K&K Audio / Lundahl Transformers

RE: Line output transformer for 76 linestage ...

24.182.67.83

In Reply to: RE: Line output transformer for 76 linestage ... posted by MichaelM on December 28, 2008 at 05:36:20

Mike,

An asylum member who goes by the moniker 'keto' has built a preamp using the 76 tube (great tube btw) and did indeed use a 15K:500 transformer with success. Running the 76 at 5mA should be fine. Try 160V on the plate and about 7V on the cathode (using a 1.5K cathode resistor). Depending on who you talk to, some may say that using the 76 and other high rp tubes with transformer coupling may be a slight compromise as it doesn't comply with that whole 3:1 ratio. But who came up with that ratio? I think a lot of this is one person's experience versus the next.

Designing a transformer with a 20K or higher primary and adequate high frequency performance is much more challenging which is why you don't see a lot of them.

Anand.

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