Low-distortion Audio-range Oscillator - Page 173 - diyAudio
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Old 7th February 2013, 11:17 PM   #1721
richiem is offline richiem  United States
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Heh.
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Old 7th February 2013, 11:50 PM   #1722
davada is offline davada  Canada
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Heh.
What does this mean?
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Old 8th February 2013, 12:01 AM   #1723
davada is offline davada  Canada
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Originally Posted by benb View Post
Could this be why tube amps sound better, DC can't get through the output transformer? [/snark]
No. A small dc offset on a loud speaker has absolutely no effect on the sound.
It does however add additional heating of the coil. As the coil heats it loses efficiency and this can have an effect on the sound. A large dc offset will either drive the coil into the plate folding the former in or drive it out of the gap. Either way you have damage to your speaker.

I can agree that tube amps sound different from solid state but it is only a matter of opinion
that tube amps sound better.

Incidentally,we had just as many fried speaker come in for repair from tube amps as SS.
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Last edited by davada; 8th February 2013 at 12:07 AM.
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Old 8th February 2013, 12:01 AM   #1724
richiem is offline richiem  United States
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See last post on p172....
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Old 8th February 2013, 06:42 AM   #1725
RNMarsh is offline RNMarsh  United States
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Anyone listen to music? A pretty good jam can be found which really exercises a system... deep, deep lows, transients, highs and great playing. Go to HD Tracks and down load "Freight Train Jam' by WAR from the album 'The World is a Ghetto'.

Enjoy! -Richard

Last edited by RNMarsh; 8th February 2013 at 06:48 AM.
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Old 9th February 2013, 01:52 AM   #1726
RNMarsh is offline RNMarsh  United States
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Got any great music to recommend while I wait for parts to arrive to complete the Twin-T ??
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Old 9th February 2013, 06:00 AM   #1727
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Currently recording Schumann op. 39 (Eichendorff-Liederkreis). One of the best things I know.

Samuel
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Old 9th February 2013, 07:25 AM   #1728
RNMarsh is offline RNMarsh  United States
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Quote:
Originally Posted by Samuel Groner View Post
Currently recording Schumann op. 39 (Eichendorff-Liederkreis). One of the best things I know.

Samuel
What a nice thing to be doing. Will I be able to down load a flac 24/96+ when available? And, where will it be available and when?

Where is the recording being made?

Thx-Richard Marsh
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Old 9th February 2013, 04:57 PM   #1729
RNMarsh is offline RNMarsh  United States
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I was looking over the description of the oscillator manual of a K-H 4400A and it suddenly dawned on me that without the regenerative feedback, we could have a really flexible notch filter, cheap. The notch circuitry is built-in and selectable freq. Its the oscillator circuit itself without the regen feedback path. A disconnect switch for the regen path and an input port to the notch et al and I dont have to build anything. I spare 339A could be used for that. ?? Just an idea.

Thx-RNMrash

Last edited by RNMarsh; 9th February 2013 at 04:58 PM. Reason: Ready made notch filters --
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Old 9th February 2013, 05:29 PM   #1730
1audio is offline 1audio  United States
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The problems with the state variable filter used that way is the intrinsic distortion of the amplifiers and the tuning. That is the core of the analyzer in several analyzers, the Boonton and the Amber are two examples. The passive notch, like the B&K, are better. You could modify the B&K with active circuitry to make a tuneable high q notch with it. We just need to reverse engineer its circuitry, not a small task.
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