This is a chart showing the specifications for 5 volt rectifier tubes that can be used in guitar amps. The rectifier tube upgrade made the most significant improvement. Its been a while but i was looking over a power supply design and i began to think about the rectifier voltage drop plot out of herbert reichs 1944 book theory and applications of electron tubes, 2nd ed. As with the other 274b tubes, it might not be compatible with all 5u4g amps, though woo audio amps are all fully compatible with this tube. Tube data suggests a maximum of 10uf as the first capacitor, your amp has 47uf. When i received it, it had a shuguang 274b in it, so for the fun of it i decided to try some different 5u4gbs in it. The more of a voltage drop dcv drop you have the more sag or compression you will have. Increasing the cathode bias resistor is often necessary. The currentvoltage characteristic of a single diode unit of the 274b tube is shown in figure 3. The maximum current capability for sophia electric 274b mesh plate tube is 90ma, suitable for tube preamp. Tube data suggests a maximum of 10uf as the first capacitor. Rectifier tube ta274bproduct information original products. Rectifier comparison and interchangeability chart kca nos.
This is what psvane audio boasts about their we274b replica tube. Rectifier comparison and interchangeability chart kca. Aug 03, 2017 we274b very impressive rectifier tube. Sophia electric tj meshplates and the 274b rectifier tube. We205d my friend cees owns a nice collection of we 205 vintage tubes. Sophia electric tj meshplates and the 274b rectifier tube a. The part number is the sku shown for the product, the item id is a 6digit numeric unique to each item. Its not really about whether solid state or tubes put out more dc voltage, its about how fast. Valve art 274b cryo treated rectifier cryoset online store. Rectifier tube ta274b takatsuki electric released the ta300b in 2010 after the absence of new domestically produced audio vacuum tubes for 35 years. Been running about 4 years completely troublefree so the 274b 66.
The 274b is a more traditional looking tube and has a plate structure very similar to the 5r4gy rca ww2 era double bottom getter tubes. Valve art 274b rectifier cryoset deep cryogenic treatment. 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. The tube amp doctor 5y3gt 6087 is a small bottle rectifier designed to perform closely to the original rectifier tubes used in many 1950s tweed amplifiers. A properly coupled transformer and tube rectifier should put out a specified dc voltage. When you change the rectifier tube in an amp, it changes the voltages in an amp. Oct 24, 2017 the 6x4 is an indirectly heated full wave rectifier tube for small currents. Cathode stripping is a highly technical issue, but the basics of it are this. Valve art 274b cryo treated rectifier cryoset online. A problem caused by directly heated or filamentary cathode rectifiers is known as cathode stripping. Rectifier tube tube tube for code 102d 102d 104d 104d 205f 212e 242c 215a 1020 205f 205f 205f 205f 1020 1040 242c. The maximum dc output current is specified as 77ma. Ive book marked the thread and will definitely refer back to it in the future.
Imo, the solid plate rectifiers are a more robust tube and last longer in most applications. The voltage is measured between the plate and a center tap on the filament transformer. Tube implosions are very rare caused by disentegrating and flying pieces of tube elements but that was one of the reasons mv rectifiers were frequently in cages. These tubes are a full wave rectifiers, electrically equivalent tothe originalwestern electric historical tubes. Most big transmitters always had a spare rectifier that could be switched in when one of the mv tubes arcedover. My question is, if the pre or amplifiers rectifier is properly designed to avoid voltage sags, will changing the tube rectifier to a different brand, not type, affect the sound. How much does tube brand really affect sound in terms of. This latest high performance design better controls both electrical and vibrational resonances that blur imaging for greater clarity to the source. The 274b is a filamentary, octal based, fullwave rectifier designed to supply direct current from an. The tad 5y3gt is a great tube for vintage style sag compression. This rectifier offers high reliability due to its rugged construction and the tube amp doctor premium selection process.
If the load is greater than the dc supply, this will cause a voltage sag which results in a compressed sound. Western electric rectifiers the holy grail whats best. If you would like to use this speed shop as your primary means of entering products, you may want to use our speed shop cart page. The 5ar4 and gz34 is an indirectly heated cathode tube which means it takes longer to warm up. 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. Pure power and the typical sag is the distinguishing. Our princess 274b rigid plate rectifier tube is a true replica of the vintage western electric 274b rectifier tube. Tubes free delivery possible on eligible purchases. Rectifier tube tube tube for code 102d 102d 104d 104d. If you have never used this facility before, click the help link on the left for detailed instructions. Tube 274b or rohre 274b id7451, fullwave vacuum rectifier, octal int.
