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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: Re: MP3 and M60 MkII impedence match...... posted by Luis on July 21, 2000 at 07:53:13:
>The only way to have a "pure" balanced connection
>is using a transformer.Sorry, but this is nonsense. A signal is balanced as long
as it has equal excursion in opposite directions either side
of AC ground, at the same impedance. Using an active
differential output (diff pair, diff opamp, pair of opamps,
whatever) is just fine.>Check out the whitepapers on
>http://www.jensen-transformers.comThere couldn't possibly be any bias here, now could there?
With regard to the original question, at RF (VHF+) it is very important
to have a sink impedance equal to the source impedance, otherwise
reflections occur and mess up the signal. At audio frequencies
the only thing that matters is to keep the sink impedance well
above the source impedance, to avoid frequency-dependent loading.
If you want to experiment with this, you don't need a xfmr, just
stick a pair of 300 ohm resistors in series across the input of
the M60 and ground the middle. If you think it sounds better,
fair enough.John
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Follow Ups
- Re: MP3 and M60 MkII impedence match...... - John Harper 08:27:59 07/21/00 (3)
- Re: MP3 and M60 MkII impedence match...... - Luis 10:34:05 07/21/00 (2)
- Re: MP3 and M60 MkII impedence match...... - John Harper 04:00:48 07/22/00 (1)
- Re: MP3 and M60 MkII impedence match...... - Luis 19:21:09 07/22/00 (0)
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