The jj gz34 5ar4 is a good and reliable rectifier tube suitable for use in both guitar amps e. Much like antiques, nos tubes are currently not being manufactured and this means their supply is dwindling while the price continues to rise. If you can contribute this data pleas email it to me. There are various sources for rectifier tube data sheets free on the net. Ive rolled a number of nos types over the last three years and am wondering two things. Welcome to tubedepot javascript must be enabled to.
Welcome to tubedepot javascript must be enabled to use this site. I have an air tight htm300 amp which has tube rectification. Made jan joint army navy tubes have passed the most stringent of tests uncle sam could require from a manufacturer. Rectifier tubes tagged 5ar4 gz34 5r4gy upscale audio. Rectifier interchangeability and its relation to clean headroom. Rectifier comparison and interchangeability chart kca. One of the best sounding 5u4g fullwave rectifier you can find other than the famed gec u52, and the western electric 274a and 274b. From table iii it is apparent that a 5u4g fullwave rectifier tube will easily and economically meet these requirements. Before the development of silicon semiconductor rectifiers, vacuum tube thermionic diodes and copper oxide or seleniumbased metal rectifier stacks were used. Im mainly interested in what tubes i can replace it with. Remove the rectifier tube and install the solid state tube replacement using a variable. The other thought i had is that it could be a 5u4g tube. The eml tubes feature a series connected filament for both diodes togetherm, which has certain advantages. The 80 rectifier tubes is intended for radios or small amplifiers.
Discussion in amp input normal or bright started by working man, may 7, 2014. A change from a 5ar4 to a different tube might result in more or less sag depending on the efficiency of the tube. The black print on the base has the chatham logo and reads jancahg5r4wga made in usa partial. Increasing the cathode bias resistor is often necessary. With the introduction of semiconductor electronics, vacuum tube rectifiers became obsolete, except for some enthusiasts of vacuum tube audio equipment. 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. What does nos mean, anyway commonly known as nos, the term new old stock simply refers to tubes that were made years ago but have never been used. You should consult the manufacturer of your equipment too if there are questions. The type 80 tube uses what is known as the ux4 base and as long as i select another fullwave rectifier with the same pinout and base requirement i shouldnt have any trouble. This military spec chatham 5r4wga rectifier tube has black plates, bottom getters, and a rugged ceramic base. Always check the bias and idle power of the tube with the new rectifier to be certain that it is running within spec.
This 5u4g tube is brand new nos in original uk military box, and was made at the thorn factory made in the 1950s we only have one piece in stock shown in the picture withd getter and brown base. Rectifier comparison and interchangeability chart kca nos. Rectifier tubes this page contains a list of rectifier tubes some of which may be obsolete. We do not know these differences as the 3bs2b tube data is not available. The 5ar4 and gz34 is an indirectly heated cathode tube which means it takes longer to warm up. Solid state rectifier for 5ar4, 5u4, 5y3 tubes antique. Plate supply voltages are measured with the rectifier tube nonconducting, i. Rectifier tubes having only one plate and one cathode, such as the 35w4, are called halfwave rectifiers. The new gibson les paul standard 60s is it worth buying. 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.
You should consult the manufacturer of your equipment too if. For power rectification from very low to very high current. I am working on posting the rca hb3 tube handbook on line on this site on its own page. The nos philips 5r4gys rectifier tube replaces gz345ar4 bargain priced. Tube 5u4g or rohre 5u4g id3352, fullwave vacuum rectifier, octal int. The sovtek 5u4g is a directly heated diode designed to rectify alternating voltage in generalpurpose radio equipment.
Nov 26, 2014 quick video showing a 5u4g rectifier arcing on startup. Full text of vacuum tube rectifiers internet archive. The tube has a straight sided t12 envelope and higher current ratings than the 5u4g. Russian tube 5c3s is a quality equivalent of the 5u4g. I dont know where i got this from, but given the discussions of late regarding over voltages, i thought this table of common rectifier specifications might be useful to the forum. The adjustment to the new operating point via a change in rectifier tube type is attributable to the differences in voltage drop between the two rectifiers. With a capacitorinput filter, a replacement cap of too large a value can be enough to cause excess plate current due to the oversized surge of. Sorry to create a bit of confusion in the first post about rectifier tubes stray capacitance doesnt have much if anything to do with creating voltage drop itself but this stray capacitance and how the rectifier tube deals with it incircuit is huge as far as affecting the overall sound of various rectifiers. We test our rectifier tubes on a tube tester that tests each half individually to insure that both sides are equally strong. When installing a different rectifier tube, especially from one that gives a greater drop to one that has a lower drop ex. If the set is designed to work the rectifier to the peak plate current as it seems that many sets are, it doesnt take much to nudge that current into the red zone and cause the tube to short. Solid state rectifier direct plugin replacement for 5ar4, 5u4 and 5y3 rectifier vacuum tubes in amplifiers with center tapped secondary power transformer. 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.
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. When you change the rectifier tube in an amp, it changes the voltages in an amp. Limited quantity available, new old stock, not for export. Sovtek 5u4g rectifier vacuum tube the sovtek brand of military grade vacuum tubes are made in russia and considered to be among the finest currently available.
If it is a russian tube, it isnt the same as a 5u4. Welcome to the tube data sheet locator, a popular web resource for finding data on vacuum tubes. This makes them good substitutes for the other rectifier types when different output voltage is desired. Does anyone have information on 5u4c rectifier tubes.
Tube 0z4 or rohre 0z4 id4085, fullwave coldcathoderectifier, octal int. Rectifier tubes are the diode component within a tube amplifier that converts ac voltage from the power transformer into a dc voltage to amplify sound. Jun 10, 2016 the type 80 tube uses what is known as the ux4 base and as long as i select another fullwave rectifier with the same pinout and base requirement i shouldnt have any trouble. I have found the voltage drops listed to be a pretty accurate rule of thumb. This is a list of vacuum tubes or thermionic valves, and lowpressure gasfilled tubes. The 5u4g is no longer the tube of choice for new mesa amps that feature a 5u4 type rectifier tube. From what i have been able to determine the nos mullard i am using first series fat base has different voltage characteristics than other vintage mullard tubes. This 1960s made tube developed for rugged video application has been found in quantity by upscale audio, in upland, ca. Jun 08, 2015 the new gibson les paul standard 60s is it worth buying. If you have never used this facility before, click the help link. Tube rectification is where sag comes from because a tube cannot keep up with the transient power needs for the amp whereas a ss unit can. This is the rectifier tube according to kevin deal of upscale audio. This slowrise, indirectlyheated rectifier should be considered an upgrade for a 5y3 tube in most circuits, and will drop slightly less voltage. Due to tall coke bottle design, this tube may not fit in all amplifiers.