Another inexpensive and uncomplicated model is the B&K 747. Rarely needs adjustment and is accurate at determining and matching transconductance readings on most audio tubes.
Excellent advice so far. With the Hickock Cardmatic, if you can find one, you need not twiddle with dials, but use a specific card for a specific tube, as the name implies. If you live in Europe, the Hickock's brethren would be the German made "Funke", which however, you'll rarely find under $700. Cheers,
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