Tube pre-amp + Class-D amp. any experience?

rvrazvan · 22nd March 2011, 06:40 PM

I won't let go of tube amps but in i might build a Class-d amp with a tube preamp for a friend. I'm also considering to build an 3 or four way Ob sometime in the future with tube preamps.
Any experience with this?

Miniwatt · 22nd March 2011, 06:48 PM

I've heard very good things about it.

rvrazvan · 23rd March 2011, 12:14 PM

up

Magz · 24th March 2011, 01:44 PM

I run a modified Supratek Chenin tube pre with Gilmore Raptor Class D monoblocks and they sound excellent with my Infinity RSIIb speakers.

rvrazvan · 24th March 2011, 03:21 PM

Usually people complain about the lack of "life" in class d amps. they have great clarity great dynamics but the sound is not touching. Does the pre-amp heal this?

Helmuth · 24th March 2011, 03:48 PM

pmillett · 24th March 2011, 07:15 PM

You might want to look at Ohashi-san's class-D hybrid:

Class-D Description

Pete

revintage · 24th March 2011, 07:40 PM

If one have an UCD, the above circuit will not be of any use as the amp already have enough gain. Can only get worse with another stage whether tube or sand.

If you insted remove the OP-amp built in the UCD and instead use an unbalanced to balanced tubestage, a mod will be understandable. Talked to the UCD-people a whike ago and we agreed this could be the solution for those wanting to make a hybrid.

Wavebourn · 24th March 2011, 08:29 PM

Last year I started developing such an amp, but gave up temporarily... It has tubes, video current comparator ICs, and MOSFETs. Should sound really nice, theoretically.

rvrazvan · 24th March 2011, 08:55 PM

I'm gonna give it a try i think. Hope i can find the tripath chips here

22nd March 2011, 06:40 PM	#1
rvrazvan diyAudio Member Join Date: Jul 2010	Tube pre-amp + Class-D amp. any experience? I won't let go of tube amps but in i might build a Class-d amp with a tube preamp for a friend. I'm also considering to build an 3 or four way Ob sometime in the future with tube preamps. Any experience with this?

24th March 2011, 03:48 PM	#6
Helmuth diyAudio Member Join Date: Oct 2008 Location: Winterswijk	__________________ ( (( KUGELWELLE )) ) recent projects :OB-mk1 /fatboy / monitor-xl / Horn-AM / dappolito / td124-mk1-rb301 / Hybrid-pse / Vfet

24th March 2011, 08:29 PM	#9
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	Last year I started developing such an amp, but gave up temporarily... It has tubes, video current comparator ICs, and MOSFETs. Should sound really nice, theoretically. __________________ If I disappear suddenly, that means I finally created a time machine and pushed wrong button that brought me to Stalin's Russia. In any experiment any result is the result. Even if it is negative.

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22nd March 2011, 06:48 PM	#2
Miniwatt diyAudio Member Join Date: Nov 2004 Location: Den Haag	I've heard very good things about it.

23rd March 2011, 12:14 PM	#3
rvrazvan diyAudio Member Join Date: Jul 2010	up

24th March 2011, 01:44 PM	#4
Magz diyAudio Member Join Date: Oct 2009 Location: New Jersey, USA	I run a modified Supratek Chenin tube pre with Gilmore Raptor Class D monoblocks and they sound excellent with my Infinity RSIIb speakers.

24th March 2011, 03:21 PM	#5
rvrazvan diyAudio Member Join Date: Jul 2010	Usually people complain about the lack of "life" in class d amps. they have great clarity great dynamics but the sound is not touching. Does the pre-amp heal this?

24th March 2011, 07:15 PM	#7
pmillett diyAudio Member Join Date: May 2005 Location: Dallas (but I am not a Texan!)	You might want to look at Ohashi-san's class-D hybrid: Class-D Description Pete

24th March 2011, 07:40 PM	#8
revintage diyAudio Member Join Date: May 2007	If one have an UCD, the above circuit will not be of any use as the amp already have enough gain. Can only get worse with another stage whether tube or sand. If you insted remove the OP-amp built in the UCD and instead use an unbalanced to balanced tubestage, a mod will be understandable. Talked to the UCD-people a whike ago and we agreed this could be the solution for those wanting to make a hybrid.

24th March 2011, 08:55 PM	#10
rvrazvan diyAudio Member Join Date: Jul 2010	I'm gonna give it a try i think. Hope i can find the tripath chips here

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