Technical and speculative discussion of amps, cables and other topics.
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Are there any "issues" with the use of a transformer in place of an output coupling cap (to stop DC)?
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Posted on December 18, 2012 at 15:18:07 | ||
Posts: 12548
Location: Melbourne Joined: September 2, 2000 |
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 |