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low output on I/V transformer stage with ES9028Q2M #11

Open SolderStijn opened 10 months ago

SolderStijn commented 10 months ago

Hey Anybody can help me out on this...

I bought the I/V transformer stage with 1544a Lundahls for the ES9028Q2m DAC hat (using Volumio). Output volume is very low when feeding valve amps (input impedance 90K or so), the amp does however have a 100K volume pot as at the input (hard to drive passively?). The VU meter hardly moves while my Phono stage makes the VU move considerably. It seems that volume is also low when feeding the line input of a separate sound card. Previously I used a valve output stage with the DAC (ECC83 with voltage gain of nearly 100) and the output volume was good/decent.

I have desoldered the transformers from the board and tried to use the complete winding ratio of 1:4 winding for the RCA (instead of 1:4 for XLR and 1:2 for RCA). Also have experimented with various combinations of primary and secondary resistors to increase voltage or to decrease output impedance.

Does this I/V suppose to deliver the standard 2V of line level voltage? or is additional pre-amp required? Or is there maybe an issue with a DAC setting that prevents full output volume? Also considering that the valve stage needed to be a mu100 valve to give decent voltage and this transformer is only a 1:4 winding ratio....

Thanks,

Regards Stijn

iancanada commented 10 months ago

The output levels are standard 2V RMS p-p Did you turn the DAC controller to 0dB?

On Mon, Jan 22, 2024 at 5:02 PM SolderStijn @.***> wrote:

Hey Anybody can help me out on this...

I bought the I/V transformer stage with 1544a Lundahls for the ES9028Q2m DAC hat (using Volumio). Output volume is very low when feeding valve amps (input impedance 90K or so), the amp does however have a 100K volume pot as at the input (hard to drive passively?). The VU meter hardly moves while my Phono stage makes the VU move considerably. It seems that volume is also low when feeding the line input of a separate sound card. Previously I used a valve output stage with the DAC (ECC83 with voltage gain of nearly 100) and the output volume was good/decent.

I have desoldered the transformers from the board and tried to use the complete winding ratio of 1:4 winding for the RCA (instead of 1:4 for XLR and 1:2 for RCA). Also have experimented with various combinations of primary and secondary resistors to increase voltage or to decrease output impedance.

Does this I/V suppose to deliver the standard 2V of line level voltage? or is additional pre-amp required? Or is there maybe an issue with a DAC setting that prevents full output volume? Also considering that the valve stage needed to be a mu100 valve to give decent voltage and this transformer is only a 1:4 winding ratio....

Thanks,

Regards Stijn

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SolderStijn commented 10 months ago

Is this required with the ESS controller or can this be done differently? For example in the Volumio terminal or so?

iancanada commented 10 months ago

My DAC always needs a controller, either a MonitorPiPro or a ESS controller

On Mon, Jan 22, 2024 at 5:11 PM SolderStijn @.***> wrote:

Is this required with the ESS controller or can this be done differently? For example in the Volumio terminal or so?

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SolderStijn commented 10 months ago

Ahh Okay I miss interpreted the documentation. So this is definitely the issue probably? Would have saved me quite some tinkering. The manual says settings can be controlled by external ESS-controler or by Linux driver. Is the software route possible with Volumio or is the ESS-controler a better route?

iancanada commented 10 months ago

No Linux driver is available so far because of the NDA of ESS

On Mon, Jan 22, 2024 at 5:21 PM SolderStijn @.***> wrote:

Ahh Okay I miss interpreted the documentation. So this is definitely the issue probably? Would have saved me quite some tinkering. The manual says settings can be controlled by external ESS-controler or by Linux driver. Is the software route possible with Volumio or is the ESS-controler a better route?

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SolderStijn commented 10 months ago

Okay thanks for the information, I will buy an ess-controller, Hopefully I am pleasantly surprised by a full and rich sound.

iancanada commented 10 months ago

BTW, can you please send me a picture showing your system so that I can confirm what you will need.

Thanks Ian

On Mon, Jan 22, 2024 at 5:28 PM SolderStijn @.***> wrote:

Okay thanks for the information, I will buy an ess-controller, Hopefully I am pleasantly surprised by a full and rich sound.

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SolderStijn commented 10 months ago

Btw, do you have any additional recommendations or thoughts on loading resistors (primary and secondary)? Some circuits use these, but yours only has the 510 ohm primary resistor and no R on the secondary. Will this change if I wire the 2 secondary windings in series for the RCA output? or does this change because of the input impedance of the amp in combination with the turn ratio?

iancanada commented 10 months ago

The I/V resistors are correct. Do you have an ESS controller or a MonitorPi Pro now? You have changed the volume to 0dB so that you can get the normal sound level.

Ian

On Tue, Jan 23, 2024 at 2:54 AM SolderStijn @.***> wrote:

Btw, do you have any additional recommendations or thoughts on loading resistors (primary and secondary)? Some circuits use these, but yours only has the 510 ohm primary resistor and no R on the secondary. Will this change if I wire the 2 secondary windings in series for the RCA output? or does this change because of the input impedance of the amp in combination with the turn ratio?

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SolderStijn commented 10 months ago

Hello Ian, thanks for the quick reply, very much appreciated. I will order a MonitorPi pro and do the needed ess adjustments to 0db. Think this will likely resolve the issue, but we shall see.

iancanada commented 10 months ago

OK

On Tue, Jan 23, 2024 at 1:20 PM SolderStijn @.***> wrote:

Hello Ian, thanks for the quick reply, very much appreciated. I will order a MonitorPi pro and do the needed ess adjustments to 0db. Think this will likely resolve the issue, but we shall see.

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SolderStijn commented 10 months ago

€100 later and with a Monitor PI Pro it now works! sounds great, thanks for the quick support!

iancanada commented 10 months ago

Thank you for the update. I'm glad you made it. Enjoy the music and let me know at any time if there is anything I can do to help

Regards, Ian

On Tue, Jan 30, 2024 at 3:50 AM SolderStijn @.***> wrote:

€100 later and with a Monitor PI Pro it now works! sounds great, thanks for the quick support!

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