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| Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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Thread Tools |
30th Apr 2019, 7:39 pm
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#1 |
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Triode
Join Date: Oct 2013
Location: Leicester, Leicestershire, UK.
Posts: 24
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Reception Set R109
My R109 had its capacitors replaced a few years ago and has been working fine. Recently the volume control has not worked -it's stuck on full volume. I have tested the 1 meg pot and it measures up OK. I have even substituted a new one in its place and it's the same scenario. What should I be looking for to fix it?
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30th Apr 2019, 8:25 pm
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#2 |
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Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,932
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Re: Reception Set R109
Is there a resistor in series with the vol pot.Or one end is not to ground.
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G8JET BVWS Archivist and Member V.M.A.R.S |
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30th Apr 2019, 9:53 pm
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#3 |
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Triode
Join Date: Oct 2013
Location: Leicester, Leicestershire, UK.
Posts: 24
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Re: Reception Set R109
There are several 1 meg resistors in the lines to the volume pot.I will check the values and replace as necessary.
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1st May 2019, 10:09 am
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#4 |
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Pentode
Join Date: Mar 2013
Location: Leeds, West Yorkshire, UK.
Posts: 246
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Re: Reception Set R109
A point worth noting the vol pot goes to "HT -ve" not earth/ chassis. The circuit is avalible on line at "VMARS"
regards S-W |
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1st May 2019, 11:05 am
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#5 |
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Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,932
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Re: Reception Set R109
Thank you for that, I did not look at the circuit.
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G8JET BVWS Archivist and Member V.M.A.R.S |
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3rd May 2019, 9:28 pm
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#6 |
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Triode
Join Date: Oct 2013
Location: Leicester, Leicestershire, UK.
Posts: 24
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Re: Reception Set R109
Volume control now working. In the grid voltage supply line the 1 meg R1k resistor needed replacing.
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