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Old 19th April 2006, 11:08 PM   #1
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Default Quick Output Transformer Question

I am going to use a pair of the Edcor transformers for a headphone amp. My headphones are 32 ohm, and I'll probably put a 32 ohm resistor in parallel. Do I need to do anything different to use the amp as a preamp? That is, will seeing a 10K, or a 50K input impedence cause reflection problems? Will I need to use a different resistor on the secondaries, or would transformers with a 600 ohm tap be a better idea? Thoughts?
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Old 19th April 2006, 11:21 PM   #2
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These would work with a tube that could handle a 2K load:

http://www.edcorusa.com/classx/match...XSM10k-150.htm

I'm no guru, but the fact that they are interleaved whereas the $17 ones are not would work to your benefit.
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Old 20th April 2006, 01:05 AM   #3
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They are certainly cheap enough to try them both, so I may do that. If the tube wants a higher impedence, could I simply add a resistor in series with the headphones?

And, to the original question ... is the 16 ohm output okay as a line stage or will there be frequency problems?
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Old 20th April 2006, 02:31 AM   #4
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You want the tubes to see a constant load for best fidelity.

Using an Edcor with an 8 ohm secondary, then paralleling a pair of 18 ohm resistors (9 ohms) will provide an excellent load match with 32 ohm phones.

I did some experiments with this on my 6FD7 amp, which has a switched headphone output and XSE15-8-5K's and it seems optimum.
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Old 20th April 2006, 04:36 AM   #5
ttan98 is offline ttan98  Australia
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Hello fellows,

Do you know which company(ies) makes VERY high QUALITY transformers, single ended and Push pull, in the states and international?

Edcor?, Hammond? Sowter? etc
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Old 20th April 2006, 07:08 AM   #6
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If you mean DC to daylight with zero phase shift ( ), I hear Lundahl is a good place to start
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