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Old 13th May 2018, 7:53 am   #1
kentplums
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Default DUCASTEL AC563 no sound

Following on from valve ID thread, I am going to recap throughout in an attempt to get some sound.
Valves are glowing and baretter seems to function.
Mostly straight forward - most if not all cap values are visible.
Can someone tell me what the black/ blue component (looks a bit like a liquorice Allsort) is in pics 2 and 3 ? I assume it's a resistor of some kind....value? Also there is a strange rusty metal doughnut bottom right of centre on pic of underneath of chassis...

Nearest I can find for schematic is

radialva V69 fiche 2391 on Doctsf.com..
http://www.doctsf.com/documents/affi...0700&num_fic=1

Different radio but same line up.
I have slight hum from speaker and crackling when wavechanging but no noise from PU input and no radio.
Thanks
R
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Old 13th May 2018, 9:07 am   #2
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Default Re: DUCASTEL AC563 no sound

Looking at the 2nd photo, the middle component (black with some white) looks like a wire wound resistor so far as I can make out, the component to the right of it (blue) is an electrolytic capacitor, the doughnut shaped thing (1st photo bottom right) looks to be a coil, either a band coil or possibly part of a filter trap in the antenna circuit as a guess.

According to the data I posted earlier, the R30N is slightly different to the R20N, it looks like the R30N might use a shunt resistor in that Radialva schematic that was posted.

Lawrence.

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Old 13th May 2018, 9:09 am   #3
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Default Re: DUCASTEL AC563 no sound

Quote:
Originally Posted by kentplums View Post
Following on from valve ID thread, I am going to recap throughout in an attempt to get some sound.
Wholesale replacement of components is never a good idea.

I suggest measuring voltages starting with the HT on the smoothing caps.
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Old 13th May 2018, 2:54 pm   #4
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Default Re: DUCASTEL AC563 no sound

Don't forget to replace the CBL6's control grid coupling capacitor otherwise damage to components may result.

Lawrence.
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Old 20th May 2018, 4:27 pm   #5
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Default Re: DUCASTEL AC563 no sound

The glass/ black cap top left has what appears to be 50/000 MFD as a value.
What would that equate to please?? Would that be 0.05 MFD?
Thanks
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Old 20th May 2018, 4:30 pm   #6
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Default Re: DUCASTEL AC563 no sound

Can you turn it to get a better picture, could be 50uF 200V, but a guess with that picture.
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Old 20th May 2018, 4:42 pm   #7
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Default Re: DUCASTEL AC563 no sound

Slightly better, everything else is in focus!
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Old 20th May 2018, 4:45 pm   #8
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Default Re: DUCASTEL AC563 no sound

Does it show any signs of polarity markings?
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Old 20th May 2018, 6:12 pm   #9
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Default Re: DUCASTEL AC563 no sound

No none, it is in the same style as several others in the set, and many I have come across before, but the value seems in a strange format. That's why I'm thinking 50 divided by 1000 = 0.05...ie 0.047µf

R
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Old 20th May 2018, 6:23 pm   #10
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Default Re: DUCASTEL AC563 no sound

It's an unusual physical size for that value, that's why I doubted it at the time. Hopefully someone else can answer your query.
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Old 20th May 2018, 6:31 pm   #11
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Default Re: DUCASTEL AC563 no sound

What's its circuit function?

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Old 20th May 2018, 6:50 pm   #12
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Default Re: DUCASTEL AC563 no sound

Looking a bit closer (post#5 photo) it looks as though it might be fitted to reduce modulation hum, it appears to be connected between the two strapped anodes and the two strapped cathodes of the CY2 rectifier....?

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Old 20th May 2018, 8:06 pm   #13
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Default Re: DUCASTEL AC563 no sound

Maybe relevant from an old response to another question from Herald1360...

"The 0.25/1000 is more likely to be 250pF than 250nF simply on size grounds. There's no way it could be 250nF 1000V at that size and vintage. "

....so if 0.25/1000 were to be 250pf then 50/1000 would be 50nf which is 0.05µf? or am I helplessly lost?
RRR

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Old 20th May 2018, 8:16 pm   #14
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Default Re: DUCASTEL AC563 no sound

If it's across the rectifier (post#12) I would go for 0.05 uF (0.047uF)

Lawrence.
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Old 20th May 2018, 8:20 pm   #15
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Default Re: DUCASTEL AC563 no sound

That looks like a plan! Thanks
R
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Old 20th May 2018, 8:24 pm   #16
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Default Re: DUCASTEL AC563 no sound

Make sure it's rated OK in the voltage department, I would go 630 volts as minimum for 110 volt supply or 1,000 volt minimum for 230/240 volt supply.

Mains spikes and all...

Lawrence.

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Old 20th May 2018, 8:28 pm   #17
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Default Re: DUCASTEL AC563 no sound

In the worst case, the voltage across the rectifier will be twice peak mains; the cathode will be held at (very nearly) + peak mains by the reservoir capacitor for the other half-cycle, during which the anode will pass through - peak mains.
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Old 20th May 2018, 8:29 pm   #18
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Default Re: DUCASTEL AC563 no sound

Is that not 50/1000 or 0.5uF?
Far too small to be 50uF, certainly more than just a few pF.
Those markings MUST mean something surely?
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Old 20th May 2018, 8:30 pm   #19
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Default Re: DUCASTEL AC563 no sound

OK thanks

the overall picture may clarify...
R
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Old 21st May 2018, 12:39 am   #20
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Default Re: DUCASTEL AC563 no sound

The black component with the white flecks, as lawrence has already said, is a wire wound resistor,
and if it's OK i would just leave it alone

The blue capacitor on the right, is a 50uF capacitor rated at 150-165 volts. There is a small ordinary resistor, that has a long uninsulated wire coming from it, that eventually connects to a thin black insulated wire, just to the bottom left of the blue capacitor, that has a value of either 2 Meg ohms, 2,000,000 ohms, 2.1Meg ohms or 2,100,000 ohms.

The sandy coloured capacitor with the black pitch ends, that is close to the edge of the wire wound resistor, is 0.05uF 50,000pF at 1,600 volts' the modern equivelent to this would be 0.047uF and I would think, that a voltage of 1,500V would be adequate.

As for the black capacitor with the strange zeroes on it, that looks like an early type of Metalmite capacitor, with what apears to be a plastic jacket on it, in my experience these are usually in the hundreds of microfarads. So one possibility, it could be 50/050 uF ie 50 uF at 50 volts tending to go on the side of Stephen's suggestion, but I don't think it's big enough to be 200 volts as that would be the size of a can. The middle zero after the slash sign, seems to look like it may have been a 6 but I doubt that very much, more likely to have been a 5 if indeed it was another number, other than a zero, I'm a bit puzzled by that one.

Paul.
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