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FDP Forum / Fender Amps: 1985 - Current / Can't select "more drive" with the footswitch on my HRD....

mcq

North of Bean Town

JAFO guitarist
Jul 16th, 2012 02:05 AM Edit Profile Print Topic Search Topic

Tried a 2nd known good footswitch same results but I can select it from the pushbutton on the front panel when the footswitch is removed.

Is this a problem with the jack or does this drive a relay and the problem lies there?

McQ

willie
Contributing Member
****

Walton County, GA.

Half a century of guitar and amp service
Jul 16th, 2012 09:01 AM Edit Profile Print Topic Search Topic
Your problem is most likely a bad JFET, Q1,Q2 or both. J111 JFETS, very common swithching snafu in these amps.

willie
musicmenders.com

telegib

Canada

Jul 16th, 2012 08:05 PM Edit Profile Print Topic Search Topic
I wish Fender would put more higher quality components in the HRD. They really are great sounding amps. In fact the HRD is my favorite of my tube amps for making any guitar sound good.

willie
Contributing Member
****

Walton County, GA.

Half a century of guitar and amp service
Jul 16th, 2012 08:30 PM Edit Profile Print Topic Search Topic
Fact is, this problem is common to most every production amp I can think of that uses relays to switch channels or boost or drive or what ever.

willie
musicmenders.com

mcq

North of Bean Town

JAFO guitarist
Jul 17th, 2012 12:19 PM Edit Profile Print Topic Search Topic

Thanks, willie.

I finally got a copy of the correct schematic. I'll follow the circuit up to the FET's and see what's going on.

Not sure why I was thinking the jack..., must have been the trying to think late at night!

Kevin

FDP Forum / Fender Amps: 1985 - Current / Can't select "more drive" with the footswitch on my HRD....

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