Page 23 of 23

Re: BA BA2 BA4 BAD Dual99v Build Thread

Posted: Thu Sep 05, 2019 2:23 am
by ylinjohto
[/quote]

Check the BA is fully working with NE5532A and input reg voltage is set to +30 to +36vdc on +V of the opamp sockets. If so you should be able to remove the NE5532A and fit 6 sockets and plug in the discrete opamp. Remember the discrete opamp is only driving the +out so link on dip socket is needed to put -out to 0v so quasi balanced out works.[/quote]

Opamp voltage is 24,1 and I guess that is ok because the Soun Skulptor sk99 is 24v op amp. I just need to clarify what exactly needs to be connected? 0V opamp socket to -output of the line output? Did I understood this correctly?

Thanks!

Re: BA BA2 BA4 BAD Dual99v Build Thread

Posted: Thu Sep 05, 2019 10:50 am
by Joe Malone
ylinjohto wrote:


Check the BA is fully working with NE5532A and input reg voltage is set to +30 to +36vdc on +V of the opamp sockets. If so you should be able to remove the NE5532A and fit 6 sockets and plug in the discrete opamp. Remember the discrete opamp is only driving the +out so link on dip socket is needed to put -out to 0v so quasi balanced out works.[/quote]

Opamp voltage is 24,1 and I guess that is ok because the Soun Skulptor sk99 is 24v op amp. I just need to clarify what exactly needs to be connected? 0V opamp socket to -output of the line output? Did I understood this correctly?

Thanks![/quote]

If sk99 is +/-24v you want the reg linked over so you have +48v on +V pin as the BA uses this 48v as +/-24v but 0v is referenced to -24v.

Re: BA BA2 BA4 BAD Dual99v Build Thread

Posted: Wed Sep 18, 2019 6:33 pm
by ylinjohto
Hi, Thank you for information!

I was wondering what is the output impedance of the unit. With JLM14 input tranfo and NE5532A op amp. Does DOA change output impedance?


Cheers

Re: BA BA2 BA4 BAD Dual99v Build Thread

Posted: Wed Sep 18, 2019 8:57 pm
by Joe Malone
ylinjohto wrote:Hi, Thank you for information!

I was wondering what is the output impedance of the unit. With JLM14 input tranfo and NE5532A op amp. Does DOA change output impedance?


Cheers


Balanced output impedance with NE5532A or discrete opamp no output transformer using +out and -out is 102ohm if using 51R or 66ohm if using 33R.