K&K Audio / Lundahl Transformers

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Stereo to Mono with LL1660 outputs

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Posted on February 19, 2022 at 15:56:11
RobberttheDutch
Audiophile

Posts: 2
Location: Nashville
Joined: February 19, 2022
 I have an RIAA preamp Stereo with LL1660 at the output. Both (left and right channel)secondary windings are floating.

My question is how can I make a mono signal from this:

Option A: Connect both grounds of the LL1660 output, put a 5K resistor in both signal lines and combine these resistors to a mono signal.

OR

Option B: I keep the secondary's of both LL1660 floating and connect them in series.

What would be the best option?

I am just starting with transformers, really like the sound and the less complexity with ground issues, and less capacitors in the signal path.

Thanks

Robbert

 

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RE: Stereo to Mono with LL1660 outputs, posted on April 2, 2022 at 08:34:32
WntrMute2
Audiophile

Posts: 787
Location: Detroit
Joined: September 16, 2002



This is how I did it. Works fine on multiple different phono-stages including the K&K.

 

RE: Stereo to Mono with LL1660 outputs, posted on April 2, 2022 at 13:19:43
RobberttheDutch
Audiophile

Posts: 2
Location: Nashville
Joined: February 19, 2022
 Thanks WntrMute2, Yes I have used your schematic often.
Currently I am making a MONO signal from my RIAA pre pre using the LL1660 outputs in series.
I am not sure but I believe especially when left and right is very different in sound level it sounds more homogeneous.
It can also be that my mind is playing tricks with my ears or the other way around. :-)

For my DAC out put I am currently thinking of putting in each signal path an LL1690 and strap the outputs also in series to make a mono signal.

Kevin is helping me out getting some detailed info from Sweden.

All happy listening.

 

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