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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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21st May 2018, 1:51 pm | #21 |
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Re: DUCASTEL AC563 no sound
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. |
21st May 2018, 3:35 pm | #22 |
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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 Last edited by kentplums; 21st May 2018 at 3:36 pm. Reason: addition |
21st May 2018, 3:44 pm | #23 |
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Re: DUCASTEL AC563 no sound
One end was connected to where?
The other end was connected to where? Lawrence. |
21st May 2018, 4:40 pm | #24 |
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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 |
21st May 2018, 4:44 pm | #25 |
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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 |
21st May 2018, 5:05 pm | #26 |
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Re: DUCASTEL AC563 no sound
Excellent
thanks R |
24th May 2018, 4:30 pm | #27 |
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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 |
24th May 2018, 5:31 pm | #28 |
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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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24th May 2018, 9:23 pm | #29 |
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Re: DUCASTEL AC563 no sound
Thanks
R |
26th May 2018, 1:04 pm | #30 |
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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 |
26th May 2018, 1:18 pm | #31 |
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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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26th May 2018, 1:32 pm | #32 |
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Re: DUCASTEL AC563 no sound
OK thanks
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28th May 2018, 12:25 pm | #33 |
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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?? |
28th May 2018, 12:51 pm | #34 |
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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 |
28th May 2018, 1:37 pm | #35 |
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Re: DUCASTEL AC563 no sound
So in this case the wire coming off the secondary just dangles.
Thanks again R |
28th May 2018, 1:44 pm | #36 |
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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. |
28th May 2018, 6:06 pm | #37 |
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Re: DUCASTEL AC563 no sound
No, you're right, my mistake
R |
30th May 2018, 8:49 pm | #38 |
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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... |
15th Jun 2018, 2:28 pm | #39 |
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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 |
15th Jun 2018, 2:58 pm | #40 |
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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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