's IEM as well as their T1 amp and Venturecraft's DD Socket 1 mobile DAC. Once I get some impressions down I'll check back in with my findings.

T1 amp
http://www.tralucentaudio.com/shop/index.php/portable-amplifier/tralucent-audio-t1-portable-amplifier.html

Go-Dap DD Socket 1
http://venturecraft.jp/gadget_en/news.php?news_id=36
« Last Edit: December 06, 2012, 06:09:41 AM by DigitalFreak »
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The science of properly driving headphones is a mystery for me. For starters where the hell is the steering wheel?
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The only thing in this world that's truly neutral is Switzerland
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