switching the slope and mid cap

[hans-jörg]

I want put a switch between the original 150k/0,01 and a 100k/0,047 couple. I expect a better adapting to humbucker or SC.
Am I on the right way?
Is there to expect a popping while switching?
Whats your suggestion?

Hans-Jörg

[heisthl]

you should try having 2 slope resistors and 2 mid caps and then switch the output from the caps. Switching the high voltage on a slope resistor is not practical.
Just leave the bass cap connected to the slope value you like best for the bass controls response.

[hans-jörg]

Hi,
so I should not switch a second slope parallel with a second cap but find out wich slope I like and switch only the cap on the pot side?
I would put both parallel. A 0.033 cap and some Ks on the slope to come down to 100K (i have to check my calculator).
But I could switch both when amp is out (standby) than go back. Thats a possibility to switch both, right? I am shure I dont want switch them during action because of high voltage.
So in this case I can forget my question about popping.
Hans-Jörg

[Structo]

Something I did on my D'lite amp was to have switchable mid caps.

[img:189:703]https://lh5.googleusercontent.com/_MHnI ... od%201.JPG[/img]

When the switch is open the .01uf cap is the mid cap.
When the switch is closed the .01uf and .05uf cap are paralleled for a .06uf total.

[ChrisM]

I really like big mid caps for single coils (all I really play).

[hans-jörg]

Something I did on my D'lite amp was to have switchable mid caps.

[img:189:703]https://lh5.googleusercontent.com/_MHnI ... od%201.JPG[/img]

When the switch is open the .01uf cap is the mid cap.
When the switch is closed the .01uf and .05uf cap are paralleled for a .06uf total.

Hi Tom,
thats the way I wanted try. Thanks for giving me right.
About slope: I`m happy with the response of Bass, so better to leave it?
But only mid cap.

Hans-Jörg

[Firestorm]

In a slightly different vein: some of Mike Holland's amps had a Sweep control, a variable slope resistor, designed as way to match tone stack frequency response to different pickups. He blocked DC first with a large cap -- maybe .047 or .1 -- then set up the tone stack as usual, except the slope resistor was a pot. Kind of interesting.

[hans-jörg]

He blocked DC first with a large cap -- maybe .047 or .1 -- then set up the tone stack as usual,

Hi,
this part I dont understand exactly, maybe because of my poor skills.
Is there any scratch or schema about?

Thanks

Hans-Jörg

[bluesfendermanblues]

Have a look of the schemo of an old 1981 Marshall amp: http://www.drtube.com/schematics/marshall/2000pre2.gif

Here you can see the slope pot implemented, but without the DC blocking cap as mentioned above by 'Firestorm' - if you don't put in an extra cap you will get a lot of DC-related scratching noise when you turn the pot with the amp 'on'.

[hans-jörg]

Have a look of the schemo of an old 1981 Marshall amp: http://www.drtube.com/schematics/marshall/2000pre2.gif

Here you can see the slope pot implemented, but without the DC blocking cap as mentioned above by 'Firestorm' - if you don't put in an extra cap you will get a lot of DC-related scratching noise when you turn the pot with the amp 'on'.

Hi,
yes thats the problem. What I dont know is where to put the cap

Hans-Jörg

[John_P_WI]

Put it between the plate and tone stack. Just like any other coupling cap on a "normal" gain stage.

[hans-jörg]

Ah, ok,
like instaed of the 10k which is on the schema above.
Would`nt it be evan better to put a 47k in front of the poti (100k). So the lowest dail is 47k and the highest aproximatly 150k?

Does anybody of you build his D with this mod?

Thanks
Hans Jörg

[John_P_WI]

On the scheme above, it would go between the plate and the junction of the 10k resistor and C27 cap. The 10k is used in this case to set "minimum" resistance when the pot is fully rotated to its minimum setting.

[hans-jörg]

On the scheme above, it would go between the plate and the junction of the 10k resistor and C27 cap. The 10k is used in this case to set "minimum" resistance when the pot is fully rotated to its minimum setting.

ok, so mine 47k from above.

Thank you, I will give it a chance.

Best

Hans-Jörg

[bluesfendermanblues]

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