Very rare early NOS RCA 5Y3 GT 5Y3GT BLACK PLATE RECTANGULAR GETTER ! perfectly balanced and super STRONG.

Here for sale a super nice and very rare early and perfectly balanced NOS RCA 5Y3GT.

It's the nicest version, black rounded plate, rectangular  getter. Here you've got one of the very best of the very best 5y3gt ever made.

Tests results   119 %   118 %

Holy grail for tweed and blackface Fender amps.

Perfectly balanced and super strong.
Superb condition. Made in the USA
nice shiny getter flash. 
 One of the most robust efficient and long lasting 5y3 tube.

Probably no use use. Sold as new or very few use.

The perfect rectifier.

Get the very best from your vintage Fender or any boutique amp.

For perfect description please note, as shown on photos that the base in not 100% parallel to the glass it sometimes happens from factory. But of course no incidence at all on function or sound and the base hold firmly with no wobble.

Fully tested on Jackson 648S for

Filament

Circuit

Shorts

Plate

Life test...

The Jackson 648. It is definitely one of my favorite tube testers. While it does not employ a mutual conductance test circuit, it does use an advanced emission circuit that applies separate element voltages to each tube element, and separate load circuits are also used. “These voltages and loads have been carefully selected for each tube to meet most ideally the normal operating condition of the tube.” (Source: 1950 Jackson catalog.)

In my experience, the Jackson circuitry is very effective, and often will surprise you with accuracy that approaches Hickok’s coveted “mutual conductance” test method. ( Source tubesound web site.)

I do my best to test and describe the tubes the best I can.

Note that test results may vary from one tester to an other so this must be taken as an indication, although my Jackson is regularly tested for calibration.

 Photos are part of the description you get what you see.