K&K Audio / Lundahl Transformers

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ultra-linear

71.210.56.90
Posted on June 22, 2015 at 11:37:01
thermionic addictions
Audiophile

Posts: 894
Joined: June 16, 2006
 Kevin

Are there any transformers in your lineup that could give me SE, ultra-linear
operation @ around 8k with 43% taps? It would be used with a 47 tube so very low wattage.

Cal

 

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RE: ultra-linear, posted on June 22, 2015 at 14:18:19
KevinC
Manufacturer

Posts: 2984
Location: NC
Joined: April 19, 2001
 The closest candidate in a small output is the LL1682/XXmA, which would be 8.8K:8ohms with a 50% tap.

Kevin Carter
K&K Audio
www.kandkaudio.com

 

RE: ultra-linear, posted on June 22, 2015 at 14:47:38
thermionic addictions
Audiophile

Posts: 894
Joined: June 16, 2006
 Thanks

That should work just fine. Now, how would I configure the connections
to get these results. The pdf doesn't say.

Cal

 

RE: ultra-linear, posted on June 22, 2015 at 17:11:19
KevinC
Manufacturer

Posts: 2984
Location: NC
Joined: April 19, 2001
 In the data sheet diagram of the SE connection, use either of the jumper connections between pins 5 and 11 as the UL tap.

Kevin Carter
K&K Audio
www.kandkaudio.com

 

RE: ultra-linear, posted on June 23, 2015 at 11:05:47
thermionic addictions
Audiophile

Posts: 894
Joined: June 16, 2006
 Thanks Kevin
That should work fine, just out of curiosity what UL percentage would I get
if I used either the 3 pin or the 9 pin as the UL tap.

Cal

 

RE: ultra-linear, posted on June 23, 2015 at 12:35:56
KevinC
Manufacturer

Posts: 2984
Location: NC
Joined: April 19, 2001
 about 17%

Kevin Carter
K&K Audio
www.kandkaudio.com

 

RE: ultra-linear, posted on June 23, 2015 at 14:27:53
thermionic addictions
Audiophile

Posts: 894
Joined: June 16, 2006
 Hi

Wouldn't one tap have a higher ratio than the other?
Doing the math using the turns ratio I get around 17% on one pin
and around 83% on the other. Possibly I am way off here?

Cal

 

RE: ultra-linear, posted on June 23, 2015 at 16:07:00
KevinC
Manufacturer

Posts: 2984
Location: NC
Joined: April 19, 2001
 You are correct. I was only quoting the nearest tap to B+.

Kevin Carter
K&K Audio
www.kandkaudio.com

 

thanks nt, posted on June 23, 2015 at 17:12:36
thermionic addictions
Audiophile

Posts: 894
Joined: June 16, 2006
 nt

 

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