Class D amplifier with tube preamp on input any ideas - diyAudio
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Old 24th June 2009, 07:49 PM   #1
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Default Class D amplifier with tube preamp on input any ideas

Have someone any ideas about this idea?
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Old 25th June 2009, 09:28 AM   #2
ja2dhc is offline ja2dhc  Japan
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I found a good DIY kit as below.

http://www.tentlabs.com/Products/DIY...amplifier.html
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Old 25th June 2009, 11:10 AM   #3
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it's nice but i want to to something like thi by myself
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Old 25th June 2009, 01:22 PM   #4
ja2dhc is offline ja2dhc  Japan
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Quote:
Originally posted by jazzman06
it's nice but i want to to something like thi by myself
How about the below URL ? I am working on this hybrid amp.
I will initiate a new theread when it will come up.

http://ja1cty.servehttp.com/class-d/ClassD-AMP.gif
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Old 25th June 2009, 05:14 PM   #5
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ja2dhc - can u tell me where did you get theese chips?
and how much do you pay for them
thanks!
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Old 25th June 2009, 05:22 PM   #6
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ja2dhc - can u tell me where did you get theese chips?
and how much do you pay for them
thanks!
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Old 26th June 2009, 12:12 AM   #7
ja2dhc is offline ja2dhc  Japan
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Quote:
Originally posted by jazzman06
ja2dhc - can u tell me where did you get theese chips?
and how much do you pay for them
thanks!
IRS-2092 is popular chip. You can get it from various dealers
in the world.
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Old 4th July 2009, 07:03 AM   #8
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Default tube pre amplifier

a 12AU7 stereo pre amp is available, operating from 12V DC. internally 42 VDC is created, therefore working on a harmless voltage. the board is small, 60 x 100mm. the seller is arjen helder, a dutch engineer in china. just look on ebay. it works with all kind of amps, not only class D.

short data: 11Hz to 253KHz ( 3dB ), max gain: 22dB, 90dB S/N, 11.5V to 14.4VDC, 170mA
THD @ 750mV out: 0.15%

believe it is : arjen_helder electronic
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Old 4th July 2009, 02:57 PM   #9
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Wow, what a tradeoff to use an efficient amplifier just to waste heat for filaments.
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Old 4th July 2009, 11:44 PM   #10
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yeah, i know, u are right. but how about a car and its efficiency? dont you have one? efficiency isnt all, what counts, otherwise we should shut down a lot of things, we like to do. as an engineer, i wish more efficient things, but its difficult to realize.
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