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Please recommend me a TUBE DIY headamp to build. - Page 2

post #16 of 20
2/6/11 at 10:10pm
Thread Starter 

13EM7 seems to be a rare tube... but the design is very simple... wow

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post #17 of 20
2/7/11 at 5:45pm
Thread Starter 

i found this 1:20 speaker matching transformer with 16ohm output. feeding it 32ohms will yield around 600ohms in the primary. 

i shall try a 12au7 aikido first then try this transformer.

 

thanks for the input guys!

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post #18 of 20
2/7/11 at 9:46pm

A 1:20 transformer with 32r hanging on the secondary looks more like 12.8Kohms on the primary. 

 

Impedances are the SQUARE of the turns or voltage ratio.

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post #19 of 20
2/8/11 at 12:51am
Thread Starter 

i was talking about 1:20 impedance matching... sorry.

 

i shall post this soon after i check the tube inventory around here.

 

=)

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post #20 of 20
2/8/11 at 7:23am

I should note that I am confused with the transformer ratio. Where you and I have been writing 1:20 I think it should be 20:1. 

 

a 20:1 impedance ratio is a ~4.5:1 winding ratio. IME quite nice with a preamp with tasteful gain.

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