5r4 rectifier tube data book

The mesa 5ar4 rectifier tube produces a vintage feel with light to mild sag. It is virtually identical, electrically, to the older fourpin type 80 tube, but with an octal base. According to one data sheet, pin 1 on a 5 pin 5r4 is noconnect. The 5u4g will in quite short order burn out the power transformer on your amp. Tube 5r4 or rohre 5r4 id7348, fullwave vacuum rectifier, octal int. I have some copies of some charts from gerald webers book on tube amps that compare different rectifier tubes. However, some things must be considered when changing rectifier tubes. That tube drops about 40 volts as opposed to the 5v4 and the gz34s and you will have reduc. This makes them good substitutes for the other rectifier types when different output voltage is desired. Apr 08, 20 trying to make heads and tales out of it, it says in the manual the 5ar4gz34 rectifier tube may be exchanged for other equivalent type rectifier tubes of the 5ar4gz34 family. You should consult the manufacturer of your equipment too if. Replacing the rectifier tube is a good way to get a different sound from your amp. It is also much easier to find and there are plenty for sale online.

Same for a filter choke of high resistance, a tired rectifier, or other faults. Nov 10, 2012 5r4 5r4gy tube rectifiers a mini shootout posted by lord soth a on november 10, 2012 at 06. Each anode goes positive in turn and current flows. Substitutes are given as a guide only please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. This military spec chatham 5r4wga rectifier tube has black plates, bottom getters, and a rugged ceramic base. Also, bad or tired filter capacitors, particularly the first one right after the rectifier tube, will result in low plate voltage. The maximum reservoir capacitor is specified at 4 f and the rectifier needs a series resistance of 250. Increasing the cathode bias resistor is often necessary. With two 5r4s in parallel you can get a fairly beefy high voltage rectifier at only 4 amps heater current. The wide glass tube envelope is 32mm in diameter, the base is wider, and the valve stands 72 mm high from base to the top of the envelope.

Tube 5r4 or rohre 5r4 id, fullwave vacuum rectifier, octal, io k8a, usa and powersupply shown. Welcome to the hoffman amplifiers forum may 07, 2020, 08. By having this information on a chart you can choose a rectifier tube that will best suit your playing style. Solid state rectifier for 5ar4, 5u4, 5y3 tubes antique.

There are no supply problems with 5u4g they are incred 36. The telefunken gz34tk is an excellent replacement for any amplifier using gz34 or 5ar4 rectifier tubes. Rectifier comparison and interchangeability chart kca. The rectifier tube upgrade made the most significant improvement. The black print on the base has the chatham logo and reads jancahg5r4wga made in usa partial. Premium directly heated heavy duty rectifier diode. However the manual states this tube the 5ar4 may be replaced with the 5y3 rectifier tube. Not sure if this is a function of the degree to which the rectifier tube can impact the sound or simply that the sonic difference between these rectifier tubes is less significant. The yellow label on the base has the sylvania logo. The 5ar4 and gz34 is an indirectly heated cathode tube which means it. With two 5r4 s in parallel you can get a fairly beefy high voltage rectifier at only 4 amps heater current. Even though it tests good on my heathkit tube tester i am very. Tube testing equipment why we dont sell certain brands filter by all 5ar4 gz34 5r4gy 5u4g 5u4gb 6ca4 ez81 gz32 gz33 gz37 nos tubes primaluna brand tubes. Sep 09, 2007 my anthem has originally had a 5ar4 but came with a jan 5y3gt in the power supply.

Swapping 5ar4 rectifier for 274b in a primaluna preamp. Reissue of the most popular rectifier valve ever built by mullard. It has found wide use in tube radios and early guitar amplifiers of the fender champ type. A tube that gives lower voltage may not be able to handle the current of. While it produces more sag than silicon diodes, it is the least saggy of our tube rectifier offerings. The 5r4gy is a high voltage power rectifier and was designed for transmitter use. Always check the bias and idle power of the tube with the new rectifier to be certain that it is running within spec. I usually tend to use 5u4gbs as the rectifier when needing a high current tube rectifier and account for the larger voltage drop with the correct transformer however the 5ar4gz34 is a good tube as well. Solid state rectifier direct plugin replacement for 5ar4, 5u4 and 5y3 rectifier vacuum tubes in amplifiers with center tapped secondary power transformer. The tube will burn out prematurely if the amp demands more than 125ma on a regular basis. The amp calls for the 5ar4gz34 tube but mine has the 5y3gt in its place. The 5u4 is great for higher current power supplies below 450, but i like the 5r4 more in some ways because it can handle really high voltages and only has a 2 amp heater current over the 3 amps required for the 5u4. This 1960s sylvania 5r4gyb rectifier tube has a tall bottle, smooth black plates, and a side o getter. There are various sources for rectifier tube data sheets free on the net.

The more of a voltage drop dcv drop you have the more sag or compression you will have. Rectifier tubes tagged 5ar4 gz34 5r4gy upscale audio. In the funke blue book, that is with the testers, it describes clearly in german. The 5ar4gz34 has the least vdrop, then the 5v4, then the 5r4 and. The starting point on the primaluna dialogue, my second tube preamp, was already pretty high so one has to work that much harder to squeeze out a performance improvement. In addition, when changing to a higher output rectifier in a self biasing aka cathode biased amp, eg, champ and others never assume that the power tube s isare safe. Apparently these tubes are interchangeable but i cant find anything to back this up.

Looking at the short specs, the 5r4 is a superspec of the 5z4, and therefore on the face of it would replace the 5z4 in the vast majority of rectifier apps. Helps extend the life of the other valves in the amplifier by allowing them to heat up before plate voltage is applied. The 5y3 is a mediumpower directly heated fullwave rectifier vacuum tube introduced by rca in 1935. This is a chart showing the specifications for 5 volt rectifier tubes that can be used in guitar amps. He says that any tube starting with a 5 should be able to be substituted for other tube starting with a 5. So summarizing, we are starting with the following conditions.

Some real live test data here of the 5y3 and the 5r4 9. The 5ar4 and gz34 is an indirectly heated cathode tube which means it takes longer to warm up. The vdrop is the voltage drop across the rectifier, those numbers 17, 25, 60, 67 are oversimplified, the actual vdrop will depend on the actual incoming ac voltage becing rectified. Hoffman amplifiers tube amp forum, rectifier tubespros and cons. They produce a similar voltage drop to 5u4 rectifiers but require only 2 amps of heaterfilament current from the power transformer as opposed to 3 amps for a 5u4.

Whereas 5z3 is electrically equivalent to 5u4g, many b4 tubes are very similar, but. Due to tall coke bottle design, this tube may not fit in all amplifiers. Rectifier comparison and interchangeability chart kca nos. Note that the 5r4 has higher voltage drop than the 5u4gb. Here in north america the main power is 120v at 60 hz so vm 120v and fm 60hz. So its hard to say exactly what size filter cap any given rectifier can support that book chapter will explain the process of figuring. The 5u4g is no longer the tube of choice for new mesa amps that feature a 5u4 type rectifier tube. William i meant to tell you also that when you use the 6l6g in the fisher 100 you need to use a 5r4 rectifier. Solid state rectifier for 5ar4, 5u4, 5y3 tubes amplified parts. Usa, not ukand rca recieving tube manuals for sale, as well as the rca transmitting tube manual tt4, and a book of data on western electric tubes.