Tweed Tweedy BluesMeister BluezMeister presence control

[wolfiesays]

Hello,

First post here! Decided to tackle a quarantine build for an amp based on what tubenit and dageezer contributed. I was going to put an active fx, but ran out of space.

I noticed this has a fixed nfb and no presence control. I wanted to tap in and add a presence control but really do not know how to implement it here. Is this a typical Fender "presence" or will I use a Marshall or TW style? I have an extra hole on my faceplate lol. This is my first build but have done a bunch of research and went with the attached setup for board layout, see pics. I am using geezer's original layout with a 47R not the 60R resistor.

So to get a useable "presence" pot and resistor value what should I go with? and where should I tap into the "tail" of the phase inverter?
I want to run 4 8ohm speakers series/parallel at 8ohms, I will be using a multitap 60W hammond 1650N OT, if this affects the resistors in the nfb (not sure), I am also using a 1971 sup rev PT, non super linear which I assume is 330-0-330.

Go easy on me guys haha.

-wolfie

[tubenit]

I think this should work fine for you.  I use this on one of my amps.

With respect, Tubenit

[Latole]

Tubenit I have this presence control in one of my amps, a Lifco 1000. First time I see this.
It work great, sound is beautiful.
They call it High Range expender
Pot is a 25k L capacitor is a 0.12 mfd and resistor is a 4.7 k

[sluckey]

Tubenit I have this presence control in one of my amps, a Lifco 1000. First time I see this.
It work great, sound is beautiful.
They call it High Range expender
Pot is a 25k L capacitor is a 0.12 mfd and resistor is a 4.7 k

That's the same as the Marshall JCM-800 2204 amp...

     https://el34world.com/charts/Schematics/files/Marshall/Marshall_jcm800_2204_lead_series.pdf

[PRR]

>> I have this presence control
> That's the same as...

And really no different from Fender 5F6a presence except without DC in the pot wiper.

How "beautiful" it works may depend also on the speaker and player.

[2deaf]

Tubenit I have this presence control in one of my amps, a Lifco 1000. First time I see this.
It work great, sound is beautiful.
They call it High Range expender
Pot is a 25k L capacitor is a 0.12 mfd and resistor is a 4.7 k

Pete called it a High Range Expander on amps like the Bass Master.  It bears a striking resemblance to Fender's 6G6 Bassman.

[wolfiesays]

I think this should work fine for you.  I use this on one of my amps.

With respect, Tubenit

Thank you Tubenit, this looks great. I will experiment with different values if needed but will start with what you provided.

I will make sure to wire it up the way you put it here too. I like the simplicity of it.

Thank you!

wolfie