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Old 2nd November 2009, 07:48 PM   #11
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here the appropriate terms and keywords to get the widest range of informations about "Google":
1) Radio Frequency Interference (RFI)
2) Radio Interference Damper (or Damping, RFD)
two examples:
RFI Information Page
AudiogoN Forums: Radio interference on my phono stage
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Old 4th November 2009, 11:32 AM   #12
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Andreas - have you put an oscilloscope at the output of the preamp to check that it's not oscillating? The only times I've seen RIAA preamps pick up radio has been when they're oscillating at 20+ mHz

Justin
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Old 4th November 2009, 02:53 PM   #13
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Quote:
Originally Posted by thermionic View Post
Andreas - have you put an oscilloscope at the output of the preamp to check that it's not oscillating? The only times I've seen RIAA preamps pick up radio has been when they're oscillating at 20+ mHz Justin
sometimes this was the reason. But in some other cases only the faulty screening management causes this, and for this case I need an equivalent circuit to understand all the parasitic AM radio effects.

Please note, that I haven't this problem by a certainly RIAA head amp model, but I want to know the exactly relationships, if there are no hum and only short wafe (SW) radio stations to hear, especially when there are strong reflections of the ionosphere arround 6 MHz/AM

Last edited by tiefbassuebertr; 4th November 2009 at 03:00 PM.
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Old 16th September 2012, 12:14 PM   #14
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A friend of me told me, that he hears in high volume short-wave transmitter stations in italian language while playback of vinyl long play records (but no hum and noise).
I suggested, that he should pull the tonarm cable from his preamp. Instead this he should put in two RCA/cinch connectors without external cable, but with an internal short wire (jumper) between the inner terminal and the outer side of the connector.
He noted after doing this, that the unwanted short-wave reception is still present. However - by open phono input sockets he note, that only noise is heard.
This means for me clearly, that the record player include the arm and cable isn't the reason for this unwanted effect.

The preamp is the VTL Maximal - go to post #1 about
Schematic wanted for VTL Preamp "Maximal"

Perhaps this unwanted effect is good known by other users from the same model and thus there are already several efforts known to create the remedy.

Thank you very much for advices.
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