• New Sponsor: ShipNerd, Ship Your Gear with Us... for less! Click Here.

Replacing parts in Blues Deville

RJLII

Member
Messages
10,471
This schematic (it's the whole schematic) says the mid pot (R14) is a 25K Ohm pot. You'll learn more when you take it out. The jack shouldn't be anything special.
 
M

Member 48802

Unfortunately I'm pretty new to do-it-yourself amp mods, I didn't think the other schematic would do me any good! Looking at it though, it says the input jack I want to replace (J1) is a 4mVAC TP1. What does that mean? Also, where can I buy these parts?

And just a technical question, what's the easiest way to unsolder something with multiple joints? Soldering it in is easy but getting something out with joints all over the place is a bitch without multiple soldering irons!
 
Last edited by a moderator:

RJLII

Member
Messages
10,471
Actually that's a reference to a test point (TP1) As I understand it, 4mV is applied to the J1 Jack as an input signal during test.
 
M

Member 48802

Ah that makes sense...

I Googled 25k Ohm potentiometer and I wasn't getting the right type. It looked more like something you would put in a guitar, not an amp. The pot I took out (the mid pot) has B25K 9422 written on the side if that helps.
 

RJLII

Member
Messages
10,471
Ah that makes sense...

I Googled 25k Ohm potentiometer and I wasn't getting the right type. It looked more like something you would put in a guitar, not an amp. The pot I took out (the mid pot) has B25K 9422 written on the side if that helps.
B25K refers to the rating. 9422 is likely a date code or manufacturer ID. This guy should have it and the jack available for purchase. He's in Raleigh, NC.
 
M

Member 48802

Great, that's perfect. Real quick though, and it's not much, but in the name of the part I need on his site, [FONT=Arial, Helvetica, sans-serif]Fender Control Snapin 25K B, do you know what the B stands for? Is it pretty much B25K just in a different format?
[/FONT]
 

DT7

Member
Messages
2,794
Great, that's perfect. Real quick though, and it's not much, but in the name of the part I need on his site, [FONT=Arial, Helvetica, sans-serif]Fender Control Snapin 25K B, do you know what the B stands for?
[/FONT]
Linear...as opposed to log.
 

Gtowngearhead

Senior Member
Messages
840
All pots are going to look the same, it doesn't matter if they go into an amp, guitar, or pedal, unless you end up buying a mini pot.. But that just looks like a scaled down version. Electronic parts are electronic parts.
 
M

Member 48802

The pot that I'm going to buy doesn't have a casing around the shaft that you can screw a nut onto, it's built onto the angled piece you solder into the board, which is pretty different than a pot that goes into a guitar, yeah?
 

Gtowngearhead

Senior Member
Messages
840
Never seen that pot. Not a big fan of board mounted parts... But i'm not sure if I completely understand what you're saying. I've never opened up my deville so I guess the pots could be board mounted.. But if they are you're gonna have one hell of a time getting the original pot off w/o damaging something.
 
M

Member 48802

I got the original pot off already, the rotating shaft of the pot goes through a threaded barrel that's attached to an angled bracket which solders into the board. The shaft goes to the underside of the bracket where the actual pot casing hangs down.

It looks just like this:



If anyone has tips on desoldering a component with multiple solder joints I would greatly appreciate it. It has to do with taking off the input jack I want to replace. It's not exactly this jack but it's similar, with solder points laid out in a similar fashion that make them tough to remove with only one iron.



Ahaha I feel bad about all of these questions...but which input jack do I want, mono or stereo?
 
Last edited by a moderator:
M

Member 48802

I bought the parts this afternoon, I'll post back when I get them installed!
 

Gtowngearhead

Senior Member
Messages
840
Ok now I understand what you mean... One of the upgrades for the Devilles is replacing the OD volume to an audio taper pot.. But you normally have to fab that bracket yourself... The pot is the same, it just has a bracket... And as for removing solder.. There is a desoldering braid you can buy.. You lay the braid (i think it's copper) over top of the solder, then put the iron to the braid over the solder joint, and the braid should suck up the solder. Mono should be fine I'm pretty sure..
 
M

Member 48802

I was considering clipping the individual leads of the input jack and then desoldering them one by one, but I think I have some desoldering braid somewhere...don't know why I didn't think to use it!
 




Top Bottom