Yes I have too separate transformers. How do I tell if they are in the same phase. Also, I don't know if it makes any difference but the B+ is a toroidal transformer while the filament transformer is a standard transformer. I did this because the current for the heaters for this amp totals 3 Amps.
In the Headwize schematic the 6as7 filament is connected to ground trough the middle of a variable resistor, nulling the current modulation in the amplifier ground, try doing the same. Otherwise you can leave the filament ground floating and connect it to the amplifier ground with a 0.1uF film capacitor.
If I am understanding your post, you have both the raw heater supply and the the heater regulator grounded. There should only be one connection to ground and my understanding of best practice is that it should be at the output of the regulator.
No, the AC Power Supply for the heater is not grounded at all. It is only connected to the rectifiers. The negative output of the full wave rectifier is grounded.
I should have wrote raw DC supply. Based on your regulator schematic you have a ground loop near your EI transformer if you ground both at the rectifier and at the regulator.
So what do you recommend? Should I separate the voltage regulator circuit so that it's ground is separate from the amplifier ground?
What I am saying is that you should only have one connection to ground just like your schematic shows. That ground should be at the output of the regulator. Can you post a picture of how it is wired?
now this is really driving me crazy. I had ordered and it arrived yesterday the following kit:
Nobsound 6N5P+6N11 Vacuum Tube Headphone Amplifier Board DIY KIT Single end Class A Amp|Amplifier| - AliExpress
This is roughly the equivalent of the headphone amp that I have been talking about with my issue with hum, unless I use batteries to power the filament.
So i put together the kit and guess what - it works perfectly with zero hum.
While the two amps are very close, there are a few minor differences. So my next step will be to identify the differences and make my home made one exactly the same and see if that fixes the hum.
One additional note, I am using the exact same transformers for the new one as I used for the old one.
Nobsound 6N5P+6N11 Vacuum Tube Headphone Amplifier Board DIY KIT Single end Class A Amp|Amplifier| - AliExpress
This is roughly the equivalent of the headphone amp that I have been talking about with my issue with hum, unless I use batteries to power the filament.
So i put together the kit and guess what - it works perfectly with zero hum.
While the two amps are very close, there are a few minor differences. So my next step will be to identify the differences and make my home made one exactly the same and see if that fixes the hum.
One additional note, I am using the exact same transformers for the new one as I used for the old one.
Question about Headphone Amp
now this is really driving me crazy. I had ordered and it arrived yesterday the following kit:
Nobsound 6N5P+6N11 Vacuum Tube Headphone Amplifier Board DIY KIT Single end Class A Amp|Amplifier| - AliExpress
This is roughly the equivalent of the headphone amp that I have been talking about with my issue with hum, unless I use batteries to power the filament.
So i put together the kit and guess what - it works perfectly with zero hum.
While the two amps are very close, there are a few minor differences. So my next step will be to identify the differences and make my home made one exactly the same and see if that fixes the hum.
One additional note, I am using the exact same transformers for the new one as I used for the old one.
now this is really driving me crazy. I had ordered and it arrived yesterday the following kit:
Nobsound 6N5P+6N11 Vacuum Tube Headphone Amplifier Board DIY KIT Single end Class A Amp|Amplifier| - AliExpress
This is roughly the equivalent of the headphone amp that I have been talking about with my issue with hum, unless I use batteries to power the filament.
So i put together the kit and guess what - it works perfectly with zero hum.
While the two amps are very close, there are a few minor differences. So my next step will be to identify the differences and make my home made one exactly the same and see if that fixes the hum.
One additional note, I am using the exact same transformers for the new one as I used for the old one.