Testing 572b tubes pdf

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. Taylor tubes is the preferred choice for fl2100, sb200sb201, 10160l, 30l1, etc. 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. Tubes for industry, music, ham radio, the audiophile. Using solidstate transceivers with older tube amplifiers a collection of hints and kinks from the pages of qst. Throughout history, to speed development and reduce tooling costs, newer tubes use tooling from older tubes. For the displays i understand cost was the design mantra. Dx engineering 572b power tube dxe 572b dx engineering 572b power tubes are available for allpurpose amateur radio service. Test results will vary depending on the type and brand of tube checker. My bias circuit uses a 10 watt zener diode having a value of 4.

I had no intention of restoring the old rig, but the idea of designing another linear amplifier using that enormous chassis. Highmu power triode tube, for use in class ab2, class b, class c rf, and audio amplifiers. One way to tell a tube is bad is to put it in a tube tester. Nde technologies for the examination of heat exchangers.

After each modification the amplifier was firmly tested and plates never becames red. At the time, this list of tubes looked fairly exhaustive. Trending price is based on prices over last 90 days. 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. Dx engineering 572b power tubes dxe572b free shipping on. They have proven themselves in all kinds of amateur, commercial, and military service. I was told that improper tuning could be the cause. Click here or on the image above for a larger version. 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.

If replacing tubes in an al572 amplifier, be sure to update the grid circuit and add voltage clamps on the filament leads. Yes, i have a tube tester that will do transmitting tubes. These 572bs are a modern version of the venerable vacuum tube that has been around for a long, long time. Tubes can be visually inspected for obvious faults.

Vacuum tubes radio tubes 5,000 different tubes in stock. If the al811a plate voltage runs that high it is exceeding the. Base indexed and internal structure aligned and supported for both horizontal and vertical operation. I dont think shuguang destroyed all of the returns, salvaging most for sell to domestic dealers. 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. For other taylor tubes, see the entire 1945 taylor tube catalog in pdf format note, 1. A low cost, easy to build diy valvetube tester valve heaven. A 6h6 rectifies one of the ac filament voltage for the neon bulb used in the shorts test. Maximum output power will be attainable, but the tube plates will literally deform and eventually fail with repeated use. 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. 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.

A western electric model tube tester manufactured by hickok has 300b settings. 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. How to find out if an electronic tube is good with. Base indexed and internal structure aligned and supported for. The 572b is a replacement valve for the 811 transmitting tube. Describe your experience with the chinese 572b tubes and tell us why you give it the rating you did required. This is a list of vacuum tubes or thermionic valves, and lowpressure gasfilled tubes. Newer models wont have that capacity, but they can usually test 6k11s as one example for the ampeg owners out there. 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. The svetlana 572b may be operated with its axis vertical and the base down, or horizontally with pins 1 and 4 in. 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. Mar 21, 2018 audio lecture 28, how to insert 300b 811 572b 2a3 tubes into ux4 sockets duration. These devices are we believe still available from svetlana. In14 nixie tube excellent used 100% working in14 14. 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. Richardson electronics is the premier supplier of electron vacuum devices in the world.

An excellent low priced emission type tester for tubes of the 40s 70s types. Well im back in the same place as before low output. This is the single best favor you can do your 32s1 s3 or kwm2 transmitter. This particular tube is unstable on higher hf bands even with a 47k filament ct leak resistance. I did read the manul and got input from where i got the amp.

With over 60 years of success in the vacuum tube business, we provide the highest standard of quality and service. Its interesting to me that the old rca 811 as shown has a much higher pervience cathode than did the svetlana 572b. The numbers are not entirely fair because swr to 572b s was worser than to original tubes. Each taylor tubes 572b is tested by the engineering staff at rf. 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. Ameritron al572 linear amplifier 0 watts amp 4 x 572b tubes near legal limit. Out of those, about 60% of the tubes had excessively low anode voltage breakdown. You can build a test jig from junk parts for big rf tubes. We carry over 5,000 radio and vacuum tubes in stock every day and we ship world wide. 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. Dx engineering 572b power tubes dxe572b free shipping. About arcing or gassy 572b tube the resource is currently listed in in a single category. 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. Highmu power triode for use in class ab2, class b, class c rf, and audio amplifiers.

