Fender BJr repair

Amp Mad Scientist said:
The cement is used to glue the capacitors down to the board.
This is what Fender uses.
Otherwise, the caps can break off the board from vibration.

Isopropyl alcohol (91%) used for cleaning flux off of the circuit board.
Q tips, paper towels, toothbrush very handy for removing the flux from the board.
Buy this at the drug store / chemist shop, it's cheap.

Gloves: just to keep your hands out of the flux and alcohol.

Solder wick with rosin flux: pulls the solder out of the holes for parts replacements.
Rosin is the best flux for doing this job it works the best.
After you suck the solder out of the holes, clean off the flux with 91% alcohol.

Flux is conductive. That's why we clean all the flux off the board.
I would not recommend that you leave the flux on the board.
But rather clean it up nice and neatly.
Click to expand...
Thank you so much for taking the time to explain so well. Brilliant! It all makes sense.

So you glue the capacitors "body' to the board before soldering?

Thanks
 
@Amp Mad Scientist
My BJr 's case is I believe made of mdf. Based on your experience, I wanted to ask you if you hold strong views on the claimed superior tonal quality achieved by replacing the encasement with a pinewood one?

Tomorrow will pick the fuse' measurements as you suggested.

Thanks again
 
@Amp Mad Scientist,
On my quest for a wire wound resistor I came across this RAT site, did you see this?
I think I'm going insane. Never spared a thought for the inner guts of amps in my life before. Since we started conversing here I haven't touched my axes and spent my time marvelling at pretty couloured resistors, caps, etc.. And this RAT guy's work looks like Art to me!
It is beautiful work isn't it?! Or am I loosing it,.. What do you think?
 
STRefugee said:
@Amp Mad Scientist,
On my quest for a wire wound resistor I came across this RAT site, did you see this?
I think I'm going insane. Never spared a thought for the inner guts of amps in my life before. Since we started conversing here I haven't touched my axes and spent my time marvelling at pretty couloured resistors, caps, etc.. And this RAT guy's work looks like Art to me!
It is beautiful work isn't it?! Or am I loosing it,.. What do you think?
Click to expand...
Read what he says about changing R52 from 22K to 33K:

FBJ Lifesaver

fender blues junior bias setting
www.ratvalveamps.com www.ratvalveamps.com
 
STRefugee said:
@Amp Mad Scientist I understood that's what you were trying to do, and that makes a lot of sense. Glad you find the price reasonable and thanks for pointing out about the +_ poles.
Had I known about Mouser UK I had gone for the 450v too.

When I'll get onto the job I'll check with you before soldering.
So I still need to get some "wick" and control cleaner. Any recommended brand there?
And What "fuses" do you think i may need pls?
Cheers!
Click to expand...
I put the wick on the parts list.
I'm looking up the fuses right now.
There's some question about the fuses.

One of these fuses : you wrote "15A," then you wrote "5A"
You need to look at the fuse and see what's stamped on the metal.
I see it is 20mm X 5mm physical dimensions.
But did Did somebody install an over-sized fuse? It's not supposed to be 15A
What size A is that fuse supposed to be?

1739953989981.png
 
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Amp Mad Scientist said:
I put the wick on the parts list.
I'm looking up the fuses right now.
There's some question about the fuses.

One of these fuses : you wrote "15A," then you wrote "5A"
You need to look at the fuse and see what's stamped on the metal.
I see it is 20mm X 5mm physical dimensions.
But did Did somebody install an over-sized fuse? It's not supposed to be 15A
What size A is that fuse supposed to be?

View attachment 105176
Click to expand...

Hi @Amp Mad Scientist
You're looking at Fender BJr repair.
I'll double check when back home, but I believe the 15A250V is what's stamped on the fuse.
So yeah, seems someone put a 15A fuse in there instead of a 5A.
 
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