Sorry if this is the wrong place to post, but I'm looking to purchase someone's Amp-Head Dual Probe Bias Tester or something equivalent. I contacted Amp-Head and they said they don't have any in stock and don't have any plans to build and sell anymore either. I'm looking for something with the toggle switch to easily check back and forth from current to plate voltage. If you have one laying around you don't use or know of another brand that won't run me more than $100 bucks or even have a link with plans on how to build one, then please shoot it my way. Thanks.