G.R.A.S. 1/4" Preamplifier Type 26AS

Name: G.R.A.S. 1/4" Preamplifier Type 26AS
Brand: G.R.A.S.

Dynamic Range GRAS 26AS can handle both single and dual-sided power supplies. The supply can vary between 28 VDC and 120 VDC single-sided or ±14 VDC and ±60 VDC dual-sided. When using the high supply voltage (120 VDCor ±60 VDC), the dynamic range exceeds140 dB. Noise The electrical circuit in GRAS 26AS is built on a ceramic substrate using selected low-noise components to gain very low self-noise. The electrical self-noise is so low that system noise is mainly determined by the microphone capsule’s thermal noise. Frequency response The low-frequency cut-off of the GRAS 26AS preamplifier is mainly determined by the input impedance of the preamplifier and the capacitance of the microphone capsule. The capacities 20 pF,6.4 pF and 3 pF equal the typical capacitances of 1/2", 1/4" and 1/8" microphone cartridges respectively. The high-frequency cut-off is determined by the preamplifier’s ability to drive capacitive loads (slewrate), caused by the cable. For large-signals, the effects of these parameters must be accounted for when measurements are performed. The large-signal response for Type 26AS for various capacitive loads corresponding to different cable lengths is shown in the data sheet. The output level is in decibels relative to 1 Volt. Typical capacitance for the cable is 100 pF/m(30pF/foot). Connector The GRAS 26AS is provided with a 3 m light weight cable terminating in a 7-pin LEMO series 1B plug. The cable is only 2.5 mmin diameter and will withstand temperatures from–40 oC to +150 oC. An adaptor GR0010 for GRAS 1/2" microphones is included. The 26AS is also available as 26AS-CL with customized cable lengths up to 10 meters. Then specify the wanted cable length in cm.

Requires permit: Acoustics Lab's Staff:

Access to all common equipment and spaces in the Acoustic Lab

Keywords:

G.R.A.S. Microphones microphone preamp preamplifier gras Measurement Microphone Preamplifiers

Contextual Note for AI:

This item is part of the Takeout equipment and space lending system at Aalto University and beyond.

It is physically located in Aalto Acoustics Lab.

It is manufactured by G.R.A.S. 1/4" Preamplifier Type 26AS.

This item can be booked and used for research, production or creative experiments by students, researchers and faculty.

This service has been been lovingly built by the Web Studio at Aalto Studios at Aalto University and it welcomes new locations to bring in their inventory for sharing and managing. More information can be found by contacting webstudio@aalto.fi or from the user guide.