I was told that improper tuning could be the cause. Hard to believe nobody has compared psvane 845hifi series tubes not 845t to shuguang 845b since psvane 845hifi have been on the market for a while. For many years, i tried to convince manufacturers of 811 and 572 tubes to use an additional grid wire to the empty pin, from the opposite support rod of the grid. All tubes have 60 days warranty, tested and matched by shuguang electron tube factory. Two tubes in class ab1 give a continuous output of up to 120w. New listing 2x matched pair shuguang 300b98 vacuum tube replace 300b 300bc 300bs 300bt new. This is a warning to stay away from shuguang 572b tubes as direct replacements for amps designed for 572b s. Not sure everyone is aware, but the shuguang tube factory is closed. The chinese sino 572b highmu power triode is manufactured by shuguang in china. I want to upgrade the 300b tubes on my wavac ec300b amp. Direct heating cathode, medium power consumption triode is used for class a amplification. Dx engineering 572b power tube dxe 572b dx engineering 572b power tubes are available for allpurpose amateur radio service. A normal tube, at least all the normal samples i have about 50 tubes of various types, self bias to about 40 volts. You can also choose from professional amplifier, home amplifier.
Shuguang vacuum tube factory tour report by steven r. Shuguang manufactures 40 percent of the worlds tubes. Gave them a careful inspection under high magnification for bentdistorted elements, and then checked them for shorts. They make more than 30 different types of power output tubes alone, plus of course many preamplifier, rectifier and others. Grant fidelity imports and sells generic shuguang tubes as well as their highend counterparts for amplifier use, the treasure series. The yaesu person i talked to on the phone told me modern 572b s will often cause oscillation in a fl2100z so i must be caucious selecting replacement tubes. Frankly, with the psvane 845t having been disappointing, there isnt a lot of incentive to bother with the more prosaic 845hifi when the b tube is so reliable, cheap and good.
China shuguang tube, china shuguang tube manufacturers and. It selfbiases off, with a completely open cathode return, at about 40 volts. At the moment i am still using the stock tubes which are a pair of standard shuguang 300b98. Electron tubes for industry the kt88shuguang has an absolute maximum anode dissipation rating of 50w and is designed for use in the output stage of an a. The top supplying country or region is china, which supply 100% of shuguang tube respectively. Popular in many brands of amateur radio linear amplifiers, these 572b tubes are a modernmanufacturing version of the vacuum tube that has been around for a long time. This is a warning to stay away from shuguang 572b tubes as direct replacements for amps designed for 572bs. There are 375 shuguang tube suppliers, mainly located in asia. Matched pair tested by factory shuguang 572b vacuum tube for. Matched pair 572b new valve tubes made by shuguang china.
June 2009 shuguang vacuum tube manufacturing facility article by rachel of grant fidelity shuguang was originally established on december 26, 1965. We are adding back in kt88z, 6ca7z el34, 300bz, cv181z exact replacement of 6sn7 and the most recently 6sl7z exact replacement of 6n9p models of shuguang treasure black bottle tubes with our newly formed quality control collaboration with shuguang tube factory. Throughout history, to speed development and reduce tooling costs, newer tubes use tooling from older tubes. Dx engineering introduces new 572b tubes for power amplifiers. I did read the manul and got input from where i got the amp. I did try out a shuguang trasure tube some time back. Room 369,xingyao,changsha city,hunan province,china,hunan province,china. Shuguang beijing vacuum tube datasheet analog metric limited free download as pdf file.
Does that mean my nos shuguang 811as from a few years ago will be worth. Also the curves for the rf parts 572b chinese tubes would be interesting to see as well. The kt88 is also suitable for use as a series tube in a stabilised power supply. Shuguang has produced eighty percent of 300b tubes ever made. This single change would be a major improvement in rf performance of the 572b and 811a vacuum tube. Great quality 572 b for use in class ab2, class b, class c rf, and audio amplifiers. Emission labs 300b vs shuguang black treasure audiogon. They have proven themselves in all kinds of amateur, commercial, and military service. Base indexed and internal structure aligned and supported for both horizontal and vertical operation. Rochlin, enjoy the is the leading authority in highend audiophile music and audio equipment. The psvane reference t series of tubes was created to offer an equally highend line that included common small signal tubesthe 12ax7, 12au7, and 12at7. Taylor is the preferred choice for fl2100, sb200sb201, 10160l, 30l1, etc. It made for an over all richer sounding tones and slightly lower noise floor.
Up for sale will be one matched pair 2pcs of shuguang treasure vacuum tubes cv181z substitution of cv181 cv181t 6sn7, packed in environmental protection box as picture shown, product of shuguang electron group. Shuguang vacuum tube manufacturing article by rachel of. Describe your experience with the 572b tubes china manu. Describe your experience with the 572b t160l shuguang and tell us why you give it the rating you did required. Amps replacing 811a with 572b the al811h runs about 16001800 volts hv, not 1400, which is why its not a bad idea to run the 572bs in that amp. The shuguang cv181 improves on the sylvania for all midrange and vocal qualities, improves in the 4 dimensions of prat, and gains extra tinglefactor. The original tubes sevtlana 572b made in russia new tubes from pentalabs made in china told should be just as good as originals or better.
