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	Vacuum tube and electron vacuum tube and audio vacuum tube 12AX7 at LOW Prices!
		The 12AX7 vacuum tube was originally intended as miniature form-factor follow-on to the 6SN7 vacuum tube family of dual-triode low-cost amplifier tubes for audio and computer applications.
		The 12AX7 is the most common member of a huge family of miniature twin-triode type of vacuum tube types.
		Presently the 12AX7 vacuum tube is made in various versions in Russia, China, and Slovokia and one in Serbia, for a total annual production figure of 2 million units (estimated).
	www.tejastubes.com (760 words)

	HammondWiki - Kons EQAnd Overdrive Circuit (Site not responding. Last check: )
		The Plate 1 of the 12AX7 is connected to the HT high DC voltage via a 100 K ohms 1 watt resistor.
		The output of the 12AX7 gain stage Plate 1 is safely decoupled with a 10 mf 450 volt capacitor and this is followed by the 25 K ohms Gain stage 2 gain control.
		I got the idea for the sweetening capacitors connected between the ground and the plate of the 12AX7 gain stage 2 because on the Leslie 122 valve amplifier circuit there is a high frequency suppression caused by the.0047 capacitors that are wired between the plates of the two 6550 power valves and the ground.
	www.dairiki.org /HammondWiki/KonsEQAndOverdriveCircuit?version=1 (1489 words)

	12AX7 at AllExperts
		12AX7 is a miniature dual triode vacuum tube of high gain.
		It was believed to be originally developed in 1946 by RCA engineers in Harrison, New Jersey under developmental number A-4522.
		Presently the 12AX7 is made in various versions by two factories in Russia, one in China, one in Slovakia, and one in Serbia, for a total annual production figure of 2 million units (estimated).
	en.allexperts.com /e/0/12AX7.htm (393 words)

	12AX7 - Wikipedia, the free encyclopedia
		12AX7 was originally intended as miniature form-factor follow-on to the 6SN7 family of dual-triode low-cost amplifier tubes for audio and computer applications.
		The 12AX7 is the most common member of a huge family of miniature twin-triode vacuum tubes.
		Presently the 12AX7 is made in various versions by two factories in Russia, one in China, one in Slovakia, and one in Serbia, for a total annual production figure of 2 million units (estimated).
	en.wikipedia.org /wiki/12AX7 (419 words)

	12AX7 Vacuum Tubes
		12AX7 A(WA), ECC83, 7025(A), 6681, 5751, 7729, 6057, 6932, 8759, 7494, M8137, CV492, CV4004, B759, B339, ECC803(S), E83CC, E803CC
		THE 12AX7 AND ECC83 ARE EXACTLY THE SAME TUBE.
		THE 12AX7 IS THE USA NAME/NUMBER AND ECC83 IS THE VERSION USED IN EUROPE.
	mysite.verizon.net /tubetronic/12ax7.htm (310 words)

	Pritchard Amps - XGPA Technology (Site not responding. Last check: )
		The non-constant plate resistance provides the major character needed to emulate the most popular triode, the 12AX7 because its voltage gain is very nearly constant.
		The clipping on the negative side is largely a function of grid conduction and the nature of the grid circuit.
		Notice that the distances between the crossings is quite similar for the 12AX7, but are increasingly greater when moving to the left for the XGPA™.
	www.pritchardamps.com /tech_talk/XGPA.HTM (840 words)

	12AX7 Tube Type Review
		Tung-Sol 12AX7 - There are only so many ways to describe tube tone and most have become cliché's.
		The Tung-Sol 12AX7 has the gain and drive of a Chinese 12AX7 and the pure tone of a Mullard or Brimar from the U.K. I've had two people come to me recently with amps they thought were in need of complete overhauls.
		The 12AX7 EH has a nice balanced sound, fairly low noise floor and excellent performance in terms of microphonics.
	thetubestore.com /12ax7review.html (1710 words)

	Billm Analyzes 12A*7 Family Tubes in a Blues Junior
		The first thing you need to know is that the ubiquitous 12AX7 dual triode is just one member of a family of tubes that have different amounts of gain.
		The 12AX7 has the most, and is rated at 100.
		The 5751 is also in the family, and is supposedly between a 12AX7 and a 12AT7.
	mywebpages.comcast.net /machrone/bjr/bjtubes.htm (1081 words)

	12AX7 Tube Type Review
		The Tung-Sol 12AX7 has the gain and drive of a Chinese 12AX7 and the pure tone of a Mullard or Brimar from the U.K. I've had two people come to me recently with amps they thought were in need of complete overhauls.
		The 12AX7 EH has a nice balanced sound, fairly low noise floor and excellent performance in terms of microphonics.
		JAN-Philips 5751 - While not really a 12AX7, it shares the same pin-out arrangement and is designed for less gain in favor of lower noise and microphonics.
	www.thetubestore.com /12ax7review.html (1710 words)

