Grace Design Model 101 Rare Microphone Preamp Excellent condition. This is not the M101 mass produce one this is the Model 101 on low production The advantage of this approach is that it should adapt well to microphones of varying impedance, but the caveat is that the design of any transimpedance amplifier has to be balanced very carefully to prevent it from becoming unstable as a result of input capacitance. The engineers at Grace have clearly got this problem nailed, as their design has a frequency response that would make many radio transmitters jealous! The exact bandwidth of any amplifier depends on how much gain is being applied, but at a typical mic gain of 40dB, the response extends from 12Hz-170kHz, and at lower gain settings can exceed 400kHz. Clearly nobody can hear anything remotely that high, but designing the amplifier this way gives it a very flat phase response within the audio band, and ensures that transients are not compromised.
When it comes to noise, that depends on the impedance of the connected source and ranges from -124dB for a 600 Ohms source to better than -130dB for a 50 Ohms source. With a typical mic impedance of 150 Ohms, the Equivalent Input Noise is -128dB. The distortion figures are also exceptionally good with the'distortion plus noise' figure coming out at better than 0.001 percent for 20dB of gain and better than 0.005 percent for 60dB of gain, measured with a +20dBu output. A maximum output level of +25dBu is available before clipping, so there's plenty of level to drive even the most insensitive converters comes with power cord.
The item "Grace Design- Model 101 Rare Single Channel Microphone Preamp" is in sale since Wednesday, October 21, 2020. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Preamps & Channel Strips". The seller is "doseshop" and is located in Panorama City, California.This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay, Russian federation.