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Tech Square Technical and speculative discussion of amps, cables and other topics. |
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Tech Square Technical and speculative discussion of amps, cables and other topics. |
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I am considering using coupling transformers, in place of coupling caps, on the output of a phono stage. But I have a few Qs: :-))
The spec sheet for the Lundahl LL1527 says it has a 0.4dB loss at the mid-band.
Q1: Does this imply the loss is different at different frequencies?
The spec sheet also specifies some particular input & output impedances for the loss & frequency extension figures it quotes - source 800ohms, load 4Kohms. This seems to me to not be compatible with the real-world situation which a phono stage finds itself in ... a phono stage feeds a line-stage preamp ... which is likely to have a Zin of 10-50Kohms?
Q2: Will this different load change the behaviour of the transformer? In particular, will it worsen its performance - in terms of loss & frequency extension?
Q3: The source impedance, also, is around 25ohms (not 800ohms) - so will this affect the performance of the transformer?
Thanks for any input,
Andy
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Topic - Are there any "issues" with the use of a transformer in place of an output coupling cap (to stop DC)? - andyr 15:18:07 12/18/12 (3)
- RE: Are there any "issues" with the use of a transformer in place of an output coupling cap (to stop DC)? - tesla 08:32:10 01/15/13 (2)
- RE: "issues" ...coupling cap (to stop DC)? - grhughes 05:05:01 02/17/13 (0)
- Yes, I did ... - andyr 11:06:31 01/15/13 (0)
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