All the chinese tubes with the 274b label are variations on the 5u4. The kr audio 274b hp rectifier tube is a perfect compliment to any tube amplifiers high voltage power supply. Directvoltage output characteristics as functions of the direct load current for a number of values of applied alternating voltage are given in figures 4 and 5. Apparently, this is a fairly fragile tube electrically. Swapping 5ar4 rectifier for 274b in a primaluna preamp. While they might make your amplifier sound fine, they are not really 274b tubes. Welcome to the tube data sheet locator, a popular web resource for finding data on vacuum tubes. What makes tube rectifiers magic to some peoples ears is that tube recitifiers do not react as quickly to large spikes in power demand as solid state rectifiers. If you check these chinese 274b tubes specifications against the actual 274b specifications in the western electric tube data book, you will find many differences. The 422a is a completely unique plate structure design and looks nothing like the 5u4gs where it is a substitute for. Solidly made and very low in microphonics make this a no brainer to properly power the finest tube amplification. Use this form to quickly add products to your cart by part number or item id. This makes them good substitutes for the other rectifier types when different output voltage is desired. The ta 274b rectifier tube is our second madeinjapan audio vacuum tube we developed by maximizing our technologies and knowhow accumulated in the creation of the 300b.
The 5ar4 and gz34 is an indirectly heated cathode tube which means it. Most of the weight of the unit is in the form of three large transformers of melody valves own design and manufacture. Diagram and data including transformer winding data for building a 75w ab2 amp using 6l6 or 807 page1, page 2, page 3, page 4, page 5, page 6, page7, download a zip file of all fgiles on the 75wab2 amplifier by clicking here. I find very little sound differences in rectifiers in my amps. Filamentary cathode rectifier tubes like 5r4, 5u4, 274b etc can deliver full dc levels only five seconds after powering up an amp in which they are installed. Enter the sophia 274b, st bottle, solid plate rectifier tube. To search for tube data, simple click the search link on the left. Hook it up to your desktop computer and a pair of great phones like the grado ps. Rarely is the difference caused by the tube, but secondary effects. The construction is a square plate though after checking the sophia web site they are now offering this in a meshplate also. The process makes a permanent change and the benefits do not deteriorate over time or upon return to operating temperature, it changes the whole way the vacuum tube performs. Many audiophile users have reported that it sounds better than the original vintage western electric 274b in the we91 300b circuit, or in a modern 300b singleended tube. It could be caused by any one of a dozen things, bad solder jointjoints, bad cap, bad resistor, dirty tube socket, even a transformer issue.
Shuguang beijing vacuum tube datasheet analog metric limited. Sophia electric princess 274b mesh plate this is a current production 274b rectifier offered by woo audio as an upgrade to the stock tube. Rectifier tube ta 274b takatsuki electric released the ta300b in 2010 after the absence of new domestically produced audio vacuum tubes for 35 years. The ta274b rectifier tube is our second madeinjapan audio vacuum tube we developed by maximizing our technologies and knowhow accumulated in the creation of the 300b. A tube that gives lower voltage may not be able to handle the current of.
Rectifier tube tube tube for code 102d 102d 104d 104d 205f 212e 242c 215a 1020 205f 205f 205f 205f 1020. Replacing the rectifier tube is a good way to get a different sound from your amp. If you can contribute this data pleas email it to me. I have a tube amp that can use a 274b or a 5u4gb rectifier tube. I have a new quad of sophia 274b rectifiers globe shape and princess. However, some things must be considered when changing rectifier tubes. 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. Dec 27, 2016 all the chinese tubes with the 274b label are variations on the 5u4. Rectifier tube for sale freemason antiques for sale. You could try swapping out the rectifier, it is on the list of possibilities, i hope you get lucky and that fixes it. While the audio world still holds western electric vacuum tubes as the holy grail but the availability is so remote and affordability are no where close to average persons wallet size, psvane audio out of china run by an elite group of designers left the state owned.
By having this information on a chart you can choose a rectifier tube that will best suit your playing style. When installing a different rectifier tube, especially from one that gives a greater drop to one that has a lower drop ex. Rectifier tubes this page contains a list of rectifier tubes some of which may be obsolete. Many audiophile users have reported that it sounds better than the original vintage western electric 274b in the we91 300b circuit, or in a modern 300b singleended tube amplifier circuit, and at a fraction of the cost. Buy 1 pc psvane 274b rectifier vacuum tube we274b duplicate 5u4g u52 brand new. New listing 1933 original western electric tube data book 205d 284. 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.
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. The 274b is a filamentary, octal based, fullwave rectifier designed to supply direct. If rectifiers make a big difference in sound, the reason is more likely a mediocre power supply design or marginal circuit. With its nearfreudian rectifier tube, and its tactile good looks, the wa6 is bound to be a conversation starter. The 6x4 is an indirectly heated full wave rectifier tube for small currents. I had originally thought that the straight lines were just approximations but then i wasnt so sure. Going from one type to another such as 5u4gb to gz34 will give you different tones and different sag characteristics. Buy 1pc psvane 5u4g rectifier vacuum tube for 274b 5z3p tubes preamplifier. Always check the bias and idle power of the tube with the new rectifier to be certain that it is running within spec.
The major benefit has been a dramatic improvement in dynamic range, micro detail with an increase in speed. Vacuum tube 274b, valve art antique electronic supply. Bridge rectifier datasheet, bridge rectifier pdf, bridge rectifier data sheet, datasheet, data sheet, pdf home all manufacturers by category part name, description or manufacturer contain. The attention to detail appears to be extraordinary.
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