Dansette Junior capacitor identification

[Kalee21]

Help I’m having trouble Identifying A wax capacitor it looks like 0.01uf 1000v dc
But not sure it’s in a amp with the UCL83 valve plus can anyone recommend a
Suitable replacement
Thank you

[Edward Huggins]

This sounds like what we call "that" cap, the coupling capacitor between the triode and pentode sections of the UCL83. There's a circuit for this amp available from this Site - see top RH Corner of this page.

[snowman_al]

It is really important to know where it is in the circuit before making a suggestion.
Is it a coupling cap or part of the input circuit or a mains 'filter'?
A picture would help.
Alan

[paulsherwin]

If it's rated at 1kV then it sounds like the tone correction capacitor. This will either be across the output transformer primary or from one end of the primary to the chassis. You can replace it with any modern cap of the right value rated at 1kV or higher.

[Station X]

I had a look at the circuit diagram for this player and could not find a 0.01uF cap that would require a 1000V rating.

[Maarten]

In the schematic I found, the only .01 capacitor is "that cap". A 400V or 630V version would be fine. Maybe a 1kV version was originally used to reduce leakage and increase reliability. Depending on the brand, sometimes capacitors were marked with a test voltage instead of a working voltage. I doubt if that's the case here, but it seems worth mentioning anyway.

[Station X]

Agreed.

We seem to be getting a lot of threads where we're expected to identify a component and recommend a source, yet we're given insufficient info. The component designation or location in the circuit along with a photo often helps.

[Kalee21]

Sorry for the delay I’ve attached a photo of the little fellow

['LIVEWIRE?']

That is, as marked on it, a 10nf(0.01uf) 1000v Waxed Paper Capacitor, possibly part of the tone control. A suitable replacement would be one of the yellow LCR or similar axial capacitors of the same value and working voltage.

[paulsherwin]

I don't have a circuit, but I'd be very surprised if a 1kV part was actually needed there. A 630V or 400V part should be fine and will be easier and cheaper to source. However, a 1kV part will certainly do no harm and is the safer choice if you are unsure.

[Michael Maurice]

Looking at the diagram, there are two possibilities, one in series with the tone control, one between the anode of the triode and the grid of the pentode.

In this circuit the tone control is across the grid of the triode so a 400V type will suffice.

[David G4EBT]

You can buy 630V 0.01µF polypropylene axial capacitors from a UK supplier at the link below. They're £3.99 for ten and 99p post.

They have a range of other values too:

https://www.ebay.co.uk/itm/10x-Capac...AAAOSw-xNbXvux

I'd be quite happy with 630V, but if you were concerned about wanting a 1,000V capacitor, you can buy disc capacitors here from a UK supplier (they have a range from 2K to 15K). A single 2KV .01µF cap would be £1.79 post free:

https://www.ebay.co.uk/itm/10pF-100p...frcectupt=true

Or you can get 1,000V 0.01µ disc ceramic caps from this UK supplier at five for 99p post free:

https://www.ebay.co.uk/itm/10pF-10nF....c100005.m1851

Hope that might help.

['LIVEWIRE?']

Thanks for those useful links, David. I often use the yellow axial caps in old radios, etc., so I may bookmark the page. As to the Dansette I wasn't sure if the 0.01 cap. was the tone one or 'that cap'. If the Op wants more info., the service sheet is available from VRSD for £1.99.

[Kalee21]

Thank you for all the reply’s and valuable information it was the 1000 volt which made me hesitate
Once again thank you it’s been a great help

[Techman]

I've also bought those self same yellow axial capacitors from the seller in David's first link and can recommend both the capacitors and the seller as reliable.

Cricklewood Electronics in London also sell very similar capacitor types and I've also found them to be very reliable regarding both their parts and service.