jberenyi wrote:

JRC NRD-515 – like new
• Gilfer filter mod with 8.0, 6.0, 3.5, 2.4
• Bournes 10-Turn Pot mod by Gilfer
• Sherwood modified for SE-3 compatibility
• NDH-518 96 channel memory unit
• NVA-515 Matching speaker and original box
• Full documentation including service manual
• NCM-515 key pad controller

Put one of them in a closet and use the other one.Every few months, swap
them around.
cuhulin