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Old 24th December 2010, 01:50 AM   #1
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Default need help on treble distortion with my EAR834p phono

I am a new diyer and built a EAR834p couple months ago. It sounds great but has distortion (like overload) on high frequency loud vocal playback. I've tried replacing tubes, added volume control at input to lower the input level but didn't help. Can anyone advise what is the possible problem or method to trace the problem?

Many thanks for your help.
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Old 24th December 2010, 02:00 AM   #2
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Cartridge alignment?
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Old 24th December 2010, 02:14 AM   #3
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Quote:
Originally Posted by Miniwatt View Post
Cartridge alignment?
This is the first thing checked and found no issue.
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Old 24th December 2010, 02:16 AM   #4
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second the cartridge alignment/set-up. Also check your tip with magnifier for debris or damage.
What cartridge is it?
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Old 24th December 2010, 02:37 AM   #5
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Originally Posted by SGregory View Post
second the cartridge alignment/set-up. Also check your tip with magnifier for debris or damage.
What cartridge is it?
I've replaced the cartridge with a brand new dynavertor 17D3, got the same result
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Old 24th December 2010, 08:45 AM   #6
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Hi!

check all voltages and bias points if they are correct.

Also check if the RIAA is correct, this is best done by applying a signal from a signal generator through an inverse RIAA circuit to the input. Trace the signal from stage to stage and verify if it is within it's limits and if the freq response is correct at the output.

Best regards

Thomas
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Old 24th December 2010, 11:43 AM   #7
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Quote:
Also check if the RIAA is correct, this is best done by applying a signal from a signal generator through an inverse RIAA circuit to the input.
I think inverse RIAA corrector is quite rare in typical diyer's lab.
You can do the check of the frequency response of your amplifier simply by reading the relative voltage levels and comparing these with the RIAA table given below:

RIAA Curve
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Old 24th December 2010, 11:55 AM   #8
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Thanks for all your advice, have checked voltages and bias and did not realize any problem. Will go to component shop after holiday and build the I-RIAA.
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Old 26th December 2010, 03:54 PM   #9
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built the inverse RIAA and checked everything work fine. I also connect the CD player to the 834p through the inverse RIAA, no distortion.

So the problem should be related to cartridge or tonearm.

I've removed the tonearm from the TT, re-install it with all alignment being done from the very beginning. No improvement. I am using SME V + dynavector 17D3 + VPI TT. I also tried my old cartridge Blue point special, still have distortion but not as worse as 17D3.

Can anyone help me????
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