Since you don't have the terminal blocks installed, you've got 6 holes on each side of ground. I'd choose one side and go for it.
Just to confirm:
1. Tie all of the center 0v pads together.
2. Land the left channel 0v, right channel 0v, and the thermistor lifted 0v on three adjacent pads.
Does this plan sound good?
1. Tie all of the center 0v pads together.
2. Land the left channel 0v, right channel 0v, and the thermistor lifted 0v on three adjacent pads.
Does this plan sound good?
The one thing that stumped me on the M2 build was hum
After organising the earth to a star earth configuration, this resulted in a slight reduction in hum
This was suggested to me as a logical next step, and that was to romove the toroidal out of the chassis and hook it up via long wires
Doing this was a successful test as the hum vanished
So I ordered a different brand toroidal with an RF shield band an installed it
Now I have silence - a church mouse is louder
After organising the earth to a star earth configuration, this resulted in a slight reduction in hum
This was suggested to me as a logical next step, and that was to romove the toroidal out of the chassis and hook it up via long wires
Doing this was a successful test as the hum vanished
So I ordered a different brand toroidal with an RF shield band an installed it
Now I have silence - a church mouse is louder
Then star earth is your next step
I started off with the drawing on the left first
The drawing on the right is the star earth scheme that I use now
Hope it helps
I started off with the drawing on the left first
The drawing on the right is the star earth scheme that I use now
Hope it helps
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Probably not... If you want to cover all bases, send the RCA grounds to the same place as the rest on the PSU board. Just run the signal wire to the amp PCB.
You are using shielded coax? How are you grounding the shield?
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Alvin - The shield is landed on both ends, you can see it pretty clearly in one of the pictures I posted.
Jim - I tied all the center pads together and moved the right channel ground and the thermistor lifted ground to the pads next to the leftt channel ground. I powered up and the hum is gone! I think I'll leave the input shields as is.
Thanks to everyone for all your help, time to listen to the music!😀
Thanks Nelson for sharing with and supporting the community.
I've also attached a picture of where I started at yesterday morning. It's amazing what one can finish in a weekend when the wife is gone...
Jim - I tied all the center pads together and moved the right channel ground and the thermistor lifted ground to the pads next to the leftt channel ground. I powered up and the hum is gone! I think I'll leave the input shields as is.
Thanks to everyone for all your help, time to listen to the music!😀
Thanks Nelson for sharing with and supporting the community.
I've also attached a picture of where I started at yesterday morning. It's amazing what one can finish in a weekend when the wife is gone...
Attachments
Congratulations PDL. Very nice build and I'm happy the hum has been resolved.
Now it's time to enjoy the music... 🙂
Cheers,
Dennis
Now it's time to enjoy the music... 🙂
Cheers,
Dennis
The speakers are Madisound's BK-12m. They seem to pair very well with the amp. The speakers use Fostex FE126En full range drivers.
What are your suggestions for speakers that are worthy?
I use Jericho horn speakers (FE206 driver)
so possibly a big brother to your Madisound and they sound good to my ears.
They do however need a LOT of running in before they settle down.
so possibly a big brother to your Madisound and they sound good to my ears.
They do however need a LOT of running in before they settle down.
+1 for Jericho horns !
Mine have the original (vintage) FE208 Sigma.
Have not tried them with an F6, actually, but they work great with SE 2A3 tube amp, souped-up Aleph Mini, and vintage Sony VFET amp ...
At 100 dB/W sensitivity, not just loud, but delicate sounding as well ... 😉
Best regards,
Claas
Mine have the original (vintage) FE208 Sigma.
Have not tried them with an F6, actually, but they work great with SE 2A3 tube amp, souped-up Aleph Mini, and vintage Sony VFET amp ...
At 100 dB/W sensitivity, not just loud, but delicate sounding as well ... 😉
Best regards,
Claas
Why Nelson Pass do not use in his First Watt amplifer series, speaker protection circuts?
How he can not afraid that, in one moment amplifer can burn precious speakers.
Yes i do not have much skills to understand whole schematic, but someone can explain?
How he can not afraid that, in one moment amplifer can burn precious speakers.
Yes i do not have much skills to understand whole schematic, but someone can explain?
these amps are reliable .
however , if you make your own , nothing stops you from including speaker protection modules
however , if you make your own , nothing stops you from including speaker protection modules
So not need to worry that amplifer can burn my speaker coils? Can i sleep in peace of mind with my Diy F6? 😱 Thank you