	Billm Analyzes 12A7 Family Tubes in a Blues Junior (Site not responding. Last check: )*
		The first thing you need to know is that the ubiquitous 12AX7 dual triode is just one member of a family of tubes that have different amounts of gain.
		The 12AX7 has the most, and is rated at 100.
		The 5751 is also in the family, and is supposedly between a 12AX7 and a 12AT7.
	home.comcast.net /~machrone/bjr/bjtubes.htm (1081 words)

	Dave's Homemade Audio Amplifier using a 12AX7 and 6N6
		The preamp is a 12AX7 with a 6N6 output stage.
		The preamp is the 12AX7 tubes connected using no cathode bypass capacitors.
		There is a negative feedback loop from the output transformer back to the cathode of the second section of the 12AX7.
	www.schmarder.com /radios/amplifiers/12ax7-6n6.htm (697 words)

	12AX7 Vacuum Audio Tube Specifications and Characteristics
		The construction of the 12AX7 / ECC83 is such that noise and microphony are reduced to a minimum.
		Hum is reduced by the use of a coiled tungsten heater.
		The 12AX7 / ECC83 is particularly suited for use in resistance - coupled voltage amplifiers such as those used in the preamplifier and input stages of Hi-Fi amplifiers, phase inverters, multivibrators and numerous industrial control circuits where high voltage gain is desired.
	www.kbapps.com /audio/tubespecs/12ax7p01.html (155 words)

	12AX7 Vacuum Tube List
		The 5751 has the same plate resistance as the 12AX7, but the gain factor is only 70 compared to 100 for the 12AX7.
		The gain factor of the 12AX7 is 100 and the gain factor for the 5751 is 70.
		According to the GE technical manual, the 5751 is a special quality tube for use in critical industrial and military applications in which operational dependability is of primary importance.
	www.vacuumtubes.com /12ax7.html (3121 words)

	NEW! Svetlana "Winged C" 12AX7 SOLD OUT
		The Svetlana 12AX7 is a miniature glass-envelope small-signal dual triode intended for use as a low-noise preamplifier for audio applications.
		All ratings of the Svetlana 12AX7 meet or exceed those of the original version; top-quality cathode materials and extensive aging yield outstanding performance in high-fidelity amplifiers.
		The Svetlana 12AX7 is made exclusively at the Svetlana Electron Devices factory in St. Petersburg, Russia.
	www.torresengineering.com /nossyl12ax.html (188 words)

	Tip #13
		After all, the 12AX7 is a small signal or preamp tube intended for voltage amplification.
		It is difficult to definitively assign a particular personality to a given tube type because ultimate performance depends in part on the amp's operating point and the quality of the power supply and output transformer.
		In this area, the miniature 12AX7 came close to equaling the magic of the KT66 and KT88.
	www.blackdahlia.com /tipindex/Tip__13/tip__13.html (2315 words)

	[No title]
		From: Albert Boulanger Subject: The Great 12AX7 Shoot Out Date: 3 Sep 90 18:18:37 GMT This is posted for a freind.
		Two amplifiers were chosen for the evaluation, both of which use 12AX7 type dual triodes in their input circuitry.
		This amplifier is well suited to this application since all of the colorations and distortion products are audible due to the absence of loop feedback, output linearity is good due to use of a limited amount of current feedback in the cathode circuits of the output tubes.
	margo.student.utwente.nl /el/tubes/12AX7buismerkentest.txt (1242 words)

	RCA 12ax7 Pspice Model Test
		The model will be demonstrated for a 12ax7 vacuum tube triode though it can be applied to any other type of triode easily.
		And because grid current levels are known to vary by as much as two orders of magnitude from tube to tube in a same manufacturing lot there is no reason to be too fussy with this side of the data as long as it corresponds moderately well.
		In the case of vacuum tube triodes both the grid and plate current functions exhibit transfer characteristics which make them ideal for polynomial interpolation; that is, both current function dependencies to Vpc are knee-less, unlike transistor and pentode devices, and their evolution from one constant input voltage curve to the next very is very gradual.
	www.lynx.bc.ca /~jc/model.html (3211 words)

	MusicPlayer Forums: Two "new" 12AX7 tubes (Site not responding. Last check: )
		I recently tested a new Sovtek 12AX7 that may be replacing the 12AX7WA.
		They are very quiet, at least -3dB down from the best of the other 12AX7 family tubes.
		The opinions of the forum moderators and participants are their own and do not reflect those of the Music Player Group.
	www.musicplayer.com /cgi-bin/ultimatebb.cgi?ubb=get_topic;f=19;t=005991;p=0 (523 words)

