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Granada Television Brochure, 1970s
Long Gone UK TV Shops
Memories of a Derwent Field Service Engineer
PYE Australia Circa 1971
Radios-TV VRAT
Fabulous Fablon
Thorn TX10 Chassis
Crusty-TV Museum, Analogue TV Network
Philips N1500 Warning!
Rumbelows
Thorn EMI Advertising
Thorn’s Guide to Servicing a VCR
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Want to tell us a story?
Video Circuits V15 – Tripler Tester
Thorn Chassis Guide
Remove Teletext Lines & VCR Problems
Ceefax (Teletext)
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
D|E|R Service “The Best”
The one that got away
Technical information
The Line Output Stage
The map
Tales of a newly qualified young engineer.
Tales of a Radio Rentals Van Boy
Sanyo SMD
Disastrous Company Rebranding
1969 Philips G22K511
Memories Of The TV Trade
Crazy house
Dirty TV screens
Dual Standard and Single Standard CTV’s
Radios-TV on YouTube
The Winter of 62/63
A domestic audio installation
1979 Ferguson Videostar Deluxe 3V16
Music centre modifications
Unusual record player modification
B&K 467 Adapters
Mishaps In The Trade
1971 Beovision 3200
1971 Bush CTV1120
Question HMV 2208; Replacement/Equivalent Cap
Can anyone recomend a replacement/equivalent Cap for a "Hunts" 0.003uF 300Vac Capacitor .
It is from a HMV 2208 Reel to Reel Tape Recorder "Hunts" (the manufacturer) 0.003uF 300Vac capacitor connected across the audio output transformer's primary winding
Cheers
Spike
Schematics Screen shot Schematic 2 clipped.pngScreen shot Schematic 1 clipped.pngScreen shot Schematic 3.png
Posted by: @cathovisorSearch the Internet for 3300pF/3.3nF at 1000V DC polypropylene film capacitor.
Hi
Can only find 630v type Cap .
cheers
Spike
Posted by: @spike47Can anyone recomend a replacement/equivalent Cap for a "Hunts" 0.003uF 300Vac Capacitor .
When replacing caps, follow these basics.
Capacitance; replace with like for like or the modern equiv value e.g .05uF(old) .047uF(new)
Voltage general rule of thumb; same voltage or higher is OK, but never lower.
When VAC is stated, multiply this by 3 for VDC. This is why Catho stated 1000VDC. 300VAC x 3 =900VDC which you will not find, so 1kV (1000VDC) is what you need. Keep looking and try the big outlets RS & Farnel etc.
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https://www.cricklewoodelectronics.com/C2K3N3.html
or parallel these.
https://www.cricklewoodelectronics.com/CAT1N0.html
https://www.cricklewoodelectronics.com/2200pF-1500V-Polypropylene-Axial-Capacitor.html
I would probably use the first item.
Frank
Posted by: @nuvistorhttps://www.cricklewoodelectronics.com/C2K3N3.html
or parallel these.
https://www.cricklewoodelectronics.com/CAT1N0.html
https://www.cricklewoodelectronics.com/2200pF-1500V-Polypropylene-Axial-Capacitor.html
I would probably use the first item.
Hi
Paralleling them both you mentioned would be the cheapest method, would I be good to go on that ?
spike
I would use this,
https://www.cricklewoodelectronics.com/C2K3N3.html
It will be cheaper, smaller and easier to fit. I mentioned the others in case you didn’t want to use ceramic.
The type above will do the job for less than £1. At first glance it’s a tone correction capacitor so not too stringent a job apart from requiring a high working voltage.
Frank
Posted by: @nuvistorI would use this,
https://www.cricklewoodelectronics.com/C2K3N3.html
It will be cheaper, smaller and easier to fit. I mentioned the others in case you didn’t want to use ceramic.
The type above will do the job for less than £1. At first glance it’s a tone correction capacitor so not too stringent a job apart from requiring a high working voltage.
Hi
Thanks for your reply, yeh not sure about the ceramic one, dosen't look like it will hold much capacitance, if that is the correct phrase to use !.
Cheers
Spike
The capacitor is there to bypass higher audio frequencies, as the audio frequency increases the capacitive reactance will reduce,. Eg at 1000hz it’s reactance is around 48k ohms, at 10000hz it’s around 5k ohms. This will reduce the higher audio frequencies being passed through to the speaker and make the sound more mellow. Some manufacturers would put a variable resistor in series with the capacitor and have an adjustable “ Tone control” on this recorder it is fixed.
The requirement for a high voltage capacitor is the possibility of high voltage spikes on the audio transients.
Any comments and corrections appreciated, it’s a long time since I did this sort of thing.
Frank
Posted by: @nuvistorThe capacitor is there to bypass higher audio frequencies, as the audio frequency increases the capacitive reactance will reduce,. Eg at 1000hz it’s reactance is around 48k ohms, at 10000hz it’s around 5k ohms. This will reduce the higher audio frequencies being passed through to the speaker and make the sound more mellow. Some manufacturers would put a variable resistor in series with the capacitor and have an adjustable “ Tone control” on this recorder it is fixed.
The requirement for a high voltage capacitor is the possibility of high voltage spikes on the audio transients.
Any comments and corrections appreciated, it’s a long time since I did this sort of thing.
Hi
Thanks for that info, the Cap question came originaly because the Tape has a very low vollume and someone suggested this Cap ! .
Cheers
Spike
Well if the capacitor had a high leakage it could reduce the volume but I suggest some standard fault finding. Disconnect one end and test it, the recorder will work without it but have more treble. You will probably find it’s other faults that are causing the low volume, presume the tape heads are clean and not badly worn.
What test equipment have you?
Frank
Posted by: @nuvistorWell if the capacitor had a high leakage it could reduce the volume but I suggest some standard fault finding. Disconnect one end and test it, the recorder will work without it but have more treble. You will probably find it’s other faults that are causing the low volume, presume the tape heads are clean and not badly worn.
What test equipment have you?
Hi
Thanks for your reply, just a Digi Multimeter I am afraid !.
Cheers
ps: Yes I think I will remove that Cap to see if that makes any difference, could be a resistor now with its age !.
Spike
No point guessing, you could change many items and not find the fault.
Are you capable of safely taking voltage readings? If you are then that is one way to start, there are other ways but that would be a guide.
Do you know how the tape recorder works, what each stage does? A basic understanding helps to fault find.
Frank
Posted by: @nuvistorNo point guessing, you could change many items and not find the fault.
Are you capable of safely taking voltage readings? If you are then that is one way to start, there are other ways but that would be a guide.
Do you know how the tape recorder works, what each stage does? A basic understanding helps to fault find.
Hi Frank
Thanks for your reply I wasn’t guessing a member on here suggested that , I was an Electrician in my earlier life 😊
@spike47
it was the comment about it could be a resistor that gave me cause for concern.
No harm in trying the capacitor but if you that doesn’t fix the fault then a standard fault finding technique would hopefully find the problem.
Frank
Posted by: @nuvistor@spike47
it was the comment about it could be a resistor that gave me cause for concern.No harm in trying the capacitor but if you that doesn’t fix the fault then a standard fault finding technique would hopefully find the problem.
Hi Frank
Thanks again for your reply, that bit about a resistor was also from a member in this post, will print out schematic and do some testing .
thank you again for sharing your time and knowledge .
Cheers
Spike
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