If its being run as an if amplifier the philips ech81 datasheet says g1 pin 2 is. Asus h81t is a thin miniitx motherboard based on the intel h81 chipset. For a double blind test wolfgang holtmann has sent tubes without any marking and with the tips broken. Vacuum tube 6aj8 ech81, triode, heptode antique electronic. Restoration of 19581959 grundig 2066 px amfmsw vacuum tube radio. The jj el34 ii is stronger than the original but not harsh sounding in any way. Substitutes are given as a guide only please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. You reach this tube or valve page from a search after clicking the tubes tab or by clicking a tube on a radio model page. This is a suitable replacement for any 6ca4ez81u709 fullwave rectifier tube type.
What is the difference between the tube ech81 and ech83. Antique radio forums view topic rogersmajestic r211. Triodeheptode fur regelbare mischstufen oder getrennte. Receiving tubes and foreign equivalents data collected from the russian book. With almost datasheets and the visitor counter indicates over 4000. This tube has a more compact plate structure than standard el34s. For reverb driver, we recommend smaller plate 12at7 such as electroharmonix 12at7ehwc. Philips pocket book franks electron tube data sheets. But any effect from the rectifier is relatively subtle compared to power or preamp tubes. Tube depot carries a selection of 12at7 ecc81 cv4024 pre amp vacuum tubes.
Ech81 tube datasheet, cross reference, circuit and application notes in pdf. Domestic receiving tubes and their foreign counterparts by. Tube cross reference letter nostalgic kits central. We also offer low noise option to eliminate potential issues. I 160 150 100 ma c 50 50 50 f u 245 352 497 v choke input f 50 hz u tr eff 2x250 2x350 2x450 v i 180 180 150 ma l 10 10 10 h u 199 288 378 v limiting values. Your address data will be saved by completing the registration. The el84 6bq5 was the only tube it had data for on the scroll chart. I used a european to american tube cross reference booklet. And another 1ad superhet ech81 the radioboard forums. Here comes the most revolutionary and outrageous tube preamplifier based on low voltage heptodetriode ech83 tube.
For use in the phase inverter position, we recommend the triode matched option. A different construction of the classic el34 tube that offers a different tonal palette than the original. Tube ech 81 or rohre ech81 id375, triodeheptode, noval, b9a and. Find great deals on ebay for ech81 tube and tube ef89. Since i am still fairly new to tube building i am surprised that so few components need to be changed when doubling up tubes. Dec 29, 2005 i read online somewhere that a 6v4ez80 can be used in place of a 6ca4ez81 tube. Last update 30 april 2008 radio constructors circuit archive valve superhet all pages open in new windows. I think its one of philips euro chassis that they put into a rogers magestic box. If 6an7 or ech81 tube is to be used in the oscillator, it must be shielded, otherwise the internal shielding of the tube, connected to its cathode will work as antenna, providing a noise injection path into the oscillator. Nos tube specification sheet nos tube specification sheet.
The tube is manufactured by the oktjbr, vinnitsa, ukraine. The ech81 acting as oscillator and mixer for am and the heptode being the first if amplifier on fm. Up for your consideration is a beautiful grundigmajestic model 4019u tube radio. Packed with advanced technologies, including an easytouse uefi bios and asus ai suite 3 software package, h81t is the perfect choice for allinone aio pcs and other slimline builds. This 19581959 grundig 2066 px amfmsw vacuum tube valve radio was in nice cosmetic condition when i found it on august 18, 2004. Data from or other sources as supplied by john atwood.
