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Sony ST 70 tuner - no AM response?

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Sony ST 70 tuner - no AM response?

Postby perchman » 09 Oct 2017 19:42

Hi all

Just picked up a lovely Sony ST70 and matching amp, nice retro look and feel and in great order apart from the fact that i cannot get anything out of the AM side.

FM is working fine but not being either an expert on tuners or electronics im struggling having now checked all the basics.

Any thought on how to proceed next would be very much appreciated.
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Re: Sony ST 70 tuner - no AM response?

Postby Alec124c41 » 10 Oct 2017 14:44

Is there an antenna attached?

Cheers,
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Re: Sony ST 70 tuner - no AM response?

Postby perchman » 12 Oct 2017 19:55

Yes, an internal am antenna and i have also had an external attached
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Re: Sony ST 70 tuner - no AM response?

Postby davidsrsb » 15 Oct 2017 04:48

Is there MW broadcast in the UK these days?
Long gone in Malaysia as MW transmitters use far more electricity than FM.
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Re: Sony ST 70 tuner - no AM response?

Postby bernard1 » 20 Oct 2017 10:48

Hello,
When you switch to AM, do you hear noise (white, pink, or whatever colour you like), or nothing at all ? It could be a tuning problem, or the the AM stage could be faulty.
This page has some info on AM broadcasting in UK :
http://www.bbc.co.uk/reception/radio/am_lw_radio
Note that "It is likely that AM broadcasting in the UK will cease at some point in the future to be determined by the Government, though no date has yet been given."
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Re: Sony ST 70 tuner - no AM response?

Postby perchman » 20 Oct 2017 14:40

Nothing all all comes through, completely dead on the AM side of things
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Re: Sony ST 70 tuner - no AM response?

Postby Sunwire » 17 Nov 2017 03:14

There is a very active Yahoo group devoted to radio tuners.
The main focus is FM, but most tuners are AM/FM like the ST70 and the group includes a number of highly qualified techs who may be able to help troubleshoot your problem.

https://groups.yahoo.com/neo/groups/FMtuners/info
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