Capacitor question.

[kirstyd]

Hi all . can anyone suggest a replacement for this please . It has 5 MFD printed on it

[Techman]

It's a 5uf. Find a close value at or above the top working voltage printed on the case.

[paulsherwin]

A modern 4.7uF electrolytic of the correct voltage rating should be OK.

[kirstyd]

Ok .Thanks guys

[Bazz4CQJ]

Originally Posted by paulsherwin

A modern 4.7uF electrolytic of the correct voltage rating should be OK.

It seems to me that many of the "run of the mill" electrolytics that are around these days give measured values of C which are around the 20% low mark compared to the labelling. While doubt it will be critical, if you need to buy an item in, a nominal 5.6uF would be worth considering.

B

[paulsherwin]

Agreed, nothing wrong with that. The value is unlikely to be critical.

[The Philpott]

Aerolite...? Possibly made of Gordon-Aerolite, the early composite of flax and resin. (It's certainly the correct colour)
Dave

[John_BS]

I'm pretty certain this is an old paper/wax capacitor, and it's 0.5uF, not 5uF. Have a search on ebay: there's something very similar for sale in the US. If your capacitor is about the size of this one, it's almost certainly 0.5uF.

Vintage 1950s Aerovox Aerolite Wax Capacitor .5 uf 400v Crossover tone Cap

https://www.ebay.co.uk/itm/115040895069

[Station X]

If we knew the capacitor's position in the circuit it would be possible to determine its likely value.

[ms660]

'ere:

https://worldradiohistory.com/hd2/ID...-Page-0127.pdf

Lawrence.

[Andrew B]

I agree, it's probably 0.5 MFd, the banded end marks the ground end of it.

[Craig Sawyers]

Originally Posted by ms660

'ere:

https://worldradiohistory.com/hd2/ID...-Page-0127.pdf

Lawrence.

Yup. Back in the day they weren't big on leading zeros, so would label a capactiror .5 and not 0.5

The leading . was easy to rub off or become illegible, so a nominal 0.5uF capacitor could be mistaken for 5uF

Craig

[kirstyd]

Hi all
i recently asked a question about the brow cap in the photo but cant seem to find the thread anywhere . What i wanted to know is weather the yellow caps would be a suitable replacement ., I found them in my box of stuff and wondered if they would do the job before i go buying new ones

[ms660]

Originally Posted by kirstyd

Hi all
i recently asked a question about the brow cap in the photo but cant seem to find the thread anywhere . What i wanted to know is weather the yellow caps would be a suitable replacement ., I found them in my box of stuff and wondered if they would do the job before i go buying new ones

No, a 0.47uF at at least 200 Volts DC working is what you need.

Lawrence.

[Simon Gittins]

The other thread is here: https://www.vintage-radio.net/forum/...d.php?t=190859
The photo you have just posted is clearer and shows .5uF so you need 0.47uF not 4.7uF.

[kirstyd]

thanks Simon .i couldn't find that thread anywhere
cheers

[Techman]

Originally Posted by kirstyd

Hi all
i recently asked a question about the brow cap in the photo but cant seem to find the thread anywhere .

The problem is that you keep posting in the wrong section, so the post gets moved. It's a question about a component, not a piece of audio gear, so needs to be in the components section, so I guess that this thread will also disappear from this section too.

Yes, we got it wrong about the original value as we couldn't see the 'dot', which is now very visible on your latest photo. The line around the end of the capacitor indicates the outer foil connection, which must preferably be connected to the low impedance side of the circuit.

[Station X]

Originally Posted by kirstyd

Hi all
i recently asked a question about the brow cap in the photo but cant seem to find the thread anywhere .

Threads merged.

[kirstyd]

sorry folks .i didn't know about the components section. after looking at a blown up photo of the brown cap i can now see the point before the 5 . In the photo you can see where they are in the circuit [down in the right hand bottom corner] . one end is connected to the centre tap on the contour control and the other end is on the two phono sockets .these have leads plugged into them that go off to the separate amplifier

[Sideband]

It's more helpful if we can see the circuit diagram. It's not possible just by looking at the layout exactly what they do in the circuit. We can now be sure that they are 0.5uF though so it probably doesn't really matter.