Class D amplifier with tube preamp on input any ideas

jazzman06 · 24th June 2009, 08:49 PM

Have someone any ideas about this idea?

ja2dhc · 25th June 2009, 10:28 AM

I found a good DIY kit as below.

http://www.tentlabs.com/Products/DIY...amplifier.html

jazzman06 · 25th June 2009, 12:10 PM

it's nice but i want to to something like thi by myself

ja2dhc · 25th June 2009, 02:22 PM

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

jazzman06 · 25th June 2009, 06:14 PM

ja2dhc - can u tell me where did you get theese chips?
and how much do you pay for them
thanks!

jazzman06 · 25th June 2009, 06:22 PM

ja2dhc - can u tell me where did you get theese chips?
and how much do you pay for them
thanks!

ja2dhc · 26th June 2009, 01:12 AM

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.

tubesteve · 4th July 2009, 08:03 AM

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

darkfenriz · 4th July 2009, 03:57 PM

Wow, what a tradeoff to use an efficient amplifier just to waste heat for filaments.

tubesteve · 5th July 2009, 12:44 AM

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.

24th June 2009, 08:49 PM	#1
jazzman06 diyAudio Member Join Date: Apr 2009	Class D amplifier with tube preamp on input any ideas Have someone any ideas about this idea? __________________ best regards MAXIM

25th June 2009, 12:10 PM	#3
jazzman06 diyAudio Member Join Date: Apr 2009	it's nice but i want to to something like thi by myself __________________ best regards MAXIM

25th June 2009, 06:14 PM	#5
jazzman06 diyAudio Member Join Date: Apr 2009	ja2dhc - can u tell me where did you get theese chips? and how much do you pay for them thanks! __________________ best regards MAXIM

25th June 2009, 06:22 PM	#6
jazzman06 diyAudio Member Join Date: Apr 2009	ja2dhc - can u tell me where did you get theese chips? and how much do you pay for them thanks! __________________ best regards MAXIM

4th July 2009, 08:03 AM	#8
tubesteve diyAudio Member Join Date: May 2009 Location: since 1998 in China as an electronic consulting design and testing engineer	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 __________________ The amount of humans is increasing, but the amount of available intelligence remains a constant.


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25th June 2009, 10:28 AM	#2
ja2dhc diyAudio Member Join Date: Dec 2007	I found a good DIY kit as below. http://www.tentlabs.com/Products/DIY...amplifier.html

4th July 2009, 03:57 PM	#9
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	Wow, what a tradeoff to use an efficient amplifier just to waste heat for filaments.

5th July 2009, 12:44 AM	#10
tubesteve diyAudio Member Join Date: May 2009 Location: since 1998 in China as an electronic consulting design and testing engineer	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. __________________ The amount of humans is increasing, but the amount of available intelligence remains a constant.

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