Base indexed and internal structure aligned and supported for both. If the al811a plate voltage runs that high it is exceeding the. Limited 1 year transmitter tube warranty against manufacturing defects and workmanship through rf parts company. The taylor select 811a is the best quality tube in current production. I would also like to test some recently aquired 572b tubes jim, there are a couple of things that come to mind. Svetlana 811a highmu power tetrode he svetlanatm 8 11a is a p o w er triode in ten d ed for use, tube capability. All of these amps, like the al811h, push the 811 tubes pretty hard. The 2a3 tube was introduced in 1932, designed specifically for the audio amplifier output stage. The modern taylor 572b is virtually an exact copy of the original taylor 572bt160l tube.
Throughout history, to speed development and reduce tooling costs, newer tubes use tooling from older tubes. Sovtek 2a3 is a close replica of classic american 2a3 tubes, excellent for classical sources. Taylor is the preferred choice for fl2100, sb200sb201, 10160l, 30l1, etc. Aug 29, 2017 upgraded the 811a tubes in my al811 amplifier to 572b tubes. How to build the dx811a allband linear amplifier cq. Well help you to work out whether its worth paying extra for a highend version or whether youre getting just as good a deal by getting the cheaper item. One of the best sources of information on the matter is tom w8jis site. These 572bs are a modern version of the venerable vacuum tube that has been around for a long, long time. Complete primo amplifier tubes wth matched gain, plate current power amp tubes. Base indexed and internal structure aligned and supported for both horizontal and vertical operation. Joe, just looked at the parts list for the al811 and al811h. Mar 21, 2018 audio lecture 28, how to insert 300b 811 572b 2a3 tubes into ux4 sockets duration. 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 svetlana 572b also features a low loss ceramic base and a bonded ceramic plate cap thermal insulator for high power rf transmitting tube capability. Apr 16, 2018 ameritron 811a replacement power tubes are available for allpurpose amateur radio service. Depending on the style of music you play or enjoy we have a tube set that will fit your needs. I have herd that i can put 572b tubes in it instead of the 811a s no mod required. Vacuum tube 811a, triode, power amplifier, china antique. Matchede pair psvane 811a audio valve vacuum tube instead.
Jun 10, 2000 fs 811 nos jan sylvania electron tubes 3. This is the single best favor you can do your 32s1 s3 or kwm2 transmitter. We had 1 of this item in stock at the time of the last update. Primo higher rated tubes and still good value tube set. With the 572b tubes, the amp now puts out around 750 watts. Dx engineering 572b power tube dxe 572b dx engineering 572b power tubes are available for allpurpose amateur radio service. If youre still in two minds about 572b tubes and are thinking about choosing a similar product, aliexpress is a great place to compare prices and sellers. 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. Despite being relatively low powered, 2a3 still is the triode of choice for many highend audio amplifiers and diy projects. Tubes free delivery possible on eligible purchases.
T obtained by grid resistor of value shown or by partial selfdias methods. The al811h amp is rated for 800 watts pep output with either 811a or 572b tubes installed, but i think that number is a little high myself. About arcing or gassy 572b tube the resource is currently listed in in a single category. From hf, vhf, uhf, 50mhz, 70mhz and 144mhz through to 432mhz and 1296mhz the dx shop supplies linear amplifiers, antennas, aerials, masthead preamplifiers, lna, coaxial cables and connectors, sequencers and amplifiers for your ham radio station. Typical operating conditions in amateur service are a va of 2,400 v and an output power from a pair of 400w. All listings current page auction buy it now classified ads. Which brings me back to my original question about running three 572bs in an al811 vs. Ameritron 811a replacement power tubes 3800811a free. The chinese sino 572b highmu power triode is manufactured by shuguang in china.
For general purpose or replacement use in single ended tube output. Rca 811 811a tube 811a rca 811 tube dsager00032 scans048 tube 811 text. The main category is vacuum tube resources that is about vacuum tube, electron tube, thermionic valve, valve resources. This is about 600 watts carrier or pep cw output power. Of 6cl6s that are available on the market, this is the best there is. The graphite anode is connected to the top cap, the insulation is ceramic and the grid. Pdf 92cm7i38 tube 811a 811a 811a tube tube 812a 2a3 power triode 2a3 tube 811a audio amplifier.
The 811h has a heavy duty graphic plate for increased overload capacity. Feb 19, 2016 for some reason, i seem to have become a little obsessed with 811a tubes whilst playing around with an ameritron al811 amplifier. Tube 811a or rohre 811a id19220, transmitting triode, air cooled, uxbase 4 pins 2 thick, usa 1924, ux and poweroutput shown. Dx engineering introduces new 572b tubes for power. The 572b is a replacement valve for the 811 transmitting tube. The 812 was a moderately low mu tube, primarily intended for grid driven modulator service. If the al 811a plate voltage runs that high it is exceeding the. Emission increases as the thorium migrates towards the surface of the filament wire. These devices are we believe still available from svetlana. If no bias is used, the resting plate current will be 150 ma for the four tubes. The svetlana 572b may be operated with its axis vertical and the base down, or horizontally with pins 1 and 4 in. If the free circulation of air around the tube is re stricted.
Buy matchede pair psvane 811a audio valve vacuum tube instead of 811a 811 fu811. The dx shop antennas, amplifiers and accessories for the dedicated radio amateur. Great quality 572 b for use in class ab2, class b, class c rf, and audio amplifiers. Dx engineering introduces new 572b tubes for power amplifiers. They have proven themselves in all kinds of amateur, commercial, and military service. Please see the substitutes at the top of the page for more details. Al811 811a tube upgrade to dx engineering 572b youtube. The 572b is an indirect descendent of the 811 tube. 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. The svetlana 572b also features a low loss ceramic base and a bondedceramicplate cap thermal insulator for high power rf transmitting tube capability. The big advantage using 572s is the tube life when operated in place of 811s will be greatly extended, assuming the tubes are properly manufactured.
They are all rated at a kilowatt dc plate input on cw, as is the al811h. These heavyduty 811as are a modern version of the venerable vacuum tube that has been around for a long, long time. Each taylor select tube is tested by rf parts company prior to shipment. Typical operating conditions in amateur service are a va of 2,400 v and an output power from a. Svetlana power tubes are new to the western world, however, we have been. Matchede pair psvane 811a audio valve vacuum tube instead of. Ideal for the collins 30l1 and similar equipment where tubes mount horizontal.
Tube list within range of tubes 100th 991 at abc vacuum tubes 3. The modern taylor 572b is virtually an exact copy of the original taylor 572b t160l tube. Usage tests show it to be equal to the respected rca 811a and svetlana 811a. You also can probably run a bit more cw power input and output without cooking the anodes, although ssb power wont change. Dx engineering 572b power tube dxe572b dx engineering 572b power tubes are available for allpurpose amateur radio service. Tube output 30 75 watts single ended hifi 16271642 series. With the original 811 tubes in the amp, it usually put out around 650 watts. Chinese 811a available in singles or matched pairs.
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