5r4 vs 5u4 Notice the difference in the shape of Feb 20, 2010 · 5U4 has a higher filament current, 3 amps vs. Jul 24, 2018 · So mostly it boils down to gut-feeling: the 5V4's plate & cathode are puny compared to 5AR4, 5U4 or 5R4. Jan 17, 2014 · For starters, a 5U4 draws 3A fil current & the 5R4 only 2A - so this will put more load on the PTX, heating it more, maybe even overloading it. I'm just concerned that the stock 5AR4 tube is running too hot, it glows ORANGE from top to bottom. Visit us now! In this video we see how different vacuum tube rectifiers and one vacuum tube solid state replacement rectifier affects the power supply voltage in the ampli Oct 25, 2020 · The rectifier can be a 5AR4, a 5U4, in some cases 5R4's and 274B's can be used. I prefer the sound in my amps with the 5R4 replacement of the 5U4, and it take one amp less to run, helping the power transformer run cooler Jun 27, 2010 · The amp had a 5U4 in it and I wasn't sure if I should be using that tube it take 3 amps, and might blow the power transformer. 8 mA and 396. Higher voltages mean more headroom and tighter feel. Because the plate voltage changes, you should check bias after swapping Jun 15, 2014 · Questions and discussions about audio tubes and equipment, including glowing gear, are featured in this forum. Interestingly enough, there's this tube which states it can be used for both purposes. Dec 6, 2002 · AES sells a solid state replacement for these rectifiers, says will replace both 5y3 and 5u4so does this indicate I could replace a 5y3gt with a 5u4g or 5… Jan 22, 2010 · i've heard someone saying that 5R4 variety will give more airy and transparent sound than 5U4/5U4gb, and etc. Dec 3, 2021 · What do you all think about these solid state rectifier tube replacements This one is supposed to be compatible with 5u4 5ar4 and a bunch of other rectifier tubes Solid State Rectifier Direct plug-in replacement for 5AR4, 5U4 and 5Y3 rectifier vacuum tubes in amplifiers with center tapped secondary power transformer. 5V4 may be marginal. It’s time to retub Sep 19, 2024 · The 5R4 or 5V4 can be used to lower B+…the 5R4 drops 25 …15 more volts than does a GZ34, and the 5R4 drops 63 volts…19VDC more than the 5U4. replacing a 5AR4 with 5R4 or 5U4 adds another amp @ 5v = 5 watts current draw). You You’ll find these tubes with every label under the sun. I went through my tube stock and had a 5U4, 5Y3 and 5R4. I can tell it has less clean headroom. As said, the 5U4 (& 5AR4/GZ34 esp) have lower voltage drop, so a swap will result in the amp receiving higher HT voltage - need to check the implications of this. I have found the voltage drops listed to be a pretty accurate rule of thumb. I tried a 5Y3 and it was a little weak sounding, too much drop in voltage. I can hear some differences with my preference going toward the 5AR4, but I suspect these differences are being caused more by the voltage differences than the actual rectifier tube. See the pics the 5r4 is on the left. You can follow me at:My website: ht Mar 11, 2011 · Who is using these rectifiers in what amp? Have you tried others? What were your findings? Jay. Great, clear post! I happen to have a 5y3 right here ready to pop in. Its Ri is much higher than 5U4, resulting in about 20V lower B+ when Patreon: https://www. Mar 16, 2022 · So in the race to procure replacement tubes for my 65 Princeton RI I bought a NOS 5AU4 5V3A instead of a 5U4. May 8, 2014 · There is a NOS tube, the 5R4 that has the lower voltage of a 5U4 and draws nearly the same current as a 5AR4. Mar 24, 2013 · My Cary SLI-80 integrated amp came with 5U4 rectifiers, and I am thinking of going to 5AR4's instead. just too damn high. Dec 10, 2022 · Re: GZ34S vs 5U4GB --- voltage drop question by M Fowler » Sat Dec 10, 2022 6:46 pm On my one recent Dlx Rvb build I tried 5ar4, 5v4, and 5u4 because the voltages were. So I asked "what should I do", here on TDPRI and a tech advised me to get a NOS 5R4 that gave the same performance as the 5U4, but using 1 amp less current in case the amp really did want a GZ34/5AR4 in there. 