FDP - Forum

FDP Home Page / FDP Forum / Classifieds / FAQ's / Links / Cookbook

The FDP is made possible by the following companies and individual members like you.
Please use the links below to show them we value their sponsorship.

Antique Electronics Supply
Guitar Center
WD Music
www.thetubestore.com

MOD KITS DIY
Jensen Loudspeakers
Amazon
Sweetwater

TTS Music
Musician's Friend
Contact Us!
Bill Lawrence Pickups

Amplified Parts
The Music Zoo

* God bless America and our men and women in uniform *
* Illegitimi non carborundum! *
If you benefit and learn from the FDP and enjoy our site, please help support us and become a Contributing Member or make a Donation today! The FDP counts on YOU to help keep the site going with an annual contribution. It's quick and easy with PayPal. Please do it TODAY!
Chris Greene, Host & Founder
Registered Members: 64,000+
LOST YOUR PASSWORD?
......................................................................

IF YOU CANNOT LOG IN, RESET YOUR PASSWORD.

For Sale/Wanted Classifieds

FDP Jam
Calendar

Find musicians
in your area!

Search the Forums

FDP Forum / Amp Mods, Repairs, and Projects / How to wire a DPDT switch to bypass the NFB resistor

earSmoke

USA

May 22nd, 2012 01:54 PM Edit Profile Print Topic Search Topic
Hello,

I have a Fender Champion 600 that I am in the process of modding. This is a nice little amp with a lot of potential. Have already swapped the tubes, speaker and grill cloth. The first circuit mod was to remove the Negative Feedback Loop by removing R7 (2.2k). I could stop here because the amp really comes alive now! Great amp for my Les Paul Jr w/P90!

The next baby step is to replace R7 with a 22k but want to be able to bypass R7 altogether or have R7 in the circuit. This seems simple enough but I cannot find how to wire this properly. I've researched but couldn't find any resource that showed how this is done.

Would someone please show me how to do the wiring? You can start off with which end of R7 do you lift for the wiring? The DPDT switch is a simple On-Off with 6 poles for the wiring. I would like the On position to be up with the NFL engage.

Any help would be most appreciatiated!

regards,
Robert

SteavisSmokin

Netherlands

the blues hides in the strangest places
May 22nd, 2012 02:16 PM Edit Profile Print Topic Search Topic
if you want to switch between no NFB or a 22K NFB resistor you don't even need a DPDT switch, a standard SPST will do. Pull one end of the resistor from the circuit board, floating end of the resistor goes to one lead of the switch,the other lead of the switch goes back to the board to where the resistor would have been soldered if it weren't floating.. (uh..hope I'm clear haha).

*editted to correct typos
(This message was last edited by SteavisSmokin at 03:30 PM, May 22nd, 2012)

Peegoo
Contributing Member
**********
**********

That chicken

is WRONG, baby.
May 22nd, 2012 02:57 PM Edit Profile Print Topic Search Topic
Yep. That's how.

earSmoke

USA

May 22nd, 2012 04:02 PM Edit Profile Print Topic Search Topic
I know, I'm an idiot and was over thinking this whole thing.

Thank you!

Riverside
Contributing Member
***

SoCal

May 22nd, 2012 04:32 PM Edit Profile Print Topic Search Topic
Futz in a pot, and you'll have a "Presence" control.

FDP Forum / Amp Mods, Repairs, and Projects / How to wire a DPDT switch to bypass the NFB resistor

Reply to this Topic
	Display my email address Lost your password?
Your Message:
Link Address (URL):
Link Title:

Antique Electronics Supply	Guitar Center	WD Music	www.thetubestore.com
MOD KITS DIY	Jensen Loudspeakers	Amazon	Sweetwater
TTS Music	Musician's Friend	Contact Us!	Bill Lawrence Pickups
Amplified Parts	The Music Zoo

	For Sale/Wanted Classifieds
FDP Jam Calendar		Find musicians in your area!
	Search the Forums