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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
Ferguson 3V24 De-Robed
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
Philips G17T320
Apologies if you already know this.
The original cap was rated at 1500VDC. If the replacement cap is listed as 700VAC then the rule of thumb is roughly 3 x VAC rate, for VDC rate. So in this case the 700VAC will be fine at 2100VDC more than adequate for your needs.
Not sure if that answers your query.
e.g. I replaced a Dubilier 0.47 1500VDC with a poly 0.47 500VAC on a PYE 697, perfectly acceptable.
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Seems reasonable. I think you actually multiply the 700Vac by 2.8 if I remember what Philips said (so 3 is near enough...and easier to work out)! That would give 1960 volts DC which is still way over the original rating so no problems with your replacement.
Posted by: sidebandSeems reasonable. I think you actually multiply the 700Vac by 2.8
Correct; 2 times the square root of 2.
Thanks for your replies. My question was asked because I wasn't sure about the relationship between AC rating and pulse voltage. I am familiar with the ac and dc ratings of caps but not the dynamics of pulses. You all have a much deeper knowledge than myself.
Jonathan
A range of capacitors for AC and pulse circuits, mainly polypropylene for your info.
https://www.vishay.com/capacitors/film/ac-pulse/tab/products/
Frank
Final,(I hope) update on this set. After being very distracted I have finally fitted a correct type of harmonic tuning cap to the line o/p circuit.
I had only ever run this set with a temporary ceramic cap and concluded after much searching that the high voltage and scan problems were due to a replacement LOPT having been fitted from an earlier set. These transformers required a 2.7nf cap instead of this model's 2.2nf. Adding extra ceramic capacity brought everything into spec and I thought the issue was sorted.
Just before I fitted the new cap I had watched a Youtube video about ceramic caps and as a result I first tried the original value of 2.2nf - to be rewarded by a set operating perfectly and with loads of width to spare.
Several of you had suggested that I should not run the set on ceramics and you were right! The concept of caps changing their values drastically with applied voltages is new to me and in case it's of interest to anyone else take a look (link below)
Another lesson learned on my journey.
Jonathan.
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