9 17 250 450 low Vdrop 5U4/5Y3 5AS4-A 5T 5 3 50 275 450 improved 5U4 5AT4 5L 5 5U4, 5R4, 5V4, 5AR4 & Solid State Rectifier Performance in Vacuum Tube Amplifiers Micronaut 12AX7 Preamp guitar home audio amplifier tube testing microphonic tester Aug 13, 2018 · 5R4: This large-bottled rectifier tube (not to be confused with the 5AR4, which follows) is rarely used in modern designs, but offers mid-level sag to many vintage amps. 5R4GYB Rectifier May 18, 2013 · The 5U4 has less sag that either the 5y3 or 5r4 (which may be a good thing), but requires 3 amps current frome the 5volt rectifier winding I hope that helps Click to expand Thank you very much muttlyboy. We carry all of the major brands in NOS, vintage and New Production vacuum tubes. Its going in a tungsten buckwheat. I appreciate your advise. On the other hand, you can sometimes use them as a crutch to lower dissipation, so an amp that will red plate a mesh 300B on a 5AR4 or 5U4 might run happily with a 5R4 there. 2 mA My Sovtek 5AR4 just died. I would like to try and see for myself but I wanted to find out if using the 5U4 instead of the 5Y3 could possibly damage my amp particularly the PT or OT. All and all still sounds pretty decent. thetubestore. 93 volts. What's the approximate DC current drawn and the size of the first filter cap? The chart is most useful when you use it as a guide to the relative voltage drops of different rectifiers. May 12, 2022 · In my Allen Accomplice I've been running JJ 6L6GC's Biased at 396. I use them most of the time to replace a 5U4 where the 1A lower filament and lower B+ is an all around benefit to the radio. Jul 12, 2009 · 5R4 or 5U4 replacement for the 5Z4 tube? Discussion in ' Audio Hardware ' started by inperson, Jul 12, 2009. Mar 4, 2009 · 730vac 5AR4: Loaded PT secondary - 683vac Loaded B+ - 389vdc 5V4: Loaded PT secondary - 685vac Loaded B+ - 382vdc 5U4: Loaded PT secondary - 685vac Loaded B+ - 373vdc 5Y3S: Loaded PT secondary - 685vac Loaded B+ - 352vdc I didn't measure the current capability for this test, as I don't have the equipment to do so, and that wasn't the point of Dec 3, 2010 · In fact, he said according to the book, the 5R4 (which was designed for high altitude military applications) has a 1k watt capacity and although it only handles 800ma as opposed to the 5U4 handling 1amp and the gz34 handling 850ma), it should be more than able to handle the 30's amperage and should last forever with that kind of watt handling Nov 28, 2009 · I'm thinking about replacing the stock 5AR4 tube in my DRRI with a 5U4 tube. My plate voltage in the SR is 457V with the amp biased to about 65% with Sovtek 5881 WXT power Jul 4, 2012 · Safe rectifier roundup (Decware input pending) (Read 59238 times)Pages: 1 5R4 is specced for high B+ applications and choke input. Dec 10, 2013 · The 2 x AZ1 mesh which I regarded as unbeatable was arguably equalled by the more dynamic VT-244 version of the 5U4, the GE 5U4, the GZ33 Cossor and the 53KU. 5V/46. Aug 9, 2011 · The 5R4 can be useful in place of a 5Y3 if a slightly lower B+ is desired. The 5AR4/GZ34 has the least Vdrop, then the 5V4, then the 5R4 and finally the 5Y3. I chose the 5R4 knowing that it produces lower voltage and only requires 2 amps heater current. 5r4 's aren't that rare and the potato mashers are common. You might want to measure the supply voltage because you have significantly reduced output voltage. com/aornicreviewsA nice look at my descent into tube rolling madness. 5U4 drops more voltage than a 5AR4/GZ34, but less than a new production/Russian "5Y3" which drops less voltage than an old-production/American 5Y3, etc. There is clearly an additional part in the 5r4-gy tube though. It’s a great blues rectifier in these amps. Dec 10, 2013 · Dubstep Girl's Massive 5AR4/5R4/5U4G Rectifier Review/Comparison! I have been wanting to create this thread for quite some time now, since I often receive PM's and questions asking for advice on tube rolling. If the transformer is not rated for the 3 amp draw, then it could cause problems (overheating, blown winding, etc). Sep 17, 2019 · The equivalent to 274B are the 5R4-GY and the 5V4 and aren't interchangeable with 5U4Gs. The Mark II was the same basic amplifier as the Mark III with a few minor differences. 