Mercury AD-4 Vacuum Tube Tester Adapter. This will only work with Mercury Branded tube testers. Please check fitment before purchase.
Untested. No way to test. Manual available for download on the internet.
Appears to be in excellent condition. One scratch in upper right corner. Scratches on bottom. Wire loom also in good shape with all pins straight and intact. I do not see any bent pins in the tube sockets.
Free shipping included in Buy-It-Now via USPS Economy shipping. 3-10 days depending on location.
PayPal only, or Local pickup in the Portland, OR Metro area.