krad
Prospect
Posts: 4
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Post by krad on Nov 13, 2022 20:57:09 GMT
My Radford SC22 STA25 system has developed a harsh sound when playing cd's. The treble is accentuated. Could the valves in the pre-amp be a possible cause?
Should I swap the ECC83's in the preamp?
Radford SC22 STA25 system
Luxman L114A Amplifier
Luxman L112 Stereo Radio Tuner
Tannoy Gold Loudspeakers
Pioneer PDsO2 Compact Disc Player
Thorens TD24 Record Player
Panasonic NV F70 HQ VHS Recorder
Technics ST-G3S Stereo Radio Tuner
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Bigman80
Grandmaster
The HiFi Bear/Audioaddicts/Bigbottle Owner
Posts: 16,398
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Post by Bigman80 on Nov 13, 2022 21:03:10 GMT
My Radford SC22 STA25 system has developed a harsh sound when playing cd's. The treble is accentuated. Could the valves in the pre-amp be a possible cause? Should I swap the ECC83's in the preamp? Radford SC22 STA25 system Luxman L114A Amplifier Luxman L112 Stereo Radio Tuner Tannoy Gold Loudspeakers Pioneer PDsO2 Compact Disc Player Thorens TD24 Record Player Panasonic NV F70 HQ VHS Recorder Technics ST-G3S Stereo Radio Tuner Hi Krad, Welcome to the forum! This section is to introduce yourself a little, but no probs that you have asked a Q Any harshness with vinyl? |
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krad
Prospect
Posts: 4
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Post by krad on Nov 13, 2022 21:09:26 GMT
I haven't tried vinyl.
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Post by rexton on Nov 13, 2022 21:12:17 GMT
How old are the ECC83's? Are they 2nd hand?
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krad
Prospect
Posts: 4
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Post by krad on Nov 13, 2022 21:22:06 GMT
They are old but I still have a number of unused ones I can use.
I was going to swap them but wondered what affect they could have on the sound quality.
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Post by rexton on Nov 13, 2022 21:31:30 GMT
I think you've answered your own question. Just swap them and see what happens, what's the worst that can happen ?
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Post by bencat on Nov 14, 2022 12:14:55 GMT
Before you change anything I would try a few of the other sources first . If the harshness is showing on all of the sources then this would point to the pre and power being the source . If it stays just with CD then switch the CD line input channel . If the issue follows the CD then it is most likely the player causing the fault because you will have already checked another source in that input and not heard the same issue . If the harshness stops with another input then it is likely to be in the line stage on the Radford and you can then narrow down which are the valves you need to look at .
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Post by macca on Nov 14, 2022 21:25:01 GMT
If it is a dodgy valve you might be able to see it doing weird stuff once it warms up. Valves in the power amp will have a shorter life so more likely to be one of those but could be the pre-amp.
If it's not the valves then will likely be a faulty component in pre or power. Least likely to be the CD player at fault.
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Post by electronumpty on Nov 14, 2022 21:44:52 GMT
If it is the same with all sources and still there after valve swaps then think about the Tannoys xovers if they are still original, they may benefit from recapping. They can be a bit peaky.
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Post by radfordrevival on Nov 17, 2022 11:56:18 GMT
It's quite possible that the CD player is overloading the aux inputs as they are only 100mV vs the CD's 2V!
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Post by macca on Nov 17, 2022 18:23:09 GMT
It's quite possible that the CD player is overloading the aux inputs as they are only 100mV vs the CD's 2V! was assuming it sounded fine previously and that the harshness is a new development, but it could be the issue if not. |
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Post by radfordrevival on Nov 17, 2022 19:09:53 GMT
True! But connecting a CDP player directly to one of the inputs can definitely overload it to the point of audible distortion - some variants of the SC22 only have the gain controls operating the phono stage and some had it functional across all inputs. Variants with the fixed gain inputs will definitely overload
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