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| Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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19th Jun 2017, 12:39 am
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#1 |
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Triode
Join Date: Jan 2015
Location: Stafford, Staffordshire, UK.
Posts: 26
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Quad FM3 problem
Hi all.
Managed to buy a cheap Quad FM3 radio tuner last week. It sounds lovely but when its been on for an hour it suddenly starts going very quiet. If I unplug it and plug it back in again it is fine for a while then does it again, Any ideas please? |
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19th Jun 2017, 8:01 am
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#2 |
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Hexode
Join Date: Jun 2011
Location: Glossop, Derbyshire, UK.
Posts: 487
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Re: Quad FM3 problem
Hi this is the FM3 user manual with the cct diagram hope it helps
Dave
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Any tool can be used as a hammer but a screwdriver makes the best chisel |
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19th Jun 2017, 11:19 am
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#3 |
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Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,286
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Re: Quad FM3 problem
I would suggest measuring the +14V and -14V supply lines with the fault present and not present.
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
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19th Jun 2017, 12:07 pm
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#4 |
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Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,841
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Re: Quad FM3 problem
Have you tried twiddling with the "Mute threshold" preset on the back when the fault's present?
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20th Jun 2017, 3:37 pm
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#5 |
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Heptode
Join Date: Jun 2017
Location: Southport, Merseyside, UK.
Posts: 646
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Re: Quad FM3 problem
Hello.
I had a range of Quad items from the valve and early transistor period. When I needed information years later, I found by calling Quad they were very willing to provide advice and information sheets. If the company is still trading it may be worth giving them a call. |
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20th Jun 2017, 9:49 pm
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#6 |
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Triode
Join Date: Jan 2015
Location: Stafford, Staffordshire, UK.
Posts: 26
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Re: Quad FM3 problem
OK thank you
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21st Jun 2017, 8:07 am
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#7 |
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Hexode
Join Date: Jun 2011
Location: Glossop, Derbyshire, UK.
Posts: 487
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Re: Quad FM3 problem
Hi I do have the service manual on PDF but it is too large to post here PM me with an E-mail address and I will send it to you
Dave 
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Any tool can be used as a hammer but a screwdriver makes the best chisel |
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