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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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In Reply to: Harmonic Equalizer posted by keto on June 9, 2004 at 06:00:31:
Try it with a 100-ohm pot first, listening to material with a dense spectrum (loud choral music) that will generate lots of IM sidebands. Adjust the pot a bit at a time and listen. The clearest, most natural, and most open setting is what you want - never mind crap like tone-shaping, that's your speakers job to get right. Then take the pot out and measure the setting, and there you are. The exact pot setting is a function of load impedance (somewhat variable with speaker loads) and high-order errors in the transfer curve of the active devices.
As mentioned earlier, there are several ways to build a Western Electric Harmonic Equalizer:1) Add the pot in series with a conventional cathode-bypass cap.
2) Add the pot in series with WE-style shunt cap between OPT center-tap and the cathodes of the power tubes - if the tubes are DHTs, going to the center-tap of the filament transformer.
3) Subtract 100 ohms from the cathode resistor, add the 100-ohm pot to the cathode end, and connect the bypass or shunt cap to the wiper of the pot.Just think, John Atwood, Allen Wright, and I have re-discovered a Western Electric technique as old as feedback, but forgotten since 1936 - and you can be one of the first to hear it again after 68 years!!! Go for it, guys!
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Follow Ups
- Yes! - Lynn Olson 17:35:53 06/09/04 (1)
- confirmed... - keto 12:19:47 06/11/04 (0)
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