Vacuum tube 6686 e81l, pentode, power amplifier antique. Nos vintage mullard ez81 6ca4 u709 fullwave rectifier 1962 dgetter. Receptor for emission frequency modulated fm control its electrodes are connected to the output. Before the advent of semiconductor devices, thousands of tube types were used in consumer and industrial electronics. To prevent damage to equipment, it would be wise to double check with a good tube manual before actually doing a substitution. Nos vintage mullard ez81 6ca4 u709 fullwave rectifier. Not perfect prints and without boxes, but nos, tested 100% 24. Also i have halved the value and doubled up the output tube grid resistors. Ech 81 6 aj 8 6i1p vacuum tube triode heptode 100 v, 160 v. My very old rca book doesnt list it but my old mullard one does. View online or download asus h81mcs user manual, manual. Tube ech 81 or rohre ech81 id375, triodeheptode, noval, b9a and frequency converter shown. All tubes new, military equipment and have otk mark.
The 6e1p 6br5 em80 magic eye and other indicator tubes. However, i disagree that it always has the least impact on tone of any tube in the amp, however. The ech81 triode heptode was designed in 1954 for the role of frequency changer mixer in superhet receivers for am reception. Eirc electronic tubes factory data sheet ecc8112at7 page 1 of 4 telephone. I found myself a 6i1pech816aj8 tube and i wanna mess around with it. If this checks out as ok, ill start to put together a shopping list for the rest of the project components. Before we present our results, i would like to show how i and what resulted.
This is a list of vacuum tubes or thermionic valves, and lowpressure gasfilled tubes, or discharge tubes. Capacitor input f 50 hz u tr eff 2x250 2x350 2x450 v r t 2x150 2x230 2x310. Description the 6i1p 61 triodeheptode has been designed for frequency conversion in electronic devices. Please see the substitutes at the top of the page for more details. A shield can be easily cut and rolled from a food can tin metal, as shown in an example of fleetwood radio conversion fig. Bold designators are close or identical, italic designators are different ratings, different pinouts or different filament voltages. This concept uses a resonant circuit, tuned to the central intermediate frequency of the fm signal where the antiphase signals at both ends v4 and v5 are each peakdetected by a diode and their outputs subtracted. Any electronic component is not just what it is on paper.
The 6i1p triodeheptodes are miniature devices enclosed in glass bulb and provided with ninepin base leads and an indirectly heated oxidecoated cathode. Tube possible substitute western substitute ec86 6s3p. However, it was a weak performer, incapable of producing the big, robust audio for which these radios earned a strong reputation. Its the rogers magestic r211a made by philips electronics in toronto. Tubes in the tube column are directly replaceable with tubes in the replacement column. Before the introduction of the eq40 as fm detector, the only practical method for fmdetection was the fosterseeley frequency discriminator. The pentagrid converter is a type of radio receiving valve vacuum tube with five grids used as. Deze heptodetriode uit 1952 is ontworpen als mengbuis. Vacuum tube 6aj8 ech81, triode, heptode amplified parts.
Tthe tube lineup is em84, ech81, ef89, ebc81, ez80 and el95. Handmade electronic devices that make our life a little bit less boring. Vacuum tube 6aj8 ech81, triode, heptode triodeheptode for use in f. Jacob has used it in many of his transmitter and receiver designs. The el84 tube may have failed the gas test, meaning it did not have a pure vacuum due to high usage. Fellow radiophiles, in recent discussions with jacob roschy, it has become apparent how popular and versatile the ech81 tube is. Ecc8112at7 page 1 of 4 franks electron tube data sheets. Project ech81 versus ech83 measuring of system dimensions we started a project with the question. I read online somewhere that a 6v4ez80 can be used in place of a 6ca4ez81 tube. If you have the service data i would appreciate looking at it. The jj el34 ii has an increased low to lowmid end with plenty of headroom to spare. The enclosure is a toy car, which adds vintage flavour to the middle frequencies. Mullards ech81 became popular with the move to miniature ninepin valves.
Tube uch 81 or rohre uch81 id373, triodeheptode, noval, b9a and frequency converter shown. The 6n24p double triode is designed for amplification of highfrequency voltage in cascade circuits of radio equipment of wide use. To do so, please contact the operator of this page. Nos mullard ez81 u709 6ca4 nos d getter these are the best sounding ez81 made in the late 1950s early 60s with the d getter.
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