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
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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
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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
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
Leak Stereo 30 Plus goes pop!
... and not in a good way! My trusty Leak blew it's internal fuse this evening when I switched it on. I looked at the fuse and it was blackened. With the top cover off the amp, I fitted another fuse and powered on momentarily. There was a deep hum/vibration from the mains transformer. I was able to switch off before the fuse blew. Would I be correct in thinking that one of the rectifier diodes has gone s/c?
Steve
It's certainly a strong possibility- particularly with a notably distressed looking fuse! Easy to check and should be cheap to sort if it is shorted diode(s). The sort of thing where I'd not bother messing around if one or two have gone and just look out four beefier diodes or an amply rated integrated bridge- the world's your oyster here with ratings and packages.
Fingers crossed that there's no more distressed semiconductors further down the line....,
Colin
Shorted rectifier diodes are very common with these Leak Stereo and Delta transistor amps. My own Delta 30 that I was given in non-working condition in 1983 had exactly this problem.
If this is the cause, I'd replace all 4 diodes with 1N5404 for long term peace of mind.
John
It's never advisable to just replace one diode in a bridge. Any of the others could be stressed if one fails. They are so cheap you may as well change all four for higher rated types. Hopefully a nice easy fix.
Thanks all for your helpful replies. I was certainly contemplating replacing all four diodes and will plump for a brace of 1N5404s.
The amp was a £10 cheapie from last year's NVCF. I didn't expect it to work, but to my surprise it did and has kept me entertained for a year. It's sounded even better of late thanks to the acquisition of a pair of B&W DM4 speakers for £12.99 from the local charity shop.
Steve
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