Parallel effects loop for Marshall style amps

[novosibir]

You then have two 22n caps in series, Larry?

If the Master is dimed - yes! With a 1Meg to ground from between the .022's

Larry

[erigm]

You then have two 22n caps in series, Larry?

yeah, but that's not really different from most amps. you come right from you tone caps into the PI cap, right? And most amps with fx loops do the same thing as Larry is suggesting. I for one vote to have the master after the loop as well.

[emartine]

You then have two 22n caps in series, Larry?

If the Master is dimed - yes! With a 1Meg to ground from between the .022's

Larry

Alright then! Thanks both of you.
Andrés Martinelli

[flemingmras]

You then have two 22n caps in series, Larry?

yeah, but that's not really different from most amps. you come right from you tone caps into the PI cap, right? And most amps with fx loops do the same thing as Larry is suggesting. I for one vote to have the master after the loop as well.

For proper gain structure that's the only place it belongs! This way your master controls the volume of the whole package with the effects already mixed in...not change the drive signal to the effects as doing it this way would alter the way the effects interact with the signal depending on where you have the master set.

[Tone Junkie]

Larry any chance I could get your loop . thanks Bill
at (jadesource@comcast.net)

[mkdivine]

i'd like to know if this loop would work for my matamp gt1.
unfortunately, there are no shematics of the matamp gt1 available..
im looking for a solution since ages... i tried the kleinulator but i disliked how it changed my tone.
would a gut shot of my amp help?

[emartine]

Larry: "When you try the Master after the loop section, don't forget the additional coupling cap! one .022 from the recovery stage's plate to the Master and another .022 to the PI's input."
Emartine: "You then have two 22n caps in series, Larry? :s"
Larry: "If the Master is dimed - yes! With a 1Meg to ground from between the .022's"

And if I choose to have the DPDT version as well, I would have three 22n caps round there. Am I right?

Im really into building this thing now that I finished college.
Thanks Larry!

[emartine]

Larry, are you still there??? :s

[novosibir]

Larry, are you still there??? :s

Don't worry!

I hear ya!
I see ya!
I even can smell ya!

But I can't always reply to all and everything

Larry

[emartine]

Larry, are you still there??? :s

Don't worry!

I hear ya!
I see ya!
I even can smell ya!

But I can't always reply to all and everything

Larry

Ok, Larry. If you get a chance later, I would be very grateful if you could clarify that doubt I have.
Thanks!

[novosibir]

Larry: "When you try the Master after the loop section, don't forget the additional coupling cap! one .022 from the recovery stage's plate to the Master and another .022 to the PI's input."
Emartine: "You then have two 22n caps in series, Larry? :s"
Larry: "If the Master is dimed - yes! With a 1Meg to ground from between the .022's"

And if I choose to have the DPDT version as well, I would have three 22n caps round there. Am I right?

Correct!

1st from the bypass path to the Master's input
2nd from the loop's recovery stage also to the Master's input
3th from the Master's wiper to the PI's input

If you'd like to go 'advanced', then include the Master into the PI's grid-cathode-network and safe the one .022 from the wiper to the tube's grid. Confused now?

Simply remove the upper 1M resistor with a 1M pot, where the wiper goes directly to the upper tube's grid.
Then you only have the two .022's to the Master's input

Keep in mind, that in this case the Master isn't referenced to ground!
The Master's ground lug in this case is connected there, where the remaining 1M, the 470 and the 10K are connected together.

Larry

[emartine]

Larry: "When you try the Master after the loop section, don't forget the additional coupling cap! one .022 from the recovery stage's plate to the Master and another .022 to the PI's input."
Emartine: "You then have two 22n caps in series, Larry? :s"
Larry: "If the Master is dimed - yes! With a 1Meg to ground from between the .022's"

And if I choose to have the DPDT version as well, I would have three 22n caps round there. Am I right?

Correct!

1st from the bypass path to the Master's input
2nd from the loop's recovery stage also to the Master's input
3th from the Master's wiper to the PI's input

If you'd like to go 'advanced', then include the Master into the PI's grid-cathode-network and safe the one .022 from the wiper to the tube's grid. Confused now?

Simply remove the upper 1M resistor with a 1M pot, where the wiper goes directly to the upper tube's grid.
Then you only have the two .022's to the Master's input

Keep in mind, that in this case the Master isn't referenced to ground!
The Master's ground lug in this case is connected there, where the remaining 1M, the 470 and the 10K are connected together.

Larry

Thanks, Larry.
Ill think Ill make the simpler version.

[emartine]

My last question from now is if the 82k + 100k conjuntion from the PI is a good place to solder the Uc (4k7)..
Thanks once again!!

[novosibir]

Yes!
This even is the best point, to take off the supply voltage.

Larry

[axeman]

Welcome back Larry.