Slope resistor and effects send level?

General discussion area for tube amps.

Moderators: pompeiisneaks, Colossal

67Mopar
Posts: 141
Joined: Tue Jun 04, 2013 5:02 am

Slope resistor and effects send level?

Post by 67Mopar »

....
Last edited by 67Mopar on Wed Jun 05, 2013 9:01 pm, edited 1 time in total.
Firestorm
Posts: 3033
Joined: Fri Jan 25, 2008 7:34 pm
Location: Connecticut

Re: Slope resistor and effects send level?

Post by Firestorm »

67Mopar wrote:My effects 'send' signal is 'hotter' than it was prior to changing a couple of R values?

The amp I'm working on has the tone-stack positioned just before the effects-loop 'send'. Could lowering the slope resistor from 47k to 43k increase the output to the effects send? Since the signal form the tone-stack is in-series with the effects loop send, would lowering the slope-resistor not increase output to the loop send? I also increased the PI cathode resistor from 410 Ohm's to 470 Ohm's... Anyone?
It will increase bass frequencies and decrease treble frequencies, but by an amount much too small to be perceptible. The PI cathode should not affect the loop.
67Mopar
Posts: 141
Joined: Tue Jun 04, 2013 5:02 am

Re: Slope resistor and effects send level?

Post by 67Mopar »

...
User avatar
xtian
Posts: 7263
Joined: Mon Apr 19, 2010 8:15 pm
Location: Chico, CA
Contact:

Re: Slope resistor and effects send level?

Post by xtian »

...


[I have decided to delete my posts before making them.]
I build and repair tube amps. http://amps.monkeymatic.com
vibratoking
Posts: 2640
Joined: Tue Nov 10, 2009 9:55 pm
Location: Colorado Springs, CO

Re: Slope resistor and effects send level?

Post by vibratoking »

And Firestorm gave such a considerate and informative answer. I don't get it.
User avatar
echuta13
Posts: 146
Joined: Sat Jan 05, 2008 6:55 am
Location: Rancho Cucamonga, CA

Re: Slope resistor and effects send level?

Post by echuta13 »

I'm starting to warm up to this guy. :lol:
If you can't be a good example, then you'll just have to be a horrible warning.
surfsup
Posts: 1513
Joined: Mon Nov 29, 2010 12:21 am
Location: Chicagoland

Re: Slope resistor and effects send level?

Post by surfsup »

Xtian funny...the new motto is to Quote all of 67Mopar's posts in yours so he can't delete his words.
User avatar
Structo
Posts: 15446
Joined: Wed Oct 17, 2007 1:01 am
Location: Oregon

Re: Slope resistor and effects send level?

Post by Structo »

So he waits until he gets an answer then deletes his posts?

Dude you need to grow thicker skin (insulator) to hang here.

This is a great group of guys that have a great sense of humor.

In between the wisecracks is very good advice. :lol:
Last edited by Structo on Tue Jun 11, 2013 6:11 pm, edited 1 time in total.
Tom

Don't let that smoke out!
67Mopar
Posts: 141
Joined: Tue Jun 04, 2013 5:02 am

Re: Slope resistor and effects send level?

Post by 67Mopar »

Firestorm wrote:
67Mopar wrote:My effects 'send' signal is 'hotter' than it was prior to changing a couple of R values?

The amp I'm working on has the tone-stack positioned just before the effects-loop 'send'. Could lowering the slope resistor from 47k to 43k increase the output to the effects send? Since the signal form the tone-stack is in-series with the effects loop send, would lowering the slope-resistor not increase output to the loop send? I also increased the PI cathode resistor from 410 Ohm's to 470 Ohm's... Anyone?
It will increase bass frequencies and decrease treble frequencies, but by an amount much too small to be perceptible. The PI cathode should not affect the loop.
Thanks! I'm going to experiment with 33k slope resistor, and .01 PI couplings. The t/s bass cap is .1 which is the highest I've seen for a 2204 inspired circuit. Marshall, Bogner, Soldano use .022uf as bass and mid. I have it dialed-in nicely now, but the bass is still a bit loose sounding.
User avatar
Leo_Gnardo
Posts: 2585
Joined: Thu Sep 27, 2012 1:33 pm
Location: Dogpatch-on-Hudson

Re: Slope resistor and effects send level?

Post by Leo_Gnardo »

67Mopar wrote:
Firestorm wrote:
67Mopar wrote:My effects 'send' signal is 'hotter' than it was prior to changing a couple of R values?

The amp I'm working on has the tone-stack positioned just before the effects-loop 'send'. Could lowering the slope resistor from 47k to 43k increase the output to the effects send? Since the signal form the tone-stack is in-series with the effects loop send, would lowering the slope-resistor not increase output to the loop send? I also increased the PI cathode resistor from 410 Ohm's to 470 Ohm's... Anyone?
It will increase bass frequencies and decrease treble frequencies, but by an amount much too small to be perceptible. The PI cathode should not affect the loop.
Thanks! I'm going to experiment with 33k slope resistor, and .01 PI couplings. The t/s bass cap is .1 which is the highest I've seen for a 2204 inspired circuit. Marshall, Bogner, Soldano use .022uf as bass and mid. I have it dialed-in nicely now, but the bass is still a bit loose sounding.
NOW you're really on to something! I would make one important suggestion you should try and that is

---
down technical blind alleys . . .
User avatar
M Fowler
Posts: 14036
Joined: Wed Jan 16, 2008 2:19 am
Location: Walcott ND

Re: Slope resistor and effects send level?

Post by M Fowler »

And adjusting the slope trimmer will......
User avatar
LeftyStrat
Posts: 3117
Joined: Fri Jan 14, 2005 6:58 pm
Location: Marietta, SC, but my heart and two of my kids are in Seattle, WA

Re: Slope resistor and effects send level?

Post by LeftyStrat »

67Mopar wrote:Help! I've fallen and can't get up!
You should have followed Mark's advice.

But now that you haven't the only way to get out of this situation is ...
It's never too late to have a happy childhood.
User avatar
Leo_Gnardo
Posts: 2585
Joined: Thu Sep 27, 2012 1:33 pm
Location: Dogpatch-on-Hudson

Re: Slope resistor and effects send level?

Post by Leo_Gnardo »

LeftyStrat wrote:
67Mopar wrote:Help! I've fallen and can't get up!
You should have followed Mark's advice.

But now that you haven't the only way to get out of this situation is ...
Pull my finger

- - -
down technical blind alleys . . .
User avatar
LeftyStrat
Posts: 3117
Joined: Fri Jan 14, 2005 6:58 pm
Location: Marietta, SC, but my heart and two of my kids are in Seattle, WA

Re: Slope resistor and effects send level?

Post by LeftyStrat »

Leo_Gnardo wrote: Pull my finger
LOL. Uncle Leo.
It's never too late to have a happy childhood.
67Mopar
Posts: 141
Joined: Tue Jun 04, 2013 5:02 am

Re: Slope resistor and effects send level?

Post by 67Mopar »

I have a stinky on the end of my pinky... Would you like to lick it off?
Last edited by 67Mopar on Sat Jun 08, 2013 5:50 pm, edited 2 times in total.
Post Reply