wojtek
03-12-2017, 00:46
Hi everyone,
As someone who is still an ingénue in the world of valves and turntables, I would very much value your opinion on what might have caused the following.:
I recently bought a valve preamplifier with reputably an excellent MM phono stage ( a leben rs28cx). I bought it privately, it had been serviced in the past year, and played wonderfully well when I compared it with my graham slee phono stage. It was silent, with some hum from my speakers being from my papworth TVA 10 power amp, and no change on switching the pre amp on / off.
Today I tried changing cartridges to an old Ortofon I had bought on another forum some months back. The headshell cables were a little stiff. I don’t really know what I’m doing yet, but I connected the new cartridge and screwed it in. On switching on the turntable, I initially had sound coming from one speaker only and perhaps a little noise. I thought to tweak the headshell cables, which I did whilst everything was switched on. This caused some noise ,but nothing that sounded damaging. It then played fine, and the cartridge sounded great.
Howerver, on finishing the record, I now find the phono stage is quite noisy when selected, with occasional soft popping sounds and a bit of hum that sounds like when the ground is not connected. Disconnecting the phono cables helps, but not completely. More worryingly, there is now a bit of soft, steady noise audible through the speakers when the preamp is switched on. I’m pretty certain this was absent before, it's not audible when music is playing.
Obviously I will need to go to an appropriate hifi dealer, but any thoughts as to what I might have damaged here? Thanks!
p.s. since buying the preamp, a local dealer explained he had originally sold it to the seller, but that it had some noise/hum in the phono stage. This was definitely not the case when I first got it, so presumably it had been fixed by servicing.
As someone who is still an ingénue in the world of valves and turntables, I would very much value your opinion on what might have caused the following.:
I recently bought a valve preamplifier with reputably an excellent MM phono stage ( a leben rs28cx). I bought it privately, it had been serviced in the past year, and played wonderfully well when I compared it with my graham slee phono stage. It was silent, with some hum from my speakers being from my papworth TVA 10 power amp, and no change on switching the pre amp on / off.
Today I tried changing cartridges to an old Ortofon I had bought on another forum some months back. The headshell cables were a little stiff. I don’t really know what I’m doing yet, but I connected the new cartridge and screwed it in. On switching on the turntable, I initially had sound coming from one speaker only and perhaps a little noise. I thought to tweak the headshell cables, which I did whilst everything was switched on. This caused some noise ,but nothing that sounded damaging. It then played fine, and the cartridge sounded great.
Howerver, on finishing the record, I now find the phono stage is quite noisy when selected, with occasional soft popping sounds and a bit of hum that sounds like when the ground is not connected. Disconnecting the phono cables helps, but not completely. More worryingly, there is now a bit of soft, steady noise audible through the speakers when the preamp is switched on. I’m pretty certain this was absent before, it's not audible when music is playing.
Obviously I will need to go to an appropriate hifi dealer, but any thoughts as to what I might have damaged here? Thanks!
p.s. since buying the preamp, a local dealer explained he had originally sold it to the seller, but that it had some noise/hum in the phono stage. This was definitely not the case when I first got it, so presumably it had been fixed by servicing.