Why fight the daily repair? Use and HP-312 or 312A? Also built like battleship. Only tubes in one ARE the Nixie Tubes! Bob - N0DGN On 4/24/2010 10:54 AM, Masters Andy wrote: > The venerable HP-5245L should not be overlooked. With its tunnel diodes, you could spend perhaps months of daily repair...built like a sunken battleship! > > Andy NU5O/P29AM/7Q7AM