Your tube get dirty and you think it overheated?

They may even look fine, but you don't get the output you want or need.

Full test of your GU74b tubes.

We can also test and match tubes for you.

HI Pot testing

RF Testing Amplifier

Full documented test report with the return of your tube or tubes.

GU74b Tube Testing

Qty

We sell NOS (New Old Stock) GU-74b or 4CX800 tubes. Pair of matched tubes available. click he..

$600.00

Matched pair of NOS (New Old Stock) GU-74b or 4CX800 tubes. Single tubes available - click ..

$1,250.00

$35.00