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13th Sep 2018, 8:47 pm | #1 |
Diode
Join Date: Sep 2018
Location: Southend on Sea, Essex, UK.
Posts: 5
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Meazzi component identification.
Newly joined, starting to get interested, does anyone know what value these dipped capacitors, if they are capacitors, are?
Thanks in advance, Colin. |
13th Sep 2018, 9:48 pm | #2 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,527
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Re: Meazzi
There's only one thing that might be a dipped capacitor in the first pic- 4700pF perhaps? Second pic is too blurred to see anything.
Perhaps clear pics edited to show which components you mean would help. In any case, unless they're tantalum bead electrolytics, what are commonly called dipped capacitors are unlikely to be faulty. Most likely faulty parts in pic 1 would be the carbon composition resistors, particularly the high valued ones. Very long shot- I knew a Colin Chandler when I worked at Racal Bracknell late '70s early '80s, any connection?
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16th Sep 2018, 7:44 pm | #3 |
Diode
Join Date: Sep 2018
Location: Southend on Sea, Essex, UK.
Posts: 5
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Is this a resistor?
The little blob with yellow purple and red on it, does anyone know what it is?
Yes I am just getting interested in valve circuits, thanks for any comments Colin |
16th Sep 2018, 7:58 pm | #4 |
Diode
Join Date: Sep 2018
Location: Southend on Sea, Essex, UK.
Posts: 5
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Re: Meazzi
Thankyou for your reply, I will take a better pic
No it's not me a was still at school til 1980 Regards colin |
16th Sep 2018, 9:34 pm | #5 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,637
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Re: Is this a resistor?
It's a Philips ceramic capacitor. The colour code is the same as that for resistors.
Yellow - 4 Purple - 7 Red - 2, but as it's the last band it's 2 zeros, making 4700pF. It will be almost certainly OK. |
16th Sep 2018, 11:10 pm | #6 |
Hexode
Join Date: Jan 2007
Location: Welwyn Garden City, Hertfordshire, UK.
Posts: 453
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Re: Is this a resistor?
Hello Bill,
Are you referring to the tubular capacitor? If so, I think the OP meant the tantulum-like round blob to the right of the tubular one, it has the same colour code of Yellow - 4, Purple - 7 and Red - 2, so is also 4700pF Regards, Dave. |
16th Sep 2018, 11:35 pm | #7 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
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Re: Is this a resistor?
It's also the component I referred to in the first post about this unit as the only one that looked like a dipped capacitor......
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17th Sep 2018, 8:28 am | #8 |
Nonode
Join Date: May 2007
Location: Preston, Lancashire, UK.
Posts: 2,510
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Re: Is this a resistor?
Not answering your question, but I would respectfully suggest that if you are only just getting interested in valve circuits then the shambolic mess shown in your picture isn't a good place to start!
Whatever it started out as, its now only fit for the scrap bin IMHO. Andy |
17th Sep 2018, 9:59 am | #9 |
Rest in Peace
Join Date: May 2003
Location: Harlaxton, Lincolnshire, UK.
Posts: 3,944
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Re: Is this a resistor?
Hi Colin
This link will probably be useful to you. https://www.vintage-radio.com/repair...ion/index.html You will see there is a section called "Valve radio components" which should be of particular interest. There is a lot of other information in the linked page that will be of interest to someone just starting out in vintage radio. |
17th Sep 2018, 10:14 am | #10 |
Dekatron
Join Date: Feb 2007
Location: Lynton, N. Devon, UK.
Posts: 7,061
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Re: Is this a resistor?
There's a long thin tubular capacitor with yellow, purple, red (or brown) on it - and also a round bead tantalum capacitor with yellow, purple, red!
Not sure which Colin is referring to - but hopefully this will answer. Neither are resistors. |
17th Sep 2018, 10:56 am | #11 |
Dekatron
Join Date: Feb 2003
Location: Cottingham, East Yorkshire, UK.
Posts: 5,737
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Re: Is this a resistor?
As Colin referred to it as 'the little blob with yellow purple and red on it' there's only one that meets that description, as circled on the annotated pic below. The only confusion is the value, because tants of that era often had three strips and a dot. Reading from the top, that's the first number, then the next stripe down is the second number, then a dot is the multiplier and the last stripe (next to the wire leadouts) is the Voltage rating.
So, yellow = 4, purple = 7, but is the last stripe the multiplier or the rated Voltage? (Is there a dot visible out of view?). If there's no dot, then the last stripe is probably the multiplier - if brown = 10, if red = 100, so that suggests either 470pF or 4,700 pF. Time to reach for the Chinese multi-tester! Thanks goodness that for many years, capacitance has been printed on tants, and as need be, polarity. http://www.hamradio.cc/electronics/t...olor_codes.php
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David. BVWS Member. G-QRP Club member 1339. |
17th Sep 2018, 11:06 am | #12 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Is this a resistor?
Tants ?
Lawrence. |
17th Sep 2018, 11:14 am | #13 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
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Re: Is this a resistor?
To me the second lead appears to come from the side of the capacitor, which is what I based my answer on, but if both come from the bottom, Tantalum is favourite. As pointed out, the tubular ceramic capacitor is also 4700pF!
Are you trying to repair this, or just studying it? |
17th Sep 2018, 11:29 am | #14 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
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Re: Is this a resistor?
To be clear, I was questioning "tants" as per Davids post as the colour code doesn't compute for a tantalum let alone the valve era and the voltages normally encountered.
Lawrence. |
17th Sep 2018, 12:42 pm | #15 | |
Nonode
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 2,562
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Re: Is this a resistor?
Quote:
Regards Symon. |
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17th Sep 2018, 12:53 pm | #16 |
Nonode
Join Date: Jan 2008
Location: Milton Keynes, Bucks. UK.
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Re: Is this a resistor?
Colinchandler
I find, when trying to identify a component, using an arrow to point it out is a great help. Or, as David G4EBT suggests. Rgds
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18th Sep 2018, 8:27 pm | #17 |
Pentode
Join Date: Sep 2005
Location: Athens, Greece
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Re: Meazzi component identification.
I found these old times caps in my junk box. They are ceramic(?) caps at pF range made by Philips.
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Regards, John |
18th Sep 2018, 9:12 pm | #18 |
Pentode
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Re: Meazzi component identification.
I found also from a 1970's PHILIPS POCKETBOOK the attached scan.
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Regards, John |
18th Sep 2018, 9:23 pm | #19 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
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Re: Meazzi component identification.
Pin ups.
Lawrence. |
18th Sep 2018, 9:37 pm | #20 |
Nonode
Join Date: May 2007
Location: Redruth, Cornwall, UK.
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Re: Meazzi component identification.
Hi.
They're good reliable caps. In mitajohn's post (#17), the values from left to right look to be, 56pF, 82pF and 390pF. Regards Symon. |