K&K Audio / Lundahl Transformers

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K&K Audio / Lundahl Transformers

Re: Interstage Transformer Nomenclature

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In Reply to: Re: Interstage Transformer Nomenclature posted by KevinC on January 15, 2005 at 13:35:30:

Thanks Kevin for the jump start reply. If a 1:1 IT is called for, then what are the actual impedances specifications needed? Would they be 5k, 2.5k, or somethink else? If this depends on the driver tube and output tube, what are the rules in determining the impedances?
Regards,
David

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Re: Interstage Transformer Nomenclature - KevinC 16:14:44 01/15/05 (0)
Often the "nominal" impedance spec is given for the transformer to indicate its intended application. Interstage transformers are typically designed to be used with source impedances in the range of 10K-50Kohms. Lower impedance tubes can be used, but will usually result in resonances above 30KHz, although I have never found these to affect the sound substantially. Lundahl interstage transformers have an upper plate impedance limit specified for the connection chosen to indicate whether a particular tube choice might be the best for the application. Take a look at the datasheet for an LL1660, for example. The upper limit for connection alternative S is specified as 15K ohms. A tube with a plate impedance of this value or less will meet the frequency response specifications if used appropriately.

Kevin Carter
K&K Audio
www.kandkaudio.com

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