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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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12th Sep 2019, 4:34 pm | #1 |
Tetrode
Join Date: Sep 2016
Location: Tring, Hertfordshire, UK.
Posts: 87
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Leak Delta AM-FM Tuner
I wish to listen to the MW ( 5 Live for sport ) and have found my old Tuner which has not been used for at least 10 years.
The FM side works well but the AM side is totally dead. Its gives me the feeling that perhaps the power is not being switched to the AM tuner circuit. Does any one have a schematic for this Tuner and has anyone experienced this fault. Mike |
12th Sep 2019, 4:46 pm | #2 |
Moderator
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,787
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Re: Leak Delta AM-FM Tuner
ElektroTanya appears to have a service manual: https://elektrotanya.com/leak_delta_.../download.html
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15th Sep 2019, 8:41 am | #3 |
Tetrode
Join Date: Sep 2016
Location: Tring, Hertfordshire, UK.
Posts: 87
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Re: Leak Delta AM-FM Tuner
Thanks Paul.
Making a start this week. |
15th Sep 2019, 10:42 am | #4 |
Dekatron
Join Date: Oct 2003
Location: Croydon, Surrey, UK.
Posts: 7,549
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Re: Leak Delta AM-FM Tuner
Try cleaning the wavechange switch first.
__________________
There are lots of brilliant keyboard players and then there is Rick Wakeman..... |
15th Sep 2019, 12:09 pm | #5 |
Hexode
Join Date: Jan 2013
Location: Kelvedon, Essex, UK.
Posts: 272
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Re: Leak Delta AM-FM Tuner
Most of the blue electrolytics will have gone leaky to some degree. Especially the two AF o/p coupling caps, these go leaky and can feed up to 700mv dc to the i/p of your amp. Not good for a dc coupled amp.
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18th Sep 2019, 8:03 am | #6 |
Tetrode
Join Date: Sep 2016
Location: Tring, Hertfordshire, UK.
Posts: 87
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Re: Leak Delta AM-FM Tuner
Nothing more than resistor gone high and a reset of the power supply.
One bulb to replace and a change of the two output caps when they arrive. Now onto it's Delta 70 brother. Thanks for your help. |
18th Sep 2019, 9:04 am | #7 |
Dekatron
Join Date: Sep 2003
Location: Near Swindon, North Wiltshire, UK.
Posts: 3,595
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Re: Leak Delta AM-FM Tuner
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22nd Sep 2019, 9:28 am | #8 |
Tetrode
Join Date: Sep 2016
Location: Tring, Hertfordshire, UK.
Posts: 87
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Re: Leak Delta AM-FM Tuner
R1 on the AM board which should be 330k was well above 2M.
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