Ecc801s vs ecc81 pdf

By the operating manual of the tester the typical value of the mc mutual conductance of the new ecc81 12at7 tube is. Boxes are originally factory sealed, in original 5packs. These are made in west germany, have a diamond bottem and original boxes. Ecc81 double triode 1955 components datasheet pdf data sheet free from. Please see the substitutes at the top of the page for more details. Pair of telefunken for tektronix 12at7 ecc81 nos sealed vacuum tubes. Compared to the earlier mullard with the folded plate these consistently last longer, have. The ecc81 tube type is equivalent to the north american 12at7 tube and can be used in any 12at7 or ecc81 circuit.

The mullard ecc81 was designed for rf use and is of medium impedance. Tube rolling thread for stereomour ii bottlehead forum. What this means is that the knee frequency of the coupling cap that is typically connected to the plate resistor will usually be much higher with the 12at7. Read i rolled a couple of nos t7s, and liked the telefunken ecc801s best read. Used ecc801s ecc81,12at7,12at7wa,cv455,cv4024,6201 rsd. The tfk ecc801s is the best ecc81 ever made on this planet. Availability usually ships in 24 hours product code. Telefunken ecc801s is almost the worst t7 tube i have heard from old stock family. A good choice for phase inverters and reverb circuits calling for 12at7 tubes. Whats the difference between an 12at7 and 12ax7 preamp tube. But its also very suitable for audio preamplifers and phase inverters. However for audio amplifier use the special quality valves can.

Ricevitore in superreazione con valvola ecc81 12at7 test. A guide to ecc83 type preamp valves valve tube guitar amps. The ecc81 was the first double triode with noval socket introduced by valvo in 1951. Gittervorapannung 939 0673 philips ecc81 8 vgv 7r031s5 i. It was used as a frequency changer in five station television sets. Can be also used as replacement for 12ax7 in many applications.

Most tubes of this type were not made in the netherlands. These specifications are provided asis, with no warranty of any kind. Indeed, even though i have been using 12at7based equipment since the mid90s, until now, i have not been able to gather enough telefunken 12at7s 1 to assemble matched quads, 2 to determine what they truly sound like, and 3 to write up a. Jj ecc803 discussion in amps and cabs started by mvd18969, sep 22, 2008. Tube depot carries a selection of 12at7 ecc81 cv4024 pre amp vacuum tubes. The 12at7 valve is a small preamplifier valve with two identical triodes both of which have a high voltage gain. Noval typical characteristics and operating conditions anode voltage va 100 170 200 250 v grid voltage vg1,0 1,0 1,0 2,0 v anode current ia 3,0 8,5 11,5 10 ma. Matched pairs famous nos brimar d9 tubes telefunken ecc801s 12at7 ecc81 6414. In both ac and dc cases, the filaments have small series resistors to finetune the voltage. Gec a2900, ecc801s, e81cc, ecc81 priced to sell headphone. Noval u f 6,3 or 12,6 v i f 300 or 150 ma typical characteristic. Mullard cv402412at7 these are in royal air force boxes, made in great britain, and are wonderful. Please mind some minor differences from a normal ecc81 type. Ecc81 is available as special quality tube from telefunken and is called ecc801s.

It belongs to a large family of dual triode vacuum tubes which share the same pinout eia 9a, including in particular the very commonly used lowmu 12au7 and highmu 12ax7. For reverb driver, we recommend smaller plate 12at7 such as electroharmonix 12at7ehwc. Gittervorapannung 939 0673 philips ecc818 vgv 7r031s5 i. We also offer low noise option to eliminate potential issues. As you can see, it shares similar pin connections with its cousins, but these tubes are not interchangeable. The absolute king ecc81 12at7 e81cc 6201 ecc801s type tubes. Whats the difference between an 12at7 and 12ax7 preamp. For more information on 12at7 vacuum tubes including pinouts, ratings, datasheets. This is characteristic for ecc801s, but there has allways been a lot of restamping ecc801s on plain ecc81. Mullard ecc801s question steve hoffman music forums. We have the ecc81 ecc82 ecc83 was introduced specifically for audio applications way back in 1954 to replace the earlier 6sl7 octal based valves. Picture of the actual tubes you will receive boxes displayed for hisoric representation and not included. The most sought after version of ecc81 tube and virtually unobtanium.

