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1959 Blaupunkt receiver capacitors -Newbie

This is my first re-cap job, and my first post to this site.

I am replacing the capacitors on my 1959 Blaupunkt 40400 receiver and I do not know how to go about selecting replacements for these capacitors.

Can anyone please advise me on what these caps are for and what I would use to replace them

Any help would be appreciated
 

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Rod Coleman

Member
Paid Member
2004-07-25 6:55 pm
UK
Electrolytic [polarised] capacitors sound bad when they get old. When they get older still, they may leak corrosive fluid, or even explode. Changing them is the right thing.

4uF 350V would be expected to be for power supply stabilising. The value is not very critical. I recommend Nichicon VR series 4.7uF 450V for that position. Panasonics of many different series sound good too.

Don't use cheap unbranded or 'unknown' caps. They sound bad and have short life.
 
I used the wrong caps for the coupling capacitors

Thanks for assisting me in this endeavor

I realized I did not use 10% capacitors for the .022 450v coupling caps.

I will go and buy quality 10% 22t (.022uf) caps for the coupling caps and replace the ones I just put in with the 10% ones

I think I could put the new 4uf 450 filter caps (in the photo) underneath to preserve the original can caps look on top
 
I think I could put the new 4uf 450 filter caps (in the photo) underneath to preserve the original can caps look on top

If You, for "cosmetic reasons", want to preserve the look of the old capacitors, You can carefully remove the "guts" of them :smash:, and put the new capacitors in the empty shell with a small dab of hot glue.
I have seen this done in vintage radios, in most cases the new ones are physically smaller than the original.
Just my few cents.

Happy renovation.
Ebbe
 
For audio coupling caps in a typical receiver circuit 50% tolerance would be perfectly adequate! If the original were 0.022uF then you can probably use anything from 0.01uF to 0.047uF. There would be a minor difference in bass, but you are unlikely to notice.

Good news, since twice handled is twice work

I'll get those filter caps replaced today
 
Thanks for the feed back. It REALLY helps me keep moving forward and builds my artifical confidence

I just have two more sets of capacitors that I need some advise on.

#1
These small, brown, 0,04uf 150v look like molded caps

Should I change these out?
Any idea what they are for?

I noticed on this particular capacitor set that they do not appear to match the schematic. I only see two on the schematic

Any advise on these caps would be of great help to me

#2
Capacitors C846, C847. Wierd little tiny wire tube ones and an unmatching golden one

The schematic says 12, so is that 12pf?

The picture shows the two different caps one is clearly marked C847 and the other is the gold one, Should I change to match these? What are they for?

Again please advise


These pictures show lots of oldcaps that have been changed already, so don't flame me for the electrolytics visible.thanks
 

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C846 and C847 are denoted with an extra "dot" on the schematic which probably denotes the side that the outer wrapping of the capacitor is connected to. This is done to minimize noise pickup. I'm guessing that these don't need to be touched. As long as the correct value of fuse is installed (never assume!) you should be okay to power it up.