Class D amplifier with tube preamp on input any ideas

[jazzman06]

Have someone any ideas about this idea?

 

[ja2dhc]

I found a good DIY kit as below.

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

 

[jazzman06]

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

 

[ja2dhc]

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]

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

 

[jazzman06]

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

 

[ja2dhc]

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]

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

 

[darkfenriz]

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

 

[tubesteve]

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.