Removed from equipment from the 1980s. Operation has been confirmed with a simple 2-circuit preamplifier (5.0v-18.0v). The items for sale are one operational amplifier and one gold-plated round socket. Thanks to your support, only a few are left. If you need two or more, please inquire via comments. I will accommodate with a separate listing. It will be shipped in a waterproof bag via non-standard mail.