Testing 572b tubes pdf

They have proven themselves in all kinds of amateur, commercial, and military service. I also know my hickok 752a i sold a few years ago has 811 test parameters. A low cost, easy to build diy valvetube tester valve heaven. Vacuum tubes radio tubes 5,000 different tubes in stock. 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.

Throughout history, to speed development and reduce tooling costs, newer tubes use tooling from older tubes. 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 list of vacuum tubes or thermionic valves, and lowpressure gasfilled tubes. For the displays i understand cost was the design mantra. The 812 was a moderately low mu tube, primarily intended for grid driven modulator service. A simple query if i may, have looked at the readings for the 3 tubes you. Ameritrons exclusive instantaneous rf bias completely turns off the 572b tubes between words and dots and dashes. These 572bs are a modern version of the venerable vacuum tube that has been around for a long, long time. I know some who sell tubes on ebay and other venues use such. How to test and align a linear amplifier qst may 1952, pp. The 6146 beam power tube and its various descendents 6146a, 6146b was and still is one of the most popular transmitting tubes in amateur radio service.

For other taylor tubes, see the entire 1945 taylor tube catalog in pdf format note, 1. Nos nib mullard el34 tube xf4 code gm tested very strong. This is the single best favor you can do your 32s1 s3 or kwm2 transmitter. If replacing tubes in an al572 amplifier, be sure to update the grid circuit and add voltage clamps on the filament leads. Dx engineering 572b power tubes dxe572b free shipping on. The opencircuited position is also used if the pin has no internal connection in the tube or the pin is intentionally excluded from a test such as in multisection tubes where each section is programmed and 20. The envelope, anode, and filament are identical to the 811 tube.

Describe your experience with the chinese 572b tubes and tell us why you give it the rating you did required. Out of those, about 60% of the tubes had excessively low anode voltage breakdown. In14 nixie tube excellent used 100% working in14 14. I had no intention of restoring the old rig, but the idea of designing another linear amplifier using that enormous chassis. Matched pair 2 rca 12bh7a gray plates tubes test nos. Eimac power grid tubes quick reference catalog 175 pdf. If you arent sure about which valve you need, or what tubes you can substitute, let us help you. Trending price is based on prices over last 90 days.

The 572b is an indirect descendent of the 811 tube. A normal tube, at least all the normal samples i have about 50 tubes of various types, self bias to about 40 volts. A western electric model tube tester manufactured by hickok has 300b settings. 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. Were i to face the same 24 tube limit today, i would bump the 5u4, 6aq8, 6bl7, 6x4, 12x4, and 7027 to make room for the above list of missing tubes. To maintain quality, rf parts and ameritron instituted full 100% testing, with any marginal tubes being shipped back to shuguang. All tubes i have tested have within a few percent same gain at normal drive power levels. Im not sure why this same model of tube tester was available in two different casestyles and colors, and if any reader can offer some kind of explanation, i will include it in.

How to build the dx811a allband linear amplifier cq. Typical operating conditions in amateur service are a va of 2,400 v and an output power from a pair of 400w. The hickok 752752a list the 811a as does my tv7c which indicates the transformer is adequate for those models. Test results will vary depending on the type and brand of tube checker. The 572b is a replacement valve for the 811 transmitting tube. Designed especially for tv and general electron tube testing. The al572 uses four rugged fully neutralized tubes. One way to tell a tube is bad is to put it in a tube tester. My conclusion is it makes no sense to install expensive 572b s if one not simultaneously increase anode voltage. The svetlana 572b may be operated with its axis vertical and the base down, or horizontally with pins 1 and 4 in. These eico tube testers calibrate almost too easily.

New tubes just like used ones will vary considerably in their mutual conductance measured in micromhos or gm for short. Radiotron model uv 200 vacuum tube rare experimental use only. I was told that improper tuning could be the cause. Obviously the very old antique tube types 4pin, 5pin, etc are not testable because there are no sockets for them, nor any test data in the setup charts.

We carry over 5,000 radio and vacuum tubes in stock every day and we ship world wide. Tubes for industry, music, ham radio, the audiophile. However, all 572b tubes are manufactured in one place and that is china, if you purchase these tubes from whomever and they have a warranty make sure you use your amp often, at least until you get 30 hours on them and if your output doesnt drop you probably have a good set. Maximum output power will be attainable, but the tube plates will literally deform and eventually fail with repeated use. You can build a test jig from junk parts for big rf tubes. I have completed one of the tubes and will do the other one this afternoon. The few tubes that seem to recover from prolonged filament operation quickly revert back to original behavior after being cold for a few hours. Base indexed and internal structure aligned and supported for both horizontal and vertical operation. Older tube testers will have provision for testing 456 pin tubes. Get the best deals on 572b tubes when you shop the largest online. Dx engineering 572b power tube dxe 572b dx engineering 572b power tubes are available for allpurpose amateur radio service.

My audio system uses tubes in all amplifiers, and the dac output, and my monos are otls which have 16 output tubes each,so being able to test and match tubes is paramount for me. More electron tubes can be found in the tube store collection of new old stock nos if you are looking for a tube shop carrying the very best tubes for your amplifier, youve come to the right place. The numbers are not entirely fair because swr to 572b s was worser than to original tubes. I will use 2 dc dc isolated converters and lcd displays from china 20ma.

