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Old 21st May 2018, 1:51 pm   #21
ms660
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Default Re: DUCASTEL AC563 no sound

Quote:
Originally Posted by kentplums View Post
the overall picture may clarify...
The pin numbers on the valve socket are read anti-clockwise, pin 1 is just under that black resistor pins 2&3 are the heater connections, pin 4 is almost certainly connected to pin 1.

Pin 5 is almost certainly connected to pin 8 (pin 8 obscured by the capacitor)

CY2 valve connections>>>>k1 = pin 1 , k2 = pin 4, a1 = pin 5, a2 = pin 8, heater = pins 2&3.

If that is so then it means that the two cathodes are connected together as are the two anodes, this is what we would expect. One end of the capacitor concerned is clearly connected to pin 5 (the anode(s)) and the other end appears to be connected to pin 1 (the cathode(s)) this means that the capacitor is bypassing the rectifier, the usual reason for that is to shunt any RF, this would mean that it can't be an electrolytic and is unlikely to be in the sub 1,000pF range, I'm still thinking 0.05uF

So far as I can make out.

Lawrence.
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Old 21st May 2018, 3:35 pm   #22
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Default Re: DUCASTEL AC563 no sound

Thanks Lawrence. Just found a French site and the 50/000 is in fact .05 µf.

Next question: there is a large brown cap coming from the ECH3 to grid , markings are as follows: RADAR (brand name)
condensateur electrochimique
2 50 (small)
tension 500 550
capacité 1x8

there are no signs of polarity...could it possibly be 8µf ??
There will be more questions!
By the way that black blob to the left was me dropping a felt pen on it...
R
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Old 21st May 2018, 3:44 pm   #23
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Default Re: DUCASTEL AC563 no sound

One end was connected to where?

The other end was connected to where?

Lawrence.
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Old 21st May 2018, 4:40 pm   #24
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Default Re: DUCASTEL AC563 no sound

from the pin marked g² + 4 below

https://www.radiomuseum.org/tubes/tube_ech3.html

going to thick wire running down centre of chassis

Excuse my layman's speak...

R

Last edited by kentplums; 21st May 2018 at 4:44 pm. Reason: spelling
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Old 21st May 2018, 4:44 pm   #25
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Default Re: DUCASTEL AC563 no sound

Ok, that suggests an 8uF electrolytic capacitor, a replacement would be something like a 10uF 450 volt, the -ve connection would be the one that was connected to the thick wire bus bar running the length of the chassis.

Lawrence.

Last edited by ms660; 21st May 2018 at 5:01 pm. Reason: re-written
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Old 21st May 2018, 5:05 pm   #26
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Default Re: DUCASTEL AC563 no sound

Excellent
thanks
R
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Old 24th May 2018, 4:30 pm   #27
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Default Re: DUCASTEL AC563 no sound

One more then I'm done - honest.
This cap goes from wavechanger to chassis....10,000 pf and 1500v , but is it likely to be an electrolytic? I've got to ask, even though it seems unlikely to me.
Nice artwork on it though...
Cheers
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Old 24th May 2018, 5:31 pm   #28
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Default Re: DUCASTEL AC563 no sound

No. The smallest electrolytic capacitors were 470nF and if you encounter one of this value, you can safely replace it with a polyfilm type.
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Old 24th May 2018, 9:23 pm   #29
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Default Re: DUCASTEL AC563 no sound

Thanks
R
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Old 26th May 2018, 1:04 pm   #30
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Default Re: DUCASTEL AC563 no sound

For the caps rated at 1500v, what would be a useable replacement - anything lower or must it be that rating?
Cheers
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Old 26th May 2018, 1:18 pm   #31
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Default Re: DUCASTEL AC563 no sound

If it's connected between mains and touchable metalwork, it needs to be Class Y (which implies a voltage rating). Otherwise a capacitor that may be exposed to HT voltage needs to be rated for at least that voltage; double that if it has a coil in parallel with it.
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Old 26th May 2018, 1:32 pm   #32
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Default Re: DUCASTEL AC563 no sound

OK thanks
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Old 28th May 2018, 12:25 pm   #33
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Default Re: DUCASTEL AC563 no sound

On to the output TX. There are 4 wires attched to rear. left to right: 1st goes to bus bar, 2nd goes to +ve of 50µf cap(big blue one)3rd goes to CBL6 pin 4 (marked k in diag below), and 4th goes...nowhere - snipped off and tidied under chassis (see photo).

https://www.radiomuseum.org/tubes/tube_cbl6.html

Is this normal??
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Old 28th May 2018, 12:51 pm   #34
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Default Re: DUCASTEL AC563 no sound

The primary (usually greater than 200 ohms) should be connected between HT and the anode, the secondary (usually less than 1 ohm) should be connected to the loudspeaker, sometimes one end of the secondary is also connected to chassis and the other end to a feedback network if one is fitted, or sometimes to an external loudspeaker socket if fitted.

Lawrence.

Last edited by ms660; 28th May 2018 at 1:14 pm. Reason: addition
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Old 28th May 2018, 1:37 pm   #35
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Default Re: DUCASTEL AC563 no sound

So in this case the wire coming off the secondary just dangles.
Thanks again
R
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Old 28th May 2018, 1:44 pm   #36
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Default Re: DUCASTEL AC563 no sound

One end of the primary should be connected to pin 8 (anode) of the CBL6, not pin4 (cathode) as you have stated unless it's been wired for a different valve.

Lawrence.
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Old 28th May 2018, 6:06 pm   #37
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Default Re: DUCASTEL AC563 no sound

No, you're right, my mistake
R
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Old 30th May 2018, 8:49 pm   #38
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Default Re: DUCASTEL AC563 no sound

FYI everybody...

http://radios-tsf.fr/00%20rubrique-d...densateur.html

In French but the values may help out in future...
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Old 15th Jun 2018, 2:28 pm   #39
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Default Re: DUCASTEL AC563 no sound

Pop went the baretter.....
Drama! After a recap I plugged in and turned on....everything was as before except a slight creaking sound which was curtailed by a loud pop as the baretter imploded. That crack was obviously a weak point.
Bizarrely the baretter continues to glow in all it's naked glory, and even more amazingly, I have sound when touching PU input and wavechanging. Result.
So what are my options ?? No luck finding a new tube so far, so is there any way to bypass/modify/replace the current set up? Using the existing base could another baretter be substituted or conversley change the base and use a suitable substitute?
Any thoughts
Cheers
R
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Old 15th Jun 2018, 2:58 pm   #40
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Default Re: DUCASTEL AC563 no sound

See if forum member Ed_Dinning could wind you a custom transformer? It would not be cheap, but neither would a new barretter .....
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