The first 572b was made by united electronics for a company called waters. The 812 was a moderately low mu tube, primarily intended for grid driven modulator service. New listing vintage jan chy 5692 6sn7 cbs tube black plate brown basetube tested. Quite a few resellers will simply highgrade the shuguangs, put their label on them, and call them something else tad, ruby, groove tubes, so you think youre getting something different for the extra money but its really the same tube that just tests out better in a particular batch. If the free circulation of air around the tube is re stricted, a small fan. Well im back in the same place as before low output. Svetlana 572b has 170 of the amplification factor and they announce it is substitutable to t160z i made a mod and had its load capacitance increased by 10% to prevent it. Ameritrons exclusive dynamic alc gives you high level, low distortion rf processing it. Ameritron al572 linear amplifier 0 watts amp 4 x 572b tubes near legal limit. Up for sale will be one matched pair 2pcs of shuguang treasure vacuum tubes 300bz substitution of 300bc,300bs,300bt, packed in environmental protection box as picture shown, product of shuguang electron group. As of 2005 shuguang had developed 120 types of vacuum tubes, and manufactured over 70 million units. China grand tour 2009 shuguang vacuum tube factory report by steven r. Dx engineering 572b power tubes dxe572b free shipping. Now, dx engineering is a source for the popular 572b model power tube, which means operators can finally repair or upgrade their 572b linear amplifiers and put them back into service.
Taylor tubes is the preferred choice for fl2100, sb200sb201, 10160l, 30l1, etc. Get the best deals on 572b tubes when you shop the largest online. The new valve tube for those who skipped to the conclusion on the block is the shuguang treasure series cv181. This is a triode output tube which can be compared to a 300b when it is combined with an output transformer.
Dx engineering 572b power tube dxe572b dx engineering 572b power tubes are available for allpurpose amateur radio service. The tube to the left is in my high voltage test fixture. Yaesu technical bulletin for using 572b tubes in fl2100b. Due to datasheets that do not list the same conditions as western made 572b tubes, we are uncertain if the shuguang 572b has the same maximum ratings as usa made tubes.
Svetlana technical data 572b franks electron tube data. Its interesting to me that the old rca 811 as shown has a much higher pervience cathode than did the svetlana 572b. This is a triode output tube which can be compared to a 300b when it. If mistuned of if there is a load fault of some time that unloads the tank, or if the exciter ha. After ordering direct from hong kong from that jccsomething fella on ebay, they arrived at my home well packed and timely. This is a brand new, matched pair of shuguang 572b tubes. Shuguang beijing vacuum tube datasheet analog metric limited. Mar 21, 2018 audio lecture 28, how to insert 300b 811 572b 2a3 tubes into ux4 sockets duration. Electron tubes for industry the kt88 shuguang has an absolute maximum anode dissipation rating of 50w and is designed for use in the output stage of an a. Great quality 572b for use in class ab2, class b, class c rf, and audio amplifiers. It was the end of the 1980s that cetron ceased production of their 572b. Dx engineering 572b power tubes are the best choice for use in all types of rf power amplifiers and in all installation attitudes.
Stability problems and arcing problems are unrelated arcing or gassy 572b tubes. Dx engineering introduces new 572b tubes for power. Of the two plate curves i posted, neither one would pass the paofri test. It is dedicated to be used in audio frequency range which requires the output power 100w. Base indexed and internal structure aligned and supported for. Theshuguang treasure as a result of shuguangs 50year of expertise in vacuum valve design and production. Rochlin welcome to perhaps the largest vacuum tube factory in the world. In normal operation the anode voltage swings between twice high voltage supply to a few hundred volts positive. There is a seller on ebay that sells a bunch of shuguang tubes, and they have pairs of these el84s, has anyone had any experience with them. Shuguang treasure 300bz vacuum tube matched pair replace. This particular tube is unstable on higher hf bands even with a 47k filament ct leak resistance.
The svetlana 572b may be operated with its axis vertical and the base down, or horizontally with pins 1 and 4 in. Ameritrons exclusive instantaneous rf bias completely turns off the 572b tubes between words and dots and dashes. Will shuguang 572bs be substitutes for 572bt160l in fl. At the end of the article i mentioned that shuguang was working on a metalplate 845 tube, and that they expected to release it in september 2004. Ordered 4 shuguang 572b tubes from ebaychina to back up the tubes in my mfjameritron al572 amp, as i had a bad one in the amp from the factory another story. Click here to download pdf document click here to view data sheet. Other useful information would include your experience with similar products, infomation on a product that you would purchase instead of this one, and so on. These 572bs are a modern version of the venerable vacuum tube that has been around for a long, long time. These are the same as the gold class range in performance, but the glass or the top grid cap is slightly off centre during manufacturing.
A wide variety of shuguang tube options are available to you, such as 2 2. I own a heathkit sb200 and decided to try a matched pair. The 572b is an indirect descendent of the 811 tube. Dx engineering 572b power tubes dxe572b free shipping on. Preamp tubes are really a matter of personal taste, though. I have changed the ending of this overview regarding current delivery status. Find great deals on ebay for tubes 572b and 572b tube. The original tubes sevtlana 572bmade in russia new tubes from pentalabs made in china told should be just as good as originals or better. Highmu power triode for use in class ab2, class b, class c rf, and audio amplifiers. Shuguang 572b hiend vacuum tube valve best matched pair for amplifier new. The svetlana 572b also features a low loss ceramic base and a bonded ceramic plate cap thermal insulator for high power rf transmitting tube capability. Matched pair 572b valve tubes made by shuguang china.
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