They ramped up and build a few hundred amplfiers with 4 572b s, and filled the first 100 or so with svetlana tubes. Nde technologies for the examination of heat exchangers. Ameritrons exclusive parasitickiller effectively suppresses all parasitic oscillations. Oct 23, 2011 after one of my stock tubes shorted out cause unknown i ordered a matched set of taylor 572b s. Can most guitar amp tubes be tested the way you showed us with the 12ax7b. The tubes they are selling are made specifically for them, labeled as taylor tubes and they say the quality control is really tight on the tubes. Our commitment to providing the best products to meet our customers needs is second to none. Taylor is the preferred choice for fl2100, sb200sb201, 10160l, 30l1, etc. Inaccuracy in test results could occur if a discontinuity encountered differs in geometry from calibration discontinuities. Were i to face the same 24tube limit today, i would bump the 5u4, 6aq8, 6bl7, 6x4, 12x4, and 7027 to make room for the above list of missing tubes.

Taylor tubes is the preferred choice for fl2100, sb200sb201, 10160l, 30l1, etc. Tests here have shown very little difference, if any difference, between running 572b s for several hours before fullvoltage operation and the initial voltage breakdown. Eico tube testers i know of that has a vacuum tube under the panel. Actually, the tester was meant to be able to test tubes like the 6h30 and 6n1p and 12bh7 as it stood, but it would require looking in a table of values for the offsets required. If your tester will set up for an 811, it will also test a 572b. Also the curves for the rf parts 572b chinese tubes would be interesting to see as well. 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. My bias circuit uses a 10 watt zener diode having a value of 4. I installed them this morning and powered up the amp. Well im back in the same place as before low output. I would also like to test some recently aquired 572b tubes jim, there are a couple of things that come to mind. I suspect that these tubes are now being offered on ebay. The main category is vacuum tube resources that is about vacuum tube, electron tube, thermionic valve, valve resources.

Highmu power triode tube, for use in class ab2, class b, class c rf, and audio amplifiers. Pdf format or 8 data sheets from the rca tt5 transmitting tube manual. After each modification the amplifier was firmly tested and plates never becames red. Simplest way to add most 4 pin dht tubes to your design is to just suck it in and buy another transformer. It selfbiases off, with a completely open cathode return, at about 40 volts. Ameritron 572b replacement final tubes 3800572b free. Emission type checkers will only measure emission and this reading is very unreliable and will vary significantly with various tube tester models. As i mentioned earlier, you are even instructed how to adjust the calibration to fail tubes with an even higher leakage than the factory suggested setting. How to find out if an electronic tube is good with.

At the time, this list of tubes looked fairly exhaustive. Highmu power triode for use in class ab2, class b, class c rf, and audio amplifiers. Therefore, a sumiere test was done with the two types. Ameritron 572b replacement final tubes are available for the ameritron al572 series of 1,300 watt power amplifiers. Of the two plate curves i posted, neither one would pass the paofri test.

Yes, i have a tube tester that will do transmitting tubes. I dont think shuguang destroyed all of the returns, salvaging most for sell to domestic dealers. Richardson electronics is the premier supplier of electron vacuum devices in the world. 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. Ameritrons exclusive dynamic alc gives you high level, low distortion rf processing it. The tube was originally introduced by rca in an ad in the january, 1952 issue of qst magazine. If you think your odds of having a problem were high using two tubes, imagine using four at a time. A 6h6 rectifies one of the ac filament voltage for the neon bulb used in the shorts test. If the free circulation of air around the tube is re stricted, a small fan. Its interesting to me that the old rca 811 as shown has a much higher pervience cathode than did the svetlana 572b. The painted steel cabinet used doublelapped joint construction, giving excellent rigidity and rf screening. If you think your odds of having a problem were high using two tubes. Each tube has a heavy duty graphite anode, low loss which ceramic base, superior titanium getter and legendary quality.

If the al811a plate voltage runs that high it is exceeding the. New taylor 572b tubes causing issues in ameritron al811hd. Each taylor tubes 572b is tested by the engineering staff at rf. Ameritron al572 linear amplifier 0 watts amp 4 x 572b tubes near legal limit. We also sell taylor brand tubes, the taylor brand 3500zg offers a two year warranty, and it is a. It will test nearly all type of tubes from the late 30s 1970s including compactrons etc. And, to be frank, it still is, as it does cover about 80% of commonly used tubes in hifi and music amplifiers.

Testing at the about 5v at least culls out the duds and real weak 811s and 572b s which then get a further evaluation at v for regettering as well as using the published curves to select those to run in an amp as the final test. Tubes can be visually inspected for obvious faults. I did read the manul and got input from where i got the amp. Using solidstate transceivers with older tube amplifiers a collection of hints and kinks from the pages of qst. About arcing or gassy 572b tube the resource is currently listed in in a single category.

An excellent low priced emission type tester for tubes of the 40s 70s types. Of 6cl6s that are available on the market, this is the best there is. This particular tube is unstable on higher hf bands even with a 47k filament ct leak resistance. A new approach in fast, accurate tube testing, the wt110 automatic electron tube tester utilizes punched cardscomplete transconductance test setup takes only secondsthe wt110a tests for gas, shorts, interelectrode leakage and overall tube quality. Matched pair tested by factory shuguang 572b vacuum tube for. Dx engineering 572b power tubes dxe572b free shipping.

With over 60 years of success in the vacuum tube business, we provide the highest standard of quality and service. Indian head test pattern, 6pin base with dual top caps for grid4 and anode. These devices are we believe still available from svetlana. Power tube selection charts for highpower audioamplifiers eimac,rcapage 1, rca page 2. Dx engineering 572b power tubes are the best choice for use in all types of rf power amplifiers and in all installation attitudes. The rf parts 3500zg transmitting tube is the highest quality transmitting tube that money can buy, for decades rf parts has been testing 3500z tubes, and we only sell the best 3500zg that pass our tube testing. Newer models wont have that capacity, but they can usually test 6k11s as one example for the ampeg owners out there. I used a similar approach only i use a dummy load and rf to condition my tubes. Click here or on the image above for a larger version. Older radio repairmen needed to test 47s, while tv repairmen couldnt care less.