K&K Audio / Lundahl Transformers

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K&K Audio / Lundahl Transformers

stereo 45 single-ended tube amp with LL2766 output transformer

207.102.78.6

Hi Kevin,

thanks for the introduction of the new small power LL2766 output transformer. I got the 50mA version of the OPT for 2 months. Finally I have got the amp completed during the past weekend. Few pictures in my facebook page:- https://www.facebook.com/groups/vancouverdiyaudio

To my surprise, the frequency response is very good. The high frequency -3dB is at 40KHz. The low end is flat down to 10Hz. It sounds big, powerful and dynamic.

I would say it is really money worth and it should meet your expectation. I look forward for the amorphous core version of it.

By the way, I would like to know what is the margin for the 30mA version of this transformer. Can it handle idle current of 35mA?

Johnny

Follow Ups:

RE: stereo 45 single-ended tube amp with LL2766 output transformer - beeah 11:29:48 08/14/18 (1)
Hi Kevin,

Are the LL2766 available for sale? I'm in the beginning stages of sourcing parts for my fourth 45 SE amp, and these are very appealing - especially given Johnny's measurements.

Cheers,
Joe
- RE: stereo 45 single-ended tube amp with LL2766 output transformer - KevinC 13:19:39 08/14/18 (0)
  Yes, they are available. I stock the 30mA, 40mA, and 50mA variants.
  
  Kevin Carter
  K&K Audio
  www.kandkaudio.com
RE: stereo 45 single-ended tube amp with LL2766 output transformer - KevinC 10:51:30 05/23/18 (0)
Thanks for the feedback Johnny. Sounds like a really good result!

Running about 15% more current through the primary than it is gapped for will significantly reduce the maximum output power compared to the specification in the data sheet. If you are using a 45 or 2A3 sort of tube it's not an issue, though, because either of these are well shy of the 6w power rating.

Kevin Carter
K&K Audio
www.kandkaudio.com

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