AR LST Crossover

[Pip Lewis]

Greetings,
I am building a replica pair of AR LST speakers, as it's what some old people do in retirement.

In the crossover, I can't find any info on the auto-transformer that is part of the attenuation "presets" for each driver.
There are 6 selections available, via a selector and each one changes the filter characteristics for each driver.
The schematic just shows the auto-former with -1 to -6db taps.

Does anyone know the specifications of this auto-former so a new pair can be wound?
Or does anyone have an old one for sale?

Any help is much appreciated. PL.

 

[Inductor]

Use standard pots/resistors arrangements for both tweeters and mids until you can put your hands on the right autotransformers.

 

[sreten]

Hi,

The -6dB tap is 50% of the winding and the rest are easy to calculate.
-1dB, 89%, -2dB, 79%, -3dB 71%, -4dB 63%, -5dB 56%.

rgds, sreten.

 

[QSerraTico_Tico]

buy these:
www.ebay.de
#221322315093

 

[Pip Lewis]

Thanks guys, much appreciated

 

[Inductor]

You're welcome. It's a nice speaker, not for all. I know there are some old threads and notes on this ar-LST or Cello Amati models, I don't know if you found it in a forum search. Have fun.