[HAM] Best 12AU7

[Scott Hawthorn]

At 02:22 AM 3/10/2008, Keith H Clark wrote:
>Scott,
>      Check ebay, that's where I got my Hickok 539C. Refurbed and calibrated
>it. Seems like prices have spiked in the last couple of years though...I'd
>send you mine but it gets too much use :>)

Good idea, thanks. So far, I have gotten around this simply by checking 
voltages around tubes. Would it be safe to sum up the advantages of using a 
tubes tester as
1. Checking output tubes for transconductance (?)
2. Checking input tubes for balance?