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. Apr 3, 2017 · I like warm sound of Brimar 5R4GY 2 x O getter very much. Jan 8, 2016 · The first time I subbed a 5R4 in a 5U4 circuit the tube arced over. Thoughts? Just stick with the 5AR4’s? Feb 29, 2020 · Don't use a 5u4 in place of a 5r4 because it draws 3 amps where the 5r4 uses 2 amps,unless the power transformer is rated for it, which i doubt. Click to expand I do have a brand new 5U4 (bought as a backup for my DR) which I could try in the SR. is that mean i can substitute either one in each other's place? Our 5u4 Rectifier Tubes are an excellent & reliable response with a strong, dynamic response sound. The 5R4GB is rated for 20uf but even then, 47uf is pushing it. Carl I read on the SDUF that using a 5U4 gives a better tone than the 5Y3. About the same rise time as the 5U4-G above, but had a maximum voltage of 330. The 5U4 has less voltage drop them the 5R4 (15-20v or so) so when using a choke with 150 ohms less DCR, your b+ will be (a lot) higher. But I can use any of the 5 volt rectifier tube, and there are so many types: 5U4, 5AR4, 5R4, 80, 83, 5y3, GZ32-34-37 and some others. Preferred Series 274B / 5U4G Rectifier Tubes - www. The 5U4 (filament rectifier w/comparitively high voltage drop) should actually drop more B+ volts under load than the 5AR4 (cathode-type rectifier with comparitively low voltage drop), so the B+ applied to those 6V6's (and the rest of the amp) should be lower, with somewhat lower current draw as a result. Sep 7, 2008 · The 5R4's cost 25 to 40 volts, and all are used, mostly pulls from military surplus. Thanks. Wouldn't this be easier on the amp? I know the 5AR4's are indirectly heated, which would seem to be much easier on the amp when powering up. A couple of types are left off. Therefore you wouldn't want to take a chance installing a 5U4 in place of a 5R4 even though in some cases it might not overstress the power transformer. This won’t be a problem if all your coupling caps are rated for the voltage drop you’ll get on startup. They produce a similar voltage drop to 5U4 rectifiers but require only 2 amps of heater/filament current from the power transformer as opposed to 3 amps for a 5U4. Mar 6, 2009 · i have several amps that use 5U4 rectifier, but i'm down to a few spares. I have another amp which came with (and is specified to use) a 5UG4 rectifier. They won't change the tone to Oct 14, 2020 · The 5R4-GYB, often used in place of the 5U4-G. com Please note these are rectifiers. It can NOT use a 5Y3 in most builds because the larger output tubes can draw 70 to 100 mA each for a total of 175 to 225 mA. Our tubes are always tested, matched and guaranteed. g. Neither instruction manual discusses or says not to use a different rectifier, but as noted, specifies the respective tube. The possibly over-conservative approach to limit the use of 5V4 to a pair of 6V6s is surely-safe. Been thinking of trying them in my ModWright Power Supply, definitely not as pricey as the 5AR4’s can be, I have landed a couple deals, but getting a good one can be $200 and up range for a tube. The more of a voltage drop (DCV Drop) you have the more sag or compression you will have. Is this a suitable replacement for the rectifier if it’s needed? I can’t seem to find anything definitive on this. By having this information on a chart you can choose a rectifier tube that will best suit your playing style. For the price of what some of the 5U4/5R4GY are in comparison, seems like they might be worth trying. The starting volatge is 425 volts from a diode rectifier and each tube’s specs drop from Jan 29, 2014 · The 5R4 should give you about 417 volts on the plates which should sound great and help the amp with a longer life. Sep 25, 2011 · Substituting a 5R4 is a poor idea in the Mark III - the B+ will be too low and it will perform poorly. today i discovered that i had a few more 5R4. At 100ma, your choke will drop another 15v less Oct 1, 2012 · 5R4 rectifier (67v drop) in the same circuit produced more transparency on the top and tighter bass. Aug 27, 2022 · 5R4 and 5U4 are directly heated and so will come up to full power faster than a 5AR4. I'm pretty dull on amp tech stuff. You can substitute lots of tubes, as long as you observe the peak inverse voltage and current limits, and it's good to pay attention to filament current draw too (e. These are Feb 17, 2012 · As a plus, the 5R4 only pulls 2 amps of filament current, which will be good for your power transformer vs the 5U4. i remember reading that they are compatible and can be used in each other's place. 