K&K Audio / Lundahl Transformers

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Sakuma pp conversion

98.206.139.178
Posted on October 5, 2015 at 06:46:36
drdesmo
Audiophile

Posts: 32
Joined: March 10, 2003
 Hello Kevin, could you please recommend LL units to replace the custom Tamara's.
(re; input, interstage, output transformers)
I would like to use triode-connected KT120/KT150 in all locations, in place of the 845's.
I'm hoping to have enough gain with a tube-type preamp.

rgds, JL

 

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RE: Sakuma pp conversion, posted on October 5, 2015 at 12:20:31
KevinC
Manufacturer

Posts: 2984
Location: NC
Joined: April 19, 2001
 John,

The input transformer is 1:25. There is no Lundahl equivalent that will handle the level you will need there to achieve the goal of driving the first tube to a reasonable level, However, you could use the LL1689/PPZ connected for 1:18 there. The primary inductance with this connection is about 17H, which will require a low output impedance line stage to get good response across the audio band.

The interstage transformer is 1:1+1. The LL2746 has that configuration. Gapped for 70mA the LL2746 will have a primary inductance of 20H, which should be enough.

The output transformer that I normally use for PP KT120s is the LL1679/PP.


Kevin Carter
K&K Audio
www.kandkaudio.com

 

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