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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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30th May 2020, 1:04 pm | #41 |
Pentode
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Re: Watt Torino - Cadetto Repair
with rectifier valve removed voltage from transformer getting a reading of 400v
Last edited by real0real; 30th May 2020 at 1:10 pm. |
30th May 2020, 1:14 pm | #42 |
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Re: Watt Torino - Cadetto Repair
Is that the AC voltage between either of the anode connections and chassis?
Lawrence. |
30th May 2020, 1:16 pm | #43 |
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Re: Watt Torino - Cadetto Repair
yes from anode connection to chassis 400v
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30th May 2020, 1:20 pm | #44 |
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Re: Watt Torino - Cadetto Repair
would this when mean ordering the capacitors make sure there rated at 400v plus ?
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30th May 2020, 1:23 pm | #45 |
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Re: Watt Torino - Cadetto Repair
400VAC is the RMS (Root Mean Square) voltage. To convert this to peak voltage you'll need to multiply by the square root of 2, which as I said earlier is approximately 1.41.
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30th May 2020, 1:31 pm | #46 |
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Re: Watt Torino - Cadetto Repair
Note: I wrote the following before I read Grahams post.
Good job you checked that then if that measurement is to be believed. 400*1.414 = 565, that's potentially what the DC voltage across the HT electrolytics can rise to.... See what the others think, seems higher than usual to me even taking into account a field coil loudspeaker if that's what's fitted. Lawrence. |
30th May 2020, 1:38 pm | #47 |
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Re: Watt Torino - Cadetto Repair
Looking at pictures of a similar restored set suggests that the speaker is a field coil type.
I'd just fit 600V electrolytic caps and have done with it.
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30th May 2020, 1:44 pm | #48 |
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Re: Watt Torino - Cadetto Repair
will have a search for on internet and order 2
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30th May 2020, 1:46 pm | #49 |
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Re: Watt Torino - Cadetto Repair
If the circuit is to be believed there are a couple of other electrolytic caps in there.
One is connected to the cathode pin 8 of the 6V6. The other is connected to the cathode pin 6 of the 6B7 They'll be low voltage types. If wholesale capacitor replacement is to take place, replace any cap with a value in uF and leave those with a value in pF well alone.
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2nd Jun 2020, 1:26 pm | #50 |
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Re: Watt Torino - Cadetto Repair
The 2 600V electrolytic smoothing capacitors have arrived today , proceed to fit and test
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2nd Jun 2020, 2:57 pm | #51 |
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Re: Watt Torino - Cadetto Repair
Have just replaced the capacitors, switched on Radio now working OK.
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2nd Jun 2020, 3:32 pm | #52 |
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Re: Watt Torino - Cadetto Repair
Many thanks to everyone who as helped , specialy Graham as was bit confused at first as was unable to find a capacitor
Clive |