Eros 2 schematic and manual

[feras]

I assembled Eros2. It works fine. I noticed 1 mismatch between the provided schematic (page 7 manual) and provided assembly instructions. In the schematic EF86 point A6/B6 is connected to C4S OB point and resistor 90R9 which goes to 7308's C2/C7.

In the instruction manual a 90R( resistor is connected between A6/B6 and 9/10 or 14/5. From 9/10 and 14/15 is connection to C4S and trough one more 90R9 resistor to C2/C7.
In the schematic option signal goes from EF86 to 7308 though one 90R9, but according to the assembly instructions via 2 resistors.

Which option is correct? I tried both and have no preference for sound.

Thanks

 

[Paul Birkeland]

In the schematic EF86 point A6/B6 is connected to C4S OB point and resistor 90R9 which goes to 7308's C2/C7.

In the instruction manual a 90R( resistor is connected between A6/B6 and 9/10 or 14/5. From 9/10 and 14/15 is connection to C4S and trough one more 90R9 resistor to C2/C7.

The manual does not have the plate stoppers for the EF86 because they are not absolutely necessary.  They are certainly not harmful, and since they made the build a bit easier to do, we opted to include them.

Which option is correct? I tried both and have no preference for sound.

It's very unlikely that you'll hear any difference between the configurations.  I would leave them in personally, but then again I'm the one who put them there in the first place...

 

[feras]

Thank you for the response.

 

[grufti]

Theoretically those resistors add a tiny bit of noise, but I have them in my Eros 2 also.

 

[Paul Birkeland]

Theoretically those resistors add a tiny bit of noise

Or they prevent a tiny bit of oscillation