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