Fender Princeton Chorus Input Jacks

01 The Patient

This solid-state Fender Princeton Chorus is an awesome little amp, but the input jacks were worn out.  A call came into the Galactic Headquarters of Unbrokenstring.  Could we help?  Yes we can!

02 Rear Panel TextThis unit was actually made in the USA, and the city of Los Angeles has duplicated the work of UL/CSA, for a fee, of course.  Is this a great country or what?  Let’s get to work!

03 Reverb Tank

I took a picture to document where the RCA plugs on the spring reverb tank belonged when it came time to reassemble the unit.  My memory isn’t what it used to be.

04 QC Sticker

Nice to see that someone cared at one time.

05 LoudspeakersSeparate cable pairs come out of the chassis for each loudspeaker.  Nobody has touched this in a while!

06 Broken Input JacksToday’s mission objective is to fix this.  You can read my earlier rants about plastic input jacks and international safety approvals.  But, to keep this amp original, we will go back with the authentic Fender part.

07 Chassis on the Bench01Here’s the amp on the bench.  WARNING: Tech Porn To Follow

09 Chassis InteriorThis top view shows the usual single-sided circuit board found in a lot of consumer gear.  This amp is pretty clean inside!

12 Knobs

Get your knobs off.

10 Felt on SocketSome folks have asked about the felt-covered sockets I use.  Here is a closer picture of the one I will use on this faceplate.  The faces of a set of sockets is ground flat on a bench grinder.  A square scrap of felt from the fabric department is super-glued to the ground face.  When the glue is dry, an Exacto knife liberates any felt that is not glued to the socket itself.

11 Control Nuts Coming OffA little automation goes a long way.  This little low-rpm driver keeps the carpal tunnel problems away.

13 Closeup of Broken JackCompare the old jack on the left with the new jack on the right.

14 Another Happy CustomerThe reassembly is the reverse of the assembly.  Another happy customer picks up his amp!

Thanks for reading all the way to the bottom!


David Latchaw EE