8 Channel, 3U NEVE 1073 completed

[zachs]

Just want to say this thread/project is still 100/100. So impressive.

 

[inf0]

Hey there ! I'm working on a variation of this project and wanted to do the modification of the Decoupling & Output capacitor value increase as well.
Could anyone guide me as to which were the original values and to what they were increased to?

Is there any further adjustment that's gonna be needed if I increase those capacitor values?

Thank you !

 

[MidnightArrakis]

>> Why is -- R6 -- shown as being a capacitor? Is this an "OOPS"??? Or, some kind of "secret MOJO" modification???.....


/

 

[MathCantin]

>> Why is -- R6 -- shown as being a capacitor? Is this an "OOPS"??? Or, some kind of "secret MOJO" modification???.....

View attachment 140783
/

This is a big oops on the silkscreen! This is C7 and R6 is the resistor just behind The trace appears to be the same as an usual B283

 

[inf0]

Silly question, when measuring the transistors for voltages , where do I connect the other probe? ( chassis or audio ground? )

Thank you

 

[allergies.for.all]

Look amazing!

 

[inf0]

I run into some issues with sound passing but very low level and distorted. I have to max out the gain to even get a bit of signal
I've tried reflowing all solder joints and checked values / cap orientation for any obvious mistakes but everything seems to be correct.
2N3055 biased to 22.66V

I've taken some measurements from the transistors and it seems that 2 transistors don't match the reference measurements in the guide.
I've replaced TR4 to see if it would make a difference but still get the same readings.



Any suggestions on how to methodically troubleshoot the unit so I can pin point the issue?

Thank you!

 

[Potato Cakes]

Inject signal at the input. Take a multimeter and find where the signal stops.

Thanks!

Paul

 

[inf0]

I just realized I've ordered a 1/4 270R resistor when the BOM states it should be 1W , is there going to be an issue if I keep the 1/4w? The only ones I could find in 1W are carbon film but I'm not sure if it might increase noise/distortion ( never used them before and I keep reading about how noisy they are )

Thank you

 

[thelivingroom]

I just realized I've ordered a 1/4 270R resistor when the BOM states it should be 1W , is there going to be an issue if I keep the 1/4w? The only ones I could find in 1W are carbon film but I'm not sure if it might increase noise/distortion ( never used them before and I keep reading about how noisy they are )

Thank you

I just checked Mouser, and they have several 1W 270R in metal film, from Yageo, TE, and Vishay. I wouldn’t use 1/4W where a 1W is specified.

 

[inf0]

I just checked Mouser, and they have several 1W 270R in metal film, from Yageo, TE, and Vishay. I wouldn’t use 1/4W where a 1W is specified.

Appreciate the feedback! Do you think if I use carbon film , there is going to be a difference in noise? It's gonna be a bit expensive to order just 1 resistor from mouser

Thank you!

 

[Whoops]

I just realized I've ordered a 1/4 270R resistor when the BOM states it should be 1W , is there going to be an issue if I keep the 1/4w?

If the BOM says "1W" then that's exactly what you should use, the BOM exists to you don't have to second guess, you just have to follow it.
If you start changing components from the specs in the BOM at you own will then it's normal in the end that you don't have the proper voltages or have problems in your build

Appreciate the feedback! Do you think if I use carbon film

For sure, no problems with that.
"Carbon Film" are very good, just "carbon composition" have pretty low specs and many problems

Original Neve cards used Carbon Film

there is going to be a difference in noise?

No.
The difference will not be even measurable with test gear

 

[inf0]

Thank you @Whoops ! I followed the BOM to the t , even went with military resistors for the sake of double checking the values visually !

The 1w somehow slipped through. I'll get the carbon film 1w!

Thanks !

 

[MidnightArrakis]

Thank you @Whoops ! I followed the BOM to the t , even went with military resistors for the sake of double checking the values visually !

The 1w somehow slipped through. I'll get the carbon film 1w!

Thanks !

[I'll get the carbon film 1w!] -- "Metal-Film" will be even better and there is basically no price difference than that of "Carbon-Film". Metal-Film resistors will have even lower noise.

Carbon-Film: Mouser #: 660-SPR1CT52R271J = $0.32 each

Metal-Film: Mouser #: 594-PR01000102700FA5 = $0.46 each

/