need help on treble distortion with my EAR834p phono

bigpandahk · 24th December 2010, 12:50 AM

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.

Miniwatt · 24th December 2010, 01:00 AM

Cartridge alignment?

bigpandahk · 24th December 2010, 01:14 AM

Quote:

Originally Posted by Miniwatt

Cartridge alignment?

This is the first thing checked and found no issue.

SGregory · 24th December 2010, 01:16 AM

second the cartridge alignment/set-up. Also check your tip with magnifier for debris or damage.
What cartridge is it?

bigpandahk · 24th December 2010, 01:37 AM

Quote:

Originally Posted by SGregory

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

Vinylsavor · 24th December 2010, 07:45 AM

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

artosalo · 24th December 2010, 10:43 AM

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

bigpandahk · 24th December 2010, 10:55 AM

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.

bigpandahk · 26th December 2010, 02:54 PM

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????

24th December 2010, 12:50 AM	#1
bigpandahk diyAudio Member Join Date: Jul 2009	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.

24th December 2010, 01:16 AM	#4
SGregory Tubie Noobie diyAudio Member Join Date: Apr 2003 Location: Southern Tier NY	second the cartridge alignment/set-up. Also check your tip with magnifier for debris or damage. What cartridge is it? __________________ Living Life Doing the Waltz in 4/4 meter.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Fixing Phono Preamp Distortion due to Impedance Nonlinearity	fftulip	Analogue Source	18	8th December 2010 07:37 AM
scratch build EAR834p	fallendragon	Tubes / Valves	0	5th April 2008 02:47 PM
help treble	tadiam	Chip Amps	4	26th August 2007 10:44 PM
simple guitar preamp with bass treble distortion	garydmd	Chip Amps	0	7th April 2007 03:27 AM
Turntable / Phono Preamp Distortion	Kofi Annan	Analogue Source	30	12th September 2004 02:12 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

24th December 2010, 01:00 AM	#2
Miniwatt diyAudio Member Join Date: Nov 2004 Location: Den Haag	Cartridge alignment?

24th December 2010, 07:45 AM	#6
Vinylsavor diyAudio Member Join Date: Feb 2002 Location: Lindau	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

24th December 2010, 10:55 AM	#8
bigpandahk diyAudio Member Join Date: Jul 2009	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.

26th December 2010, 02:54 PM	#9
bigpandahk diyAudio Member Join Date: Jul 2009	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????

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)