bcowen
Headphoneus Supremus
Found a deal on a 12AU7 single. Hopefully 5814A is compatible.
https://www.ebay.com/itm/1-x-NOS-PH...14A-12AU7WA-ECC82-AMPLITREX-TUBE/323571470771
If he'd drop the price by $9.98 and offer free shipping, this would be an excellent tube to break the top off of and use for checking the gas circuit in your tester.