The Pi2Design 503HTA Hybrid Tube DAC thread

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The Pi2Design 503HTA Hybrid Tube DAC thread

Postby michelangelo » Fri Nov 18 2016 17:03

Pi2Design 503HTA Hybrid Tube DAC

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WHAT IS?
It's an hybrid Tube DAC\Headphone AMP\ Preamplifier.

AVAILABLE CONNECTIONS

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HOW TO USE IT WITH VOLUMIO

- Write Volumio to your SD Card
- Attach the 503HTA Hybrid Tube DAC to your PI
- Boot it up
- Install and enable the 503HTA Plugin (from accessories category)
- From playback options, enable I2S DAC and select 503HTA Hybrid Tube DAC-
- You will be asked to reboot, just do it
- This DAC does not have ANY hardware Volume control that Volumio can directly control. To ensure the best audio quality, we suggest to use the handy phisical Volume potentiometer. If you want to control Volume directly from Volumio, just enable software mixer from playback options.

IMPORTANT
If used with Raspberry PI3, Wi-fi MUST be disabled (or use an external wi-fi dongle). Unfortunately the gate of the FETs ends up just above the wireless antenna, resulting in an audible noise when Wi-Fi is in use.

This thread will be the reference for technical discussions and help regarding this DAC.
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Re: The Pi2Design 503HTA Hybrid Tube DAC thread

Postby marcellom » Fri Nov 18 2016 18:28

Wow is available in the Volumio shop? How it sounds?
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Re: The Pi2Design 503HTA Hybrid Tube DAC thread

Postby michelangelo » Fri Nov 18 2016 19:01

marcellom wrote:Wow is available in the Volumio shop? How it sounds?


Yes, here it is:
https://volumio.org/product/pi2design-5 ... -tube-amp/

And here are my impressions:
https://volumio.org/tube-raspberry-pi-i2s-dac-finally/
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Re: The Pi2Design 503HTA Hybrid Tube DAC thread

Postby marcellom » Fri Nov 18 2016 20:37

thanks Michelangelo! Unfortunately is out of my budget... but seems very cool...
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The Pi2Design 503HTA Hybrid Tube DAC thread

Postby bowzee » Thu Nov 24 2016 23:08

I followed the (rather simple) instructions but was unable to make Volumio work with two different 503HTA boards. The main board is a Raspberry Pi 3. Everything seems to work including the GUI via browser and the ssh access and the tube lights up but there is no sound.

How do I debug this?
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The Pi2Design 503HTA Hybrid Tube DAC thread

Postby michelangelo » Fri Nov 25 2016 10:56

Dear Bowzee,
let's try the easy things first, then we'll see.
First: did you reboot after enabling the driver?
Second: turn the volume knob higher, that might be the thing
third: if you're using software mixer, please try to reboot or change to none
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The Pi2Design 503HTA Hybrid Tube DAC thread

Postby bowzee » Fri Nov 25 2016 14:52

Hi michelangelo,

- reboot after enabling the driver? -> yes
- turn the volume knob higher? -> yes
- using software mixer? -> no

Also I reinstalled the SD card from scratch (and followed the instructions), got the same results
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The Pi2Design 503HTA Hybrid Tube DAC thread

Postby michelangelo » Fri Nov 25 2016 16:39

bowzee wrote:Hi michelangelo,

- reboot after enabling the driver? -> yes
- turn the volume knob higher? -> yes
- using software mixer? -> no

Also I reinstalled the SD card from scratch (and followed the instructions), got the same results

Sorry If I still start from obvious stuff, but I can't understand why it should not work.

- Which PSU are you using? The one from PI2 design?
- Are you sure you did connect audio out to the right jack? Remember that one is for input and one for output...

Hope that Michael from PI2Design will jump in and help us
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The Pi2Design 503HTA Hybrid Tube DAC thread

Postby bowzee » Sat Nov 26 2016 16:22

Hi michelangelo,

The only thing that someone could call nonstandard, relatively speaking, is the Raspberry Pi 3 PSU, it says 2.5A on the label but the lightning icon shows up with Raspbian, which seems to be a rainbow square meaning the same with Volumio. If this is the problem I will have to go out and buy some more powerful PSU, like 5A or something.
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The Pi2Design 503HTA Hybrid Tube DAC thread

Postby michelangelo » Sun Nov 27 2016 15:20

When you see this rainbow square, it means that the raspberry pi is not receiving enough power.

Also, I understand where the problem is: with the 503HTA amp, you need to use a different power supply, it will not work by powering the pi with your ordinary power supply. This confirms my suspicions ;)

We've written this in the product page
This product requires an external 48W+ Power Supply to power the 503HTA Hat and the Pi. We recommend our 48W Universal Input 24V @ 2A supply, please select it from the menu under the price if interested. This supply requires a standard IEC input power cord. No cord is shipped with the supply.


So, if you did not buy this PSU (curiosity: did you get your 503HTA from Volumio Shop?) you should use a laptop PSU at 24V and at least 2A. I think that universal laptop power supplies could be your best bet in this case. Let me know how it goes.
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