Just for the sake or understanding, when testing a vacuum tube, there is no such thing as new tube, near nos or nos test reading. Older radio repairmen needed to test 47s, while tv repairmen couldnt care less. Ameritrons exclusive parasitickiller effectively suppresses all parasitic oscillations. Ameritron 572b replacement final tubes are available for the ameritron al572 series of 1,300 watt power amplifiers. Simplest way to add most 4 pin dht tubes to your design is to just suck it in and buy another transformer. Matched pair 2 rca 12bh7a gray plates tubes test nos.

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. Our commitment to providing the best products to meet our customers needs is second to none. It selfbiases off, with a completely open cathode return, at about 40 volts. Therefore, a sumiere test was done with the two types. Oct 23, 2011 after one of my stock tubes shorted out cause unknown i ordered a matched set of taylor 572b s. Of the two plate curves i posted, neither one would pass the paofri test. Radiotron model uv 200 vacuum tube rare experimental use only. I suspect that these tubes are now being offered on ebay.

New taylor 572b tubes causing issues in ameritron al811hd. All tubes i have tested have within a few percent same gain at normal drive power levels. If your tester will set up for an 811, it will also test a 572b. The hickok 752752a list the 811a as does my tv7c which indicates the transformer is adequate for those models. 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.

Pdf format or 8 data sheets from the rca tt5 transmitting tube manual. Ameritrons exclusive instantaneous rf bias completely turns off the 572b tubes between words and dots and dashes. Ameritrons exclusive dynamic alc gives you high level, low distortion rf processing it. Eico tube testers i know of that has a vacuum tube under the panel. The 812 was a moderately low mu tube, primarily intended for grid driven modulator service. 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. It will test nearly all type of tubes from the late 30s 1970s including compactrons etc. Matched pair tested by factory shuguang 572b vacuum tube for. The 572b is an indirect descendent of the 811 tube. Each tube has a heavy duty graphite anode, low loss which ceramic base, superior titanium getter and legendary quality. 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. The envelope, anode, and filament are identical to the 811 tube.

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. And, to be frank, it still is, as it does cover about 80% of commonly used tubes in hifi and music amplifiers. Get the best deals on 572b tubes when you shop the largest online. Can most guitar amp tubes be tested the way you showed us with the 12ax7b. We also sell taylor brand tubes, the taylor brand 3500zg offers a two year warranty, and it is a. The main category is vacuum tube resources that is about vacuum tube, electron tube, thermionic valve, valve resources.

Typical operating conditions in amateur service are a va of 2,400 v and an output power from a pair of 400w. Inaccuracy in test results could occur if a discontinuity encountered differs in geometry from calibration discontinuities. Dx engineering 572b power tubes are the best choice for use in all types of rf power amplifiers and in all installation attitudes. How to test and align a linear amplifier qst may 1952, pp. If you think your odds of having a problem were high using two tubes. The al572 uses four rugged fully neutralized tubes. 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.

How to build the dx811a allband linear amplifier cq. I installed them this morning and powered up the amp. The few tubes that seem to recover from prolonged filament operation quickly revert back to original behavior after being cold for a few hours. Power tube selection charts for highpower audioamplifiers eimac,rcapage 1, rca page 2.

Nos nib mullard el34 tube xf4 code gm tested very strong. Taylor is the preferred choice for fl2100, sb200sb201, 10160l, 30l1, etc. 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. If you think your odds of having a problem were high using two tubes, imagine using four at a time. If you arent sure about which valve you need, or what tubes you can substitute, let us help you. Older tube testers will have provision for testing 456 pin tubes. A simple query if i may, have looked at the readings for the 3 tubes you. I know some who sell tubes on ebay and other venues use such. New tubes just like used ones will vary considerably in their mutual conductance measured in micromhos or gm for short. My conclusion is it makes no sense to install expensive 572b s if one not simultaneously increase anode voltage. Designed especially for tv and general electron tube testing. I would also like to test some recently aquired 572b tubes jim, there are a couple of things that come to mind.

I also know my hickok 752a i sold a few years ago has 811 test parameters. 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. If the free circulation of air around the tube is re stricted, a small fan. For my 572b test i will place a muffin fan directed towards the tube a few inches away.

A normal tube, at least all the normal samples i have about 50 tubes of various types, self bias to about 40 volts. Indian head test pattern, 6pin base with dual top caps for grid4 and anode. These eico tube testers calibrate almost too easily. I used a similar approach only i use a dummy load and rf to condition my tubes. The painted steel cabinet used doublelapped joint construction, giving excellent rigidity and rf screening. Of 6cl6s that are available on the market, this is the best there is.