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previous: Bryan James building a preamp based on the fend... -- 1/24/2000 9:21 PM

Re: Preamp output suggestion question

1/25/2000 7:14 PM
D.P.Coyle	Re: Preamp output suggestion question i. Is preamp overdrive REALLY what you want? (as opposed to output stage overdrive).... I don't think so. 2.An output xfmr will usefully break ground loops between chassis. but it needs to be driven by a low source impedance, like a cathode follower to not be interacting with the cables and next stage, regardless of single or balanced. Check antique audio, too. 3 Jensen has highest quality, Sescom less expensive output xfmrs for line level. To run balanced you need to construct a balanced driver, which is what an inverter does in a push pull stage. 4. For this use, the output xfmr wants to match the output impedance of the preamp, which is determined by the last stage.

1/25/2000 7:14 PM

D.P.Coyle

Re: Preamp output suggestion question

i. Is preamp overdrive REALLY what you want? (as opposed to output stage overdrive).... I don't think so.
2.An output xfmr will usefully break ground loops between chassis. but it needs to be driven by a low source impedance, like a cathode follower to not be interacting with the cables and next stage, regardless of single or balanced. Check antique audio, too.
3 Jensen has highest quality, Sescom less expensive output xfmrs for line level. To run balanced you need to construct a balanced driver, which is what an inverter does in a push pull stage.
4. For this use, the output xfmr wants to match the output impedance of the preamp, which is determined by the last stage.

Replies:

Bryan James i. Is preamp overdrive REALLY w... -- 1/25/2000 7:53 PM