Guys, I need your expert help. I have a Music Angel EL34 amp which has auto bias and has a very nice sound with the stock Chinese EL34 tubes.
I read that c6a7 tubes are direct replacement to EL34's so thinking that my system would be upgraded, I bought these PSVANE 6CA7-T MarkII tubes.
Upon arrival, I immediately plugged them in replacing the stock EL34 tubes.
Now I the weird thing is that the 6CA7 tubes created a very weird noise just after heating up even when my amplifier is at zero volume. So I just immediately turned off the amplifier and placed back the EL34 tubes which runs normal.
Could it be that these 6CA7 tubes are not compatible?
Thanks in advance..
I read that c6a7 tubes are direct replacement to EL34's so thinking that my system would be upgraded, I bought these PSVANE 6CA7-T MarkII tubes.
Upon arrival, I immediately plugged them in replacing the stock EL34 tubes.
Now I the weird thing is that the 6CA7 tubes created a very weird noise just after heating up even when my amplifier is at zero volume. So I just immediately turned off the amplifier and placed back the EL34 tubes which runs normal.
Could it be that these 6CA7 tubes are not compatible?
Thanks in advance..
Do you think so? I'm just wondering why they create this distorted sound coming from the left and right speakers.
The supplier claimed that these are brand new premium grade tubes. I sent an email to the supplier and I am waiting for their reply.
Could I file a paypal claim in case they refuse to rectify the problem?
Thanks,
The supplier claimed that these are brand new premium grade tubes. I sent an email to the supplier and I am waiting for their reply.
Could I file a paypal claim in case they refuse to rectify the problem?
Thanks,
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Do you think so?
I have no way to know that, ofcourse not
but I have experienced such with other things
you never know what goes on when money are at stake
not many I would trust when it comes to that
6CA7 is equivalent to EL34. However, it may be that some modern 6CA7/EL34 do not exactly follow the parameters of a traditional EL34. This should not be a problem for most amplifiers. A small bias change may be enough; if cathode resistor bias is used than this will be automatic.
What is the weird noise like?
Possibly it could be an oscillation. This could happen if grid-stop resistors are not used. And, it could be sensitive to what set of tubes is used. In which case nothing is wrong with the tubes, but rather there is a problem with the amp itself.
Possibly it could be an oscillation. This could happen if grid-stop resistors are not used. And, it could be sensitive to what set of tubes is used. In which case nothing is wrong with the tubes, but rather there is a problem with the amp itself.
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