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Old 20th February 2009, 08:04 PM   #1
Koifarm is offline Koifarm  Netherlands
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Default Hybrid Class D with 6n6p tubes

My newest project is ready.

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- 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.
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Old 20th February 2009, 11:20 PM   #2
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Clean layout. Wish my test bench were that organized.

Are the tubes aware of the output, or kept out of the
Class-D loop?
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Old 21st February 2009, 04:33 AM   #3
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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 ?
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Old 21st February 2009, 09:36 AM   #4
Koifarm is offline Koifarm  Netherlands
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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 ).
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Old 21st February 2009, 02:46 PM   #5
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Yeah, .....great job. Looks wonderful. I'm sure it sounds wonderful too.
Cheers.
Ashok.
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Old 21st February 2009, 04:09 PM   #6
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What is the input impedance of the Hypex without input buffer opamp?
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Old 21st February 2009, 06:31 PM   #7
Koifarm is offline Koifarm  Netherlands
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Quote:
Originally posted by revintage
What is the input impedance of the Hypex without input buffer opamp?
The input impedance is 1k8(1800) Ohm.
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Old 21st February 2009, 06:45 PM   #8
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And sensitivitywithout input opamp ?
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Old 21st February 2009, 08:31 PM   #9
Koifarm is offline Koifarm  Netherlands
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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
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Old 22nd February 2009, 10:47 AM   #10
Koifarm is offline Koifarm  Netherlands
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Here the schematic of the tubebuffer.

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