Lundahl LL1527 phase-splitter

Klimon · 22nd December 2007, 07:37 PM

Is Lundahl LL1527 suited as input phase-splitter for a 'hifi' amp? Say 2V input signal and 6sn7 as load.

thanks!!

Simon

KevinC · 22nd December 2007, 09:15 PM

The LL1527 will work, but there are other more suitable transformers in the Lundahl catalog. The LL1592 is the best choice with a mu metal core and the LL1690 is the best with a cobalt amorphous core. These can be used 1+1:1+1 and 1:1+1 (with the primary coils in parallel) for phase splitting.

SY · 23rd December 2007, 01:23 AM

Whichever you use, do try to optimize the loading, taking into account the input and Miller capacitance of the 6SN7 and the source impedance of your preamp. Usually, diddling the value of the resistive load on the secondary and/or using a Zobel will greatly clean up the time domain behavior.

KevinC · 23rd December 2007, 01:41 AM

But if you do endeavor to fiddle with loading, listen as you do it. Not all transformer loading networks that look good on the scope sound good to the ear.

Klimon · 23rd December 2007, 09:05 AM

1527 suits my lack of budget best

I'll keep the zobel idea in mind; thanks for the replies

Simon

Shoog · 23rd December 2007, 06:12 PM

I would agree with SY, these babies can ring and overshoot like crazy. I have about 300K load on each of my secondaries, and that cleaned up the top end a load.

Shoog

22nd December 2007, 07:37 PM	#1
Klimon diyAudio Member Join Date: Apr 2005 Location: Leuven	Lundahl LL1527 phase-splitter Is Lundahl LL1527 suited as input phase-splitter for a 'hifi' amp? Say 2V input signal and 6sn7 as load. thanks!! Simon

22nd December 2007, 09:15 PM	#2
KevinC diyAudio Member Join Date: Feb 2003 Location: central NC	The LL1527 will work, but there are other more suitable transformers in the Lundahl catalog. The LL1592 is the best choice with a mu metal core and the LL1690 is the best with a cobalt amorphous core. These can be used 1+1:1+1 and 1:1+1 (with the primary coils in parallel) for phase splitting. __________________ Kevin Carter K&K Audio, www.kandkaudio.com

23rd December 2007, 01:23 AM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Whichever you use, do try to optimize the loading, taking into account the input and Miller capacitance of the 6SN7 and the source impedance of your preamp. Usually, diddling the value of the resistive load on the secondary and/or using a Zobel will greatly clean up the time domain behavior. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

23rd December 2007, 01:41 AM	#4
KevinC diyAudio Member Join Date: Feb 2003 Location: central NC	But if you do endeavor to fiddle with loading, listen as you do it. Not all transformer loading networks that look good on the scope sound good to the ear. __________________ Kevin Carter K&K Audio, www.kandkaudio.com

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23rd December 2007, 09:05 AM	#5
Klimon diyAudio Member Join Date: Apr 2005 Location: Leuven	1527 suits my lack of budget best I'll keep the zobel idea in mind; thanks for the replies Simon

23rd December 2007, 06:12 PM	#6
Shoog diyAudio Member Join Date: Aug 2002 Location: Eire	I would agree with SY, these babies can ring and overshoot like crazy. I have about 300K load on each of my secondaries, and that cleaned up the top end a load. Shoog

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