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Old 17th January 2008, 07:38 AM   #1
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Default $120 battery powered tube amp on eBay??

http://cgi.ebay.com/ws/eBayISAPI.dll...m=310014259042
and
http://www.jarl.or.jp/Japanese/2_Joh...g-tube-amp.htm

Err.... what what whaaa????

Charles.
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Old 17th January 2008, 07:45 AM   #2
Colt45 is offline Colt45  Serbia
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Never heard of battery tubes?

output is probably ~0 though.
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Old 17th January 2008, 08:40 AM   #3
poynton is offline poynton  United Kingdom
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It's really only a tube headphone amp for the Ipod !

Very low output from 2P3 and 1B2 tubes.

I think the batteries would last about 15mins.

I like the DIY horns !!



Andy
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Old 17th January 2008, 11:43 AM   #4
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Just 3V! What is the output power?
It`s a very interesting kit with a good price.
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Old 17th January 2008, 12:40 PM   #5
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very neat... would make a good closet apartment stereo system
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Old 17th January 2008, 02:59 PM   #6
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Default Possible to up the power?

Wiring a wall transformer to this amp would be dirt simple... but... how much voltage? Would more input voltage make the amp more useful? (readowerful)

It looks like it'd be a fun little project to take a cheap low power amp like this and build it into an iPod amp. Replace the faux center transformer cover / battery case with a dock, and paint the whole thing gloss black to match my nano. Not exactly high end audio, but it'd look sweet.

Hell... if this thing could be built into a decent phono preamp it would actually be quite useful.

But really, I get ahead of myself. I'd love to buy it and tinker, but I'm a total Toob Noob... I know enough about electronics not to fry myself, and while adding a wall transformer plug, input selector switch, and an iPod docking station is well within my capabilities, actually modifying the amplifier circuit (or even trouble shooting) is not.

Charles.
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Old 17th January 2008, 04:02 PM   #7
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I have a schematic that uses 1S4 output tubes and 2 1.5volt batteries. It has an simple inverter to create the B+.

Sal Brisindi
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Old 17th January 2008, 04:27 PM   #8
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by Sal Brisindi
I have a schematic that uses 1S4 output tubes and 2 1.5volt batteries. It has an simple inverter to create the B+.

Sal Brisindi

Please post the circuit.
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Old 17th January 2008, 08:55 PM   #9
dhaen is offline dhaen  Europe
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Default Interesting...

Quote:
Originally posted by diegot
Just 3V! What is the output power?
It`s a very interesting kit with a good price.

My estimation: About 150mW per channel.
But through those speakers, it may sound loud......
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Old 17th January 2008, 09:54 PM   #10
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Default Re: Interesting...

Quote:
Originally posted by dhaen



My estimation: About 150mW per channel.
But through those speakers, it may sound loud......
For such power it should have an anode battery, or at least a voltage converter.
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