Frequently Asked Questions
RB-1590 - XLR Balanced input circuit improvement
RB-1590 - XLR Balanced input circuit improvement
The release below includes details of XLR Balanced input circuit modification to fix a white hissing noise on the XLR RIGHT channel.
| Release Type | |||||
| √ | Maintenance | Major | Critical | ||
| Serial Number (The serial numbers may be affected listed below.) | |
| Black | 228-337-1001 ~ 228-337-1030 |
| Sliver | 728-337-1001 ~ 728-337-1020 |
| Release Notes |
In a small number of units of the Rotel RB-1590 power amplifier, the JRC NE5532 OP AMP used exclusively in the XLR Balanced input circuit have been found to go faulty and may cause a white hissing noise on the RIGHT channel. The noise is exclusive to the XLR inputs and does not affect the RCA inputs. The OPAMPs are mounted in the XLR input stage. Locations are IC500 and IC501 as below:
If this issue occurs, we recommended replacing these with an alternate Texas Instruments OPAMP NE5532AP (Rotel Part Number: 031IC0008802 R/IC NE5532AP OP AMP DIP) to eliminate the issue. |
