AMPLIFIER DESIGNS FOR REDUCED IMD
https://www.electra-print.com/reduced_imd_amp.php
Electra-Print Audio has been investigating the effects, causes and reduction of IMD in tube amplifiers. The following is a list of causes and cures and low and low-rise IMD circuitry, in a practical application format. IMD being the modulation of high frequencies by the lower frequencies with a resulting sum and difference of many odd combinations of audible products. The standard measured value of IMD for very good performance of an SE amplifier is less than 2% at 1 watt and about 4% at the amplifier's mid-power level. For very low power amps, such as the 45 tube, 2% at .5 watt is used. All of our tests are done with, two tone, 60Hz/6kHz, 4:1, SMPTE standard signal. These amplifier designs do not use global negative feedback, common in push-pull amplifiers. Those amplifiers that use negative feed back show results with very low IMD as well but also generate artificial bandwidth and its resulting signal compression. This is at the expense of output power with a dependency on Nyquist phase analysis so that the amplifier will not oscillate.
This post is made possible by the generous support of people like you and our sponsors:
Topic - "AMPLIFIER DESIGNS FOR REDUCED IMD" - rage 06:05:43 11/19/21 (30)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - tube wrangler 13:43:00 11/20/21 (0)
- 'common in PP amplifiers'? - PakProtector 18:52:16 11/19/21 (0)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - Triode_Kingdom 09:42:53 11/19/21 (20)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - rage 05:36:02 11/20/21 (19)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - Triode_Kingdom 15:39:55 11/20/21 (18)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - PakProtector 05:22:34 11/21/21 (17)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - Triode_Kingdom 14:18:12 11/21/21 (5)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - PakProtector 17:31:26 11/21/21 (4)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - Triode_Kingdom 17:55:09 11/21/21 (3)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - PakProtector 19:00:45 11/21/21 (2)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - Triode_Kingdom 07:16:41 11/22/21 (1)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - PakProtector 15:36:58 11/22/21 (0)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - cellailuca 08:22:20 11/21/21 (10)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - PakProtector 17:29:41 11/21/21 (8)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - cellailuca 00:25:12 11/22/21 (7)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - PakProtector 01:53:21 11/23/21 (6)
- That's the point! - cellailuca 04:23:45 11/23/21 (0)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - sony6060 02:53:43 11/23/21 (4)
- 1% THD is Detectable by Most People - Triode_Kingdom 10:32:08 11/25/21 (2)
- RE: 1% THD is Detectable by Most People - sony6060 11:59:24 11/25/21 (1)
- RE: 1% THD is Detectable by Most People - Tre' 20:26:45 11/25/21 (0)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - PakProtector 15:40:10 11/23/21 (0)
- Effects of IMD - Triode_Kingdom 14:07:06 11/21/21 (0)
- Above about 90 dB SPL... - cellailuca 07:36:26 11/19/21 (0)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - deathtube 667 06:43:01 11/19/21 (3)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - GEO 12:22:59 11/19/21 (2)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - deathtube 667 18:13:00 11/21/21 (1)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - Tre' 16:46:19 11/22/21 (0)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - Tre' 06:39:07 11/19/21 (1)
- RE: "AMPLIFIER DESIGNS FOR REDUCED IMD" - rage 09:13:47 11/19/21 (0)