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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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12th Dec 2019, 12:00 am | #1 |
Octode
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,307
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Dynatron HFC51 volume change
Hi,
I have a Dynatron HFC 51, which I've had for a couple of years now, but recently I've started having issues with audio. The audio level can suddenly change, it usually gets louder, then stay at it's louder level for a few minutes, then drop again, to a quiet level. The left channel is also unusable as it gives a very loud distorted noise, this happens through both headphones, and the loud speakers. I have had the distortion issue for a while now, but it was very quiet, and only noticeable with no music, but it now overpowers the music. I did search for a diagram and found one online, but it's too much for what I can afford. The player uses a Dynatron SA29 "chassis" (I don't know if that's the term for record players) I guess it's something in the amplifier section? Thanks |
12th Dec 2019, 8:17 am | #2 |
Octode
Join Date: Feb 2009
Location: Wallasey, UK.
Posts: 1,311
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Re: Dynatron HFC51 volume change
Hi, this thread may help you somewhat https://www.vintage-radio.net/forum/...d.php?p=485094
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12th Dec 2019, 11:38 pm | #3 |
Octode
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,307
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Re: Dynatron HFC51 volume change
Hi,
Thank you, for linking that, i'll get to reading it now Thanks |
13th Dec 2019, 12:52 pm | #4 |
Dekatron
Join Date: Sep 2015
Location: Southwold, Suffolk, UK.
Posts: 8,327
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Re: Dynatron HFC51 volume change
Failure of one Channel in these is a very common problem. What is your skill level in fault finding/voltage measuring on old equipment such as this?
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Edward. |
14th Dec 2019, 12:48 am | #5 |
Octode
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,307
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Re: Dynatron HFC51 volume change
Hi,
I'm so-so with fault finding, I have some limited experience and know-how, with some guidance I can do it I'm not too great at following schematics and diagrams, although. Thanks |
14th Dec 2019, 2:26 pm | #6 |
Triode
Join Date: Dec 2019
Location: London, UK.
Posts: 23
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Re: Dynatron HFC51 volume change
I'm going to go right out on a limb here, since I am unskilled and incompetent at electronics - but I have a Sony HMK-80B which has a similar problem, and I believe it to be caused by a failing volume pot together with poor contacts at the headphone socket...
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14th Dec 2019, 4:34 pm | #7 |
Dekatron
Join Date: Sep 2015
Location: Southwold, Suffolk, UK.
Posts: 8,327
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Re: Dynatron HFC51 volume change
A Volume Pot does not actually "fail" enough to impair volume - but the track does get worn so that over time, the volume may become intermittent, but not necessarily reduced in amplitude.
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Edward. |
15th Dec 2019, 5:50 pm | #8 |
Octode
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,307
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Re: Dynatron HFC51 volume change
Hi,
the volume changes on both channels, but the heavy distortion is from the left channel only, so it could possibly be the volume control, it's a slider and I think these had their problems, but I think the volume drops, and then raises to its normal level, so i'm not sure Thanks |