output bias servo

ErikdeBest · 1st October 2006, 11:43 PM

Question to all owners of Valve amplifiers, 3rd. edition!

I am looking at Morgan Jones's output bias servo, presented on page 420. Besides being interested in other people experiences with those kind of servos, I am wondering if I could use a dual opamp in a single package. I know there is some difference between them, but I have no idea what, and how it would influence performance of the servo. The design asks for a 5534 and a 071, the first being a "low noise OPAMP", the second a 'low noise, J fet input".

I want to use a single package because I want to make the PCB as small as possible. I could be either a 5532 or a 072, both are cheap!

Many thanks for the attention

Erik

Geek · 2nd October 2006, 01:27 AM

Hi,

Yes, I did a Broskie style autobias using the 4558 dual opamp.
http://geek.scorpiorising.ca/GeeK_Zo...p?topic=1728.0

1st October 2006, 11:43 PM	#1
ErikdeBest mostly thinkerer diyAudio Member Join Date: Mar 2003 Location: Maputo - Mozambique	output bias servo Question to all owners of Valve amplifiers, 3rd. edition! I am looking at Morgan Jones's output bias servo, presented on page 420. Besides being interested in other people experiences with those kind of servos, I am wondering if I could use a dual opamp in a single package. I know there is some difference between them, but I have no idea what, and how it would influence performance of the servo. The design asks for a 5534 and a 071, the first being a "low noise OPAMP", the second a 'low noise, J fet input". I want to use a single package because I want to make the PCB as small as possible. I could be either a 5532 or a 072, both are cheap! Many thanks for the attention Erik

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2nd October 2006, 01:27 AM	#2
Geek diyAudio Member Join Date: Sep 2004	Hi, Yes, I did a Broskie style autobias using the 4558 dual opamp. http://geek.scorpiorising.ca/GeeK_Zo...p?topic=1728.0