Friedman SS loop question.

[psychepool]

I would like to install a Friedman-style SS Loop on the amp I'm making.
While looking at the schematic for the build, I noticed some differences between the circuit of the BE-100/50deluxe and the Ceriatone clone.

Below is the schematic of BE-50 Deluxe and the layout of Ceriatone clone.
There is a difference at the point marked by the red box.

ssloop_01.jpg

If draw the layout of Ceriaton with a schematic diagram, it is as follows.

ssloop_02.jpg

Which one is the correct one?

[Stevem]

First off let me ask why you want a effects loop in your build and also if you plan on inserting any time based effects like reverb, chours or echo into the loop?

[pdf64]

I don’t see it as being a substantial / significant difference.
With the first, the 10pF stability cap only comes fully into play when the ‘send’ level control is set to max.
With the second, it’s always in play but the resulting corner freq will be so high as to be, in regard of audio, neither here nor there.

[psychepool]

First off let me ask why you want a effects loop in your build and also if you plan on inserting any time based effects like reverb, chours or echo into the loop?

I would like to install it for ordinary reasons.
Since the amp I'm making is a high-gain amp, so it's not a good idea to connect delays or reverbs to the inputs.

Of course, I don't intend to include the effects in the loop.
I'm thinking of connecting it externally through the send/return jack.

I don’t see it as being a substantial / significant difference.
With the first, the 10pF stability cap only comes fully into play when the ‘send’ level control is set to max.
With the second, it’s always in play but the resulting corner freq will be so high as to be, in regard of audio, neither here nor there.

Other than the 10pF cap, the Friedman circuit diagram is a configuration in which the resistance of the line from the coupling cap to the send jack increases as the feedback input to the gate increases by adjusting the trimmer. (Use all 3 pins of 50K)
However, in the Ceriatone version of the circuit, pins 1 and 2 of the trimmer are connected, so adjusting the trimmer simply increases the feedback to the gate.

Isn't this also a factor that makes a difference?

[pdf64]

... the Friedman circuit diagram is a configuration in which the resistance of the line from the coupling cap to the send jack increases as the feedback input to the gate increases by adjusting the trimmer...

Sorry but I don’t think you’re looking at it correctly.
The 470nF coupling cap connects directly between the FET and the send jack.

[Stevem]

My concern is for you to know that time delay based effects run thru the loop sound like pure crap if your using the amp in such a way that the output stage is adding distortion and clipping into the mix.

[psychepool]

... the Friedman circuit diagram is a configuration in which the resistance of the line from the coupling cap to the send jack increases as the feedback input to the gate increases by adjusting the trimmer...

Sorry but I don’t think you’re looking at it correctly.
The 470nF coupling cap connects directly between the FET and the send jack.

Oh, you are right. It's my mistake.
Then, in the Friedman circuit, the 50K 1,2-pin and 10pF capacitors seem to have no function. Is there a special role for them?
As you said, 10pF is too small to act as a filter, so it doesn't has special role even if connect it like a Ceriatone layout.
Is there really no difference between the two circuits?

My concern is for you to know that time delay based effects run thru the loop sound like pure crap if your using the amp in such a way that the output stage is adding distortion and clipping into the mix.

The amp that I build is a Mesa Rectifier-based amplifier.
If your concern is about attaching an FX loop to an amp that needs power amp crank-up,
I don't think it's a bad choice to have an FX loop like this type of amp because cranking up the poweramp is not the main purpose of it.
Am I rightly understanding your opinion?