Heating is indirect by ac od dc, with serial or parallel supply. Test values are tight and close to the center value for all tubes no matter which one i take out of the pack. Sylvania 6201 blackplates come in both 2mica and 3mica versions. This tube carries all three designators cv4024 12at7 m8162 matched pair cost. Reject limits have to be guessed by people who know how to do this. Seeking a ultra low noise ultra musical ecc81 12at7 for your phono stage or line stage here it is. We do not recommend 12at7s as a 12ax7 substitution. Ecc81,ecc82,ecc83 versus ecc801s, ecc802s, ecc803s. Description voted best sounding top 4 by the tubemuseum audiophiles favorite list winner. Use of these parameters shall be entirely at the users own risk.

Frank philipse pocnet mirror patrik schindler, ecc801s. Given for each tube system 1 and system 2 in micromhos. These are geniuine philips ecc81 12at7, made in france, ring getter, single plate hole and tk2 f3i5 codes. Hardly anything or anyone uses 12at7s, so very little has been said about telefunkens ecc81 12at7. Telefunken ecc81 used philips jan new arc used ge 6201 3 mica, sq gtr nos telefunken ecc81 nos telefunken ecc801s nos the 12at7 makes a surprising contribution to the sound of the 6 pieces of tube gear i use it in and ive played with this type more than most others. The ecc81 also makes an excellent phase splitter in modern audio applications. The 6sl7 type of valve has the same base as output valves such as the 6v6, 6l6, el34 etc and were bulky, so the ecc8x family made a lower power, much smaller preamp valve. For use in the phase inverter position, we recommend the triode matched option. For reaching the design parameters of the original valve only valves that are directly equivalent should be used.

They have a higher plate current and transconductance, and are commonly used as reverb drivers and phase inverters. The 12at7 also known in europe by the mullardphilips tube designation of ecc81 is a miniature 9pin mediumgain x60 dualtriode vacuum tube popular in guitar amplifiers. The 12at7 is a highfrequency twin triode in a small 9pin miniature glass package. The tele ecc801s is the holy grail of all 12at7 tubes. Ecc81 receiving valve components datasheet pdf data sheet free from. This is the most popular and sought after 12at7 ever. The most sought after version of ecc81 tube and virtually. Mullard ecc81 12at7 6201 gold pin when only the finest possible 12at7 ecc81 will do.

Get the best deals on telefunken ecc801s when you shop the largest online selection at. Data sheet containing technical information, illustrations and photographs of ecc81 mullard tube12at7 rca valve 12at7 tube data tel. They do function in every circuit meant to use ecc81 but are rated for higher standards compared to your typical ecc81 and have more gain. Ecc81 12at7jj tesla jj tesla the jj ecc81 is an excellent modern valve that provides low noise and low microphonics. The 12at7 is not the most commonly used preamp tube in audio. Each tube wrapped with a cardboard inner liner and pin protector. Rare telefunken nosnib ecc801s 12at7 ecc81 tube germany test nos. As you can see, it shares similar pin connections with its cousins, but these tubes are not. Ive got some excess hum on the hi gain channel for a new channel switcher peavey ultra 112 that i. The heath tube is horribly sensitive for touching the table, the tube glass, knocking with a fingertip. That distinction probably falls to the 12ax7, especially when you add guitar amps to the mix. Gec mullard ecc81 cv455 ecc801s d getter single nos nib collectors tube. An ecc801s tube is build within the 12at7wa6201 spec. U a 300 v w a 2,5 w i k 15 ma u g 50 v u kf 90 v r g 1 m.

The jj ecc81 12at7 tube is a low noise and low microphonic preamp tube. In this application the oscillator triode would be the first to cease working. I would characterise it by first suggesting the two extremes of sound. Also, the 12at7 has bandwidth to 40k as opposed to the 12ax7s 10k bandwidth. These can be bought originally closed, and then you buy them as collectors. Ecc81 is 12at7 medium gain preamplifying double triode. Well not with those, they are real ecc801s, for sure. Heater is center tapped to permit operation in series at 12. Discussion in audio hardware started by alan g, mar 9, 2006. Ecc8112at7 quick reference data heating franks electron tube. I can hear a huge increase in 3d sonic holography with the ecc801s 6201 over the ecc81 12at7.

Like otm said, the 12at7 has much lower internal plate resistance rp. Super popular for vtl, manley, atmasphere, and others. Ecc81 12at7rft rft just in the rft ecc81 is a very high quality ecc8112at7 valve which was made in the east german rft. Double triode quick reference data anode current ia10ma transcoductance s5,5mav amplification 60 heating heating is indirect by ac od dc, with serial or parallel supply. The cv4024 m8162 is a special quality version of the ecc81 12at7. But its also very suitable for audio preamplifers and phase inverters in push pull output amplifiers.