F1 question for NP

gl · 17th February 2006, 04:16 PM

Mr. Pass I have a question regarding the Gate connections on the input diff pair.

On a number of the more recent Zens and now on the F1 the bias resistors connect directly to the gates rather than to the outside terminal of the 221 ohm damper resistor. I understand that the damper resistor can be omitted if the impedance at the gate node is so low that oscillation isn't possible. A good example of this would be the lower CCS of the F1. However, the impedance on the Gates of the F1 diff pairs is quite high.

Heres my question:

Is there a sonic difference between connecting the bias resistors directly to the Gate as opposed to the outside end of the 221 ohm resistors?

Thank you.

Regards,
Graeme

Nelson Pass · 17th February 2006, 06:24 PM

It's really unimportant. The requirement is that there be a
minimum resistance before meeting a non-resistive component,
such as a capacitor or some part of a semiconductor. You can
attach arbitrarily high resistance values on the gate side or
the outside of this minimum resistance, and it doesn't make any
difference in a circuit like this.

gl · 17th February 2006, 06:30 PM

Thank you.

Graeme

17th February 2006, 04:16 PM	#1
gl diyAudio Member Join Date: Dec 2003 Location: Sierra Foothills - California	F1 question for NP Mr. Pass I have a question regarding the Gate connections on the input diff pair. On a number of the more recent Zens and now on the F1 the bias resistors connect directly to the gates rather than to the outside terminal of the 221 ohm damper resistor. I understand that the damper resistor can be omitted if the impedance at the gate node is so low that oscillation isn't possible. A good example of this would be the lower CCS of the F1. However, the impedance on the Gates of the F1 diff pairs is quite high. Heres my question: Is there a sonic difference between connecting the bias resistors directly to the Gate as opposed to the outside end of the 221 ohm resistors? Thank you. Regards, Graeme

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
newbie with input tran. question and wiring question	imo	Solid State	0	18th January 2006 10:10 PM
Capacitor Question /question on cap	TunaFish	Tubes / Valves	14	12th January 2004 02:23 AM
PS question - tformer question actually	breguetphile	Chip Amps	2	30th May 2003 01:29 PM
old speaker question, bullet midrange question & link to speaker project	wallijonn	Multi-Way	10	5th November 2002 06:03 AM

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


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

17th February 2006, 06:24 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	It's really unimportant. The requirement is that there be a minimum resistance before meeting a non-resistive component, such as a capacitor or some part of a semiconductor. You can attach arbitrarily high resistance values on the gate side or the outside of this minimum resistance, and it doesn't make any difference in a circuit like this.

17th February 2006, 06:30 PM	#3
gl diyAudio Member Join Date: Dec 2003 Location: Sierra Foothills - California	Thank you. Graeme

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