40uF 350V Capacitor

[archie2]

Doesn't anybody manufacture a 40uF/350V electrolytic capacitor anymore? I know of one place but I'm not going to wait 10 days to have it shipped air mail from Canada.
I mistakenly ordered a 20uF instead of a 40uF and cannot find a 40uF/350V or higher anywhere. I can find a 47uF and a 33uF, which is closest and how much difference will it make in an integrated amp?

 

[jon_s]

Considering that vintage capacitors were rated -20 to +80% tolerance, a modern 47uF capacitor will be very close to the original. I wouldn't worry at all with that small upsize!

 

[pich]

http://www.tubedepot.com/cp-at-40-500v.html

Expensive but 40uf. I have purchased from Tube Depot and their shipping is fast.

 

[jon_s]

http://www.tubedepot.com/cp-at-40-500v.html

Expensive but 40uf. I have purchased from Tube Depot and their shipping is fast.

And excellent quality, too :yes:

 

[Sir.Byrd]

I can't tell if these are polarized or not... http://www.mouser.com/Passive-Compo...Capacitors-Leaded/_/N-1b8ie?P=1z0wqroZ1z0vl8u

 

[archie2]

Considering that vintage capacitors were rated -20 to +80% tolerance, a modern 47uF capacitor will be very close to the original. I wouldn't worry at all with that small upsize!

Good info. In that case I'll order the mini 47uF/450V one from PE. The small size is to my advantage because I'm mounting these under the chassis where room is a bit tight.

 

[vfr800fiman]

If you have two 20uf you can put them in parallel.

 

[analog addict]

How about...

..this one?

$1.45 a throw. I've used these on multiple amp rebuilds, and had no problem whatsoever....

 

[dbCooper]

Considering that vintage capacitors were rated -20 to +80% tolerance, a modern 47uF capacitor will be very close to the original. I wouldn't worry at all with that small upsize!

Good point. I read somewhere that you can increase capacitance by 10% with no problems as long as the voltage rating stays the same or is increased.

jon_s, how do you like the multi section JJ caps shown in your avatar?

 

[dsndblm]

As the others said, the extra 7uf won't hurt anything. tubesandmore. com (A.E.S) has Sprague 40uf caps if you want the exact value.

 

[ferninando]

a higher V rating is good as it allows a higher working V less chance of breakdown/shorting. And 20-100% over cap value doesnt hurt either. just gives more energy storage and less pwr suply sag at low freqs.

 

[Tom Bavis]

22, 33, 47, 68 are the standard values these days. Since the tolerances are so wide, the 40s may be other value caps re-labeled as 40...