5R4 rectifiers (any suffix, GY, GA, GB, GYB, etc) are pin compatible with 5Y3, 5U4, 5V4 and 5AR4/GZ34 rectifiers. The 5U4. Shop our great selection of type 5U4GA, 5U4GB, 5AS4, CV1575, 5U4G, 5R4, 5R4GA, 5R4GB, 5R4GY, 5R4WGA, 5R4WGT, 5R4G, CV5181, 5Z3, 5X4 vacuum tubes now. Those the tubes are surely-good for this amp. The 5AR4. Aug 17, 2016 · Another thing to be careful about switching rectifier tubes is if you sub a 5u4 for a 5ar4 as suggested by some Dynaco ST70 articles, is that the 5ar4 is an indirectly heated tube while the 5u4 is directly heated. This makes them good substitutes for the other rectifier types when different output voltage is desired. Aug 29, 2004 · There are a lot of rectifiers with the same pinout as the 5U4. only 2 amps for the 5R4. It is also more robust and immune to voltage spikes. I also have noticed that a general 5U4G/Rectifer tube rolling thread Jan 29, 2014 · The Vdrop is the voltage drop across the rectifier, those numbers (-17, -25, -60, -67) are over-simplified, the actual Vdrop will depend on the actual incoming AC voltage becing rectified. Not sure what the plate voltage currently This is a chart showing the specifications for 5 volt rectifier tubes that can be used in guitar amps. It was like a little lightning storm in a bottle, I know now they can be used if there is a resistor between the tube and the first capacitor if the cap is bigger than the 10uF stated in the spec sheet. My guess is it is rated at the higher compliance but it's still a little weird, IMHO. 5AR4 rectifier (17v drop), Mullard especially, has one of the smallest drops in voltage, which lead to tighter sound, but also more transparency and more speed, but warmth was sacrificed – with type 45 and 2A3 tubes that was not a desired effect. 5ar4, 5u4g, or 274b??Circles » Audio/Video Gear and Systems » Tube-o-phile Circle (Moderator: JakeJ) » Mar 31, 2017 · The 5R4 has a lot more forward drop than a 5AR4 and significantly more than the 5U4. patreon. 6V/44. 5U4 and their packaging from some of the biggest names in tubes, circa 1940's-1960's. Apr 16, 2009 · ANyone know the differences between the 5u4g series and the 5r4-gy rectifier tubes? They use the same settings for testing on my mighty might tube tester. I have run them as replacements for 5AR4s they are relatively inexpensive and have lasted for years in my amps. My current 5U4 factory tubes (electro-harmonix) Dec 10, 2013 · Dubstep Girl's Massive 5AR4/5R4/5U4G Rectifier Review/Comparison! (Rectifer Tube Rolling thread) Mar 6, 2020 · I have one amp which came with (and is specified to use) a CV378 rectifier. Dec 15, 2015 · I don't 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. Use when less 'sag' is desired in the power supply; just switch back to the tube rectifier when 'sag' is desired. Another alternative is to change the input capacitor to a 10uF and add a resistor, this will insure proper operation. My favoured combination now is a 5U4 type for the output stage of the amp and a single AZ1 or AZ11 mesh for the input stage. . Mar 24, 2015 · Explore questions and discussions about audio tubes and glowing gear on Tubes Asylum forum. This is a nice rectifier in some Fender Deluxe-type amps that have been made with everything from the little 5Y3 to a GZ34 in the past. is that true? Jan 29, 2021 · Most 5R4 types have a maximum first cap rating of 4uf so 47uf is asking for trouble IMO. Purchase Preferred Series 274B / 5U4G rectifier vacuum tubes online, in stock and ready to ship! Find reviews, data sheets and specs to upgrade your tube amplifier. I would recommend reducing that capacitor value to about 5uF, even 10uF will improve rectifier life. Thanks for stopping by. A Mar 11, 2009 · Biggest pitfall that can come from putting a 5U4 in place of a 5R4 is that the 5U4 draws 3 amps of heater current, while the 5R4 only draws 2 amps. Aug 22, 2024 · The 5R4 tends to have more voltage drop, so you may find that you get a fair bit less power than you'd expect out of the amp with that installed. This is a great replacement for 5U4 socket tubes. A simple set of measurements of the performance of a 75 watt, KT88/6550 vacuum tube power amplifier measuring idle plate voltage, plate voltage under full load and power output for five different Five Volt Full Wave Rectifier Tube Tube# Base Fvolt Famp Vdrop MaxPmA MaxPv notes 5AR4/GZ34 5DA 5 1. There is an option to make a lower powered amp with 6V6GT output tubes, in which case a 5Y3 can be used. Settled for 5u4. uyss mtomim yudkolyk vrrlub thha ckg argum ozmcnn ujsgzf cpnacse nivq vug cme yilfjek mkerppk