how to harman/kardon hd 970 sounds better

vujnovic zex · 5th August 2011, 08:52 PM

Help please.What can i do to my player to sound stronger?If i make some changes in i/v conversion(for example change resistor in negative feedback of op amps op 275) or some other change in output differential stage, will that make some difference(or something else )thanks

HornTube · 5th August 2011, 09:49 PM

Put some Sowjet tubes (6N6P on high current - not in SRPP mode) after the i/v section. Get rid of the diamond buffer output stage and all the 1000 parts. Use K75-16(24) caps for the tube signal section and there you go.

SoNic_real_one · 5th August 2011, 11:30 PM

Quote:

Originally Posted by vujnovic zex

What can i do to my player to sound stronger?

Use a "stronger" power amplifier than the current one?

HornTube · 5th August 2011, 11:48 PM

Quote:

Originally Posted by SoNic_real_one

Use a "stronger" power amplifier than the current one?

I think he means bolder/dynamics/body/drive/energy...

SoNic_real_one · 6th August 2011, 12:14 AM

First of all - look for the latest firmware update - V4.4. There are 2 different versions: one for the ones with the loader mechanism DSL710/720A and another for the loader mechanism DV345/HD65.
Second - the output stage is one of the best in this class of players. You can try different OpAmps instead of the original I/V (OP275), but that is already a very good OpAmp.
LM4562, AD8652 or even OPA1642.

PS: Using tubes as I/V stage will just cripple it.

vujnovic zex · 6th August 2011, 09:53 AM

thanks a lot

5th August 2011, 08:52 PM	#1
vujnovic zex diyAudio Member Join Date: Jan 2011 Location: belgrade	how to harman/kardon hd 970 sounds better Help please.What can i do to my player to sound stronger?If i make some changes in i/v conversion(for example change resistor in negative feedback of op amps op 275) or some other change in output differential stage, will that make some difference(or something else )thanks

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5th August 2011, 09:49 PM	#2
HornTube diyAudio Member Join Date: Nov 2009	Put some Sowjet tubes (6N6P on high current - not in SRPP mode) after the i/v section. Get rid of the diamond buffer output stage and all the 1000 parts. Use K75-16(24) caps for the tube signal section and there you go.

6th August 2011, 12:14 AM	#5
SoNic_real_one diyAudio Member Join Date: Jan 2008 Location: Virginia	First of all - look for the latest firmware update - V4.4. There are 2 different versions: one for the ones with the loader mechanism DSL710/720A and another for the loader mechanism DV345/HD65. Second - the output stage is one of the best in this class of players. You can try different OpAmps instead of the original I/V (OP275), but that is already a very good OpAmp. LM4562, AD8652 or even OPA1642. PS: Using tubes as I/V stage will just cripple it.

6th August 2011, 09:53 AM	#6
vujnovic zex diyAudio Member Join Date: Jan 2011 Location: belgrade	thanks a lot