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Need Help with PSVANE 6CA7-T
Need Help with PSVANE 6CA7-T
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Old 21st October 2013, 02:37 PM   #1
sdcz is offline sdcz
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Default Need Help with PSVANE 6CA7-T

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..
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Old 21st October 2013, 03:11 PM   #2
tinitus is offline tinitus  Europe
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Need Help with PSVANE 6CA7-T
maybe they are 'recycled' tubes

meaning they might have been returned and shipped again
and maybe more than once
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Old 21st October 2013, 03:13 PM   #3
sdcz is offline sdcz
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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,

Last edited by sdcz; 21st October 2013 at 03:16 PM.
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Old 21st October 2013, 03:18 PM   #4
tinitus is offline tinitus  Europe
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Need Help with PSVANE 6CA7-T
Quote:
Originally Posted by sdcz View Post
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
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Old 21st October 2013, 03:20 PM   #5
sdcz is offline sdcz
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My worry is that maybe my EL34 amplifier is not compatible with 6CA7 tubes.
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Old 21st October 2013, 03:26 PM   #6
tinitus is offline tinitus  Europe
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Need Help with PSVANE 6CA7-T
maybe question whether your stock chinese 'EL34' actually are EL34, or whether those 6CA7 actually are 6CA7

or maybe neither of them are
I would certainly question that
and I don't even know anything either

maybe someone else can help you better
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Old 21st October 2013, 03:29 PM   #7
DF96 is offline DF96  England
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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.
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Old 21st October 2013, 03:37 PM   #8
TheGimp is offline TheGimp  United States
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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.
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Old 21st October 2013, 03:51 PM   #9
kevinkr is offline kevinkr  United States
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Need Help with PSVANE 6CA7-T
I agree with Gimp..
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Old 21st October 2013, 04:36 PM   #10
sdcz is offline sdcz
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The noise are like scratching sounds.
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