Hybrid Class D with 6n6p tubes

Koifarm · 20th February 2009, 08:04 PM

My newest project is ready.

- More detail, instruments and artist are clearer.
- More staging also left, right and behind me plays the music.
- More midbass, the snaredrums lance the speaker conus.
- Very easy playing and nice to listen to.

This is in comparision to the audioromy fu13 in own.

I used:

- Brothers LU 64 db step volume controll with input select and remote. ( custom made with 20 sec. delay ).
- 6n6p SRPP tubebuffer.
- Hypex UCD400 class D amplifier.
- Redrock 1000 Watt SMPS.
- DIY Gene aluminium case.

kenpeter · 20th February 2009, 11:20 PM

Clean layout. Wish my test bench were that organized.

Are the tubes aware of the output, or kept out of the
Class-D loop?

ashok · 21st February 2009, 04:33 AM

How does the sound compare ..direct input to the UcD modules and via the tubed input stage .

dc or ac heater voltage ?
Regulated tube supply ?

How is the hum level ? Non-existent or very low ?

Very neat and nice looking. Great job.

I don't think I'll ever get my surroundings to look so neat and clutter free ! Or is that out of view behind the camera ?

Dynaudio 52's ?

Koifarm · 21st February 2009, 09:36 AM

Thanks for the nice reply's.

Quote:

Originally posted by kenpeter

Are the tubes aware of the output, or kept out of the
Class-D loop?

They are kept out of the Class-D loop. This to keep it simple and i do not like feedback in analoge audiopath.

Quote:

Originally posted by ashok
How does the sound compare ..direct input to the UcD modules and via the tubed input stage .

After listening to hypex modules for several years i got bored of the sound. Bypassing the hypex inputbuffer ( opamp ) and adding a tube buffer makes the sound more live like, less boring a kind of sparking was added by the tubebuffer. I tried several tube setup's ( principals, brands and type's) but the 6n6p in SRPP i like the best. Just one capacitor in the analogepath

Quote:

dc or ac heater voltage ?
Regulated tube supply ?

DC heater supply right from the SMPS. Anode tube supply right from the SMPS ( 60 Volt ).

Quote:

How is the hum level ? Non-existent or very low ?

No humm perceptible on my dynaudio's.

Quote:

I don't think I'll ever get my surroundings to look so neat and clutter free ! Or is that out of view behind the camera ?

Dynaudio 52's ?

Yes, the speakers are Dynaudio Audience 52 modded with soundpulp ( aramid wool ).

ashok · 21st February 2009, 02:46 PM

Yeah, .....great job. Looks wonderful. I'm sure it sounds wonderful too.

Cheers.
Ashok.

revintage · 21st February 2009, 04:09 PM

What is the input impedance of the Hypex without input buffer opamp?

Koifarm · 21st February 2009, 06:31 PM

Quote:

Originally posted by revintage
What is the input impedance of the Hypex without input buffer opamp?

The input impedance is 1k8(1800) Ohm.

revintage · 21st February 2009, 06:45 PM

And sensitivitywithout input opamp

?

Koifarm · 21st February 2009, 08:31 PM

Lars, the buffer amplifies 4,5 times so for max. power you need 9 Volt in. See specs below:

http://www.hypex.nl/docs/UcD400OEM_datasheet.pdf

Koifarm · 22nd February 2009, 10:47 AM

Here the schematic of the tubebuffer.

20th February 2009, 08:04 PM	#1
Koifarm diyAudio Member Join Date: Aug 2005	Hybrid Class D with 6n6p tubes My newest project is ready. - More detail, instruments and artist are clearer. - More staging also left, right and behind me plays the music. - More midbass, the snaredrums lance the speaker conus. - Very easy playing and nice to listen to. This is in comparision to the audioromy fu13 in own. I used: - Brothers LU 64 db step volume controll with input select and remote. ( custom made with 20 sec. delay ). - 6n6p SRPP tubebuffer. - Hypex UCD400 class D amplifier. - Redrock 1000 Watt SMPS. - DIY Gene aluminium case.

21st February 2009, 04:33 AM	#3
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	How does the sound compare ..direct input to the UcD modules and via the tubed input stage . dc or ac heater voltage ? Regulated tube supply ? How is the hum level ? Non-existent or very low ? Very neat and nice looking. Great job. I don't think I'll ever get my surroundings to look so neat and clutter free ! Or is that out of view behind the camera ? Dynaudio 52's ? __________________ AM

21st February 2009, 02:46 PM	#5
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	Yeah, .....great job. Looks wonderful. I'm sure it sounds wonderful too. Cheers. Ashok. __________________ AM

21st February 2009, 04:09 PM	#6
revintage diyAudio Member Join Date: May 2007 Location: Eskilstuna, Sweden	What is the input impedance of the Hypex without input buffer opamp? __________________ Brgds Lars

21st February 2009, 06:45 PM	#8
revintage diyAudio Member Join Date: May 2007 Location: Eskilstuna, Sweden	And sensitivitywithout input opamp ? __________________ Brgds Lars

20th February 2009, 11:20 PM	#2
kenpeter diyAudio Member Join Date: Nov 2007 Location: Dallas	Clean layout. Wish my test bench were that organized. Are the tubes aware of the output, or kept out of the Class-D loop?

21st February 2009, 08:31 PM	#9
Koifarm diyAudio Member Join Date: Aug 2005	Lars, the buffer amplifies 4,5 times so for max. power you need 9 Volt in. See specs below: http://www.hypex.nl/docs/UcD400OEM_datasheet.pdf

22nd February 2009, 10:47 AM	#10
Koifarm diyAudio Member Join Date: Aug 2005	Here the schematic of the tubebuffer.

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