Tube 6x4 pdf

These earlier G tubes are still in the "coke bottle" envelopes. These are great tubes, they sound good and are well built. The new Sovtek is quite a bit more robust looking. Spec sheets for the 5U4 can be found here: here.

Here are two modern 5U4G tubes, a Sovtek and a Ruby. The workhorse 5U4, the straight bottled tube of the 's onward. Some of these are bad-ass tubes. Here are a Sylvania and an RCA. Typically, the Sylvanias tend to be taller with narrower plates, while the RCA manufacture were stouter with wide plates. The 5AR4. The 5AR4 is one of the most iconic rectifier tubes, with a legendary reputation for its soft start and NOS tube longevity often far beyond expectation.

These are a few of the Mullard examples, with the first being the metal base made in Holland tube. This is one of the most well-known tubes of any type. Next is the saw tooth 5AR4 labeled G. The older Mullards are hard to beat. My advice is to buy a new testing Mullard while they still exist affordably, and never need that tube again. It may last 10's of thousands of hours, which is a lot, and they sound best. This is an easy win. Spec sheets for the 5AR4 can be found here: here.

The metal collared Mullard 5AR4 are the most desirable and the most expensive of the tube type, but they reportedly last for many tens of thousands of hours, so in the long run it might be worth the expense. The "saw-tooth" Mullard is a classic tube and is a great place to be in 5AR4.

And of course separate heaters and heater windings, or heater-cathode construction beware H-K voltage limits. You sometimes find doublers on V US transformerless gear using a special big twin-diode. You rarely find doublers in amateur radio transmitters using odd-voltage surplud PTs and surplus rectifiers and rect heater transformers. Today a 1N is a much better idea. This rect and 1st or reservoir cap thing has always driven me nuts.

I knew nothing about this at all , didn't care. The amp still had the original 5Y3 in it. Nothing even happened and I used that champ a lot. Now that awhile back I went seaching things out and found all this info of what cap goes with what rect tube. I put a 47uf in my SF champ build and was told to just place a 47 ohm resister between the 5Y3 pin 8 and the first cap so I did , it was to slow the inrush. Some fenders with the 5y3 use a 30 uf and the bronco like a vibro champ uses a 40 uf.

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You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser. Thread starter Sorento Start date am. Sorento Member. Does this setup double the rectified current allowance from 70mA to mA? I expect some mA in my application.

More options. JonSnell Electronic Member. After last months huge transmitting triode, this months tube will be at the opposite end of the size spectrum, the 6X4. Labels: 6X4 , Tube of the month. Daniel October 25, at PM. Anonymous March 18, at AM.