	BUY 12AX7A, 7025, ECC83 TUBES and choose your custom sound!
		The 12AX7 is the most important tube in your amp in determining how it's going to sound.
		The worst failure is bad tone, and since that is a matter of taste you may never experience what an incredible amp you already own.
		In the case of the 12AX7 the expected life of the tube will be decades.
	www.12ax7a.com (2713 words)

	diyAudio Forums - Simple follower with 12AX7
		OTOH, the 12AX7 is one of the best sounding tubes for gain stages, provided the input capacity doesn't hurt.
		The 12AX7 is meant to run at 1.2 mA with a plate supply of 250V=.
		I ditched the original 12AX7 because it would "self-bias" (is this the correct term?) too close to 0V using coupling capacitors and only 18V.
	www.diyaudio.com /forums/showthread.php?postid=24469 (1524 words)

	Ecc83 12ax7 4 (Site not responding. Last check: )
		4 new ecc83 jj tesla 12ax7 quad ecc83s
		12ax7 ecc83 near eq 6n2p eb tubes lot of 4
		12ax7 ecc83 7025 nr eq 6n2p ev Â qty 8
	www.online-orienteering.net /c152/Ecc83-12ax7-4.html (125 words)

	12ax7
		that the amplification factor of a 12AX7 is 100, there is a dramatic difference in these tubes.
		Telefunken and for use in valve microphones is a dream as super low noise.
		The Mazda 12AX7 grey plate are Mullards on hyper drive.
	www.guitaramplifierblueprinting.com /12ax7.html (7415 words)

	Hi-Fi Amp which 12AX7/ECC83?
		It is quite evident that the 12AX7 in there is not really up to the job in the Pre-amp section its micro phonic, and noisy.
		The JJ 12AX7 is really a great tube but because it is sounding very "middy" I do not use it for audio-purpose.
		In this case I would use the SED 12AX7 or the Ei Elite 12AX7 Gold.
	www.tube-town.de /ttforum.int/index.php?topic=65.new (521 words)

	BOI AudioWorks
		If you are looking to upgrade lower grade OEM 12AX7 tubes in your line stage or power amps, this is the de-facto upgrade tube.
		TungSol 12AX7 has small plate design with star micas that are well supported in the glass.
		For re-tubing a studio grade gear, Sovtek 12AX7LPS or TungSol 12AX7 is excellent and will give you comparable or better results than NOS in many cases.
	www.boiaudioworks.com /article.php?article=12AX7 (1103 words)

	I need some tube advice. [Specifically on 12ax7/5751 and 6080/6as7] - Head-Fi (Headphone Hi-Fi and Portable Audio)
		Yes it has less gain and noise than the 12ax7 (noise doesn't matter that much with the K340), but the general sound is the same.
		A 12AX7 biased at 1 mA is quite a poor performer when it comes to dynamic range in a driver stage.
		I will need two 12ax7 or 5751...I think I would like to stick with the 5751's over the 12ax7 as they are 70% gain and have lower noise.
	www6.head-fi.org /forums/showthread.php?t=145200 (3831 words)

	BUY 12AX7, ECC83 TUBE TYPES: Choose your custom sound. (Site not responding. Last check: )
		The 12AX7 is the most important tube in your amp in determining how it's going to sound.
		In the case of the 12AX7 the expected life of the tube will be decades.
		If by chance you were to choose the exact tubes that are in your amp now, it will sound stronger have better tone and increased reliability.
	www.guitarrepair.com /12AX7.html (2705 words)

	5751 "SRV Favorite" 12AX7 Tube Replacement
		The 5751 has a bit less gain than a 12AX7, (30% less) and a more linear tone, Smoother, with outstanding clarity and "chime." Overdrives in a different manner when compared to other tubes (not as harsh) Very cool.
		It is one of the Characteristics of the "chime" tone.
		The 5751 is not a 12AX7, it is a different tube with different character.
	www.torresengineering.com /5751jan.html (276 words)

	Hoffman Amplifiers - 6sl7 & 12ax7 in parallel &nb (Site not responding. Last check: )
		Hoffman Amplifiers - 6sl7 & 12ax7 in parallel &nb
		Hey Guys, I am building a 5F1 Champ type amp and i want to use a 6sl7 and a 12ax7 wired in parallel for a preamp.
		I haven't compared their data sheets in a long time, but the 6SL7 and 12AX7 are very similar electrically, although their curves may be a bit different.
	www.hoffmanamps.com /Forum/yabb2/YaBB.pl?num=1119522037 (579 words)

	Electrosonic Amplifiers -- Custom Built Tube Guitar Amplifiers
		Fatter, smoother, and warmer than the 12AX7, and with less gain (similar to the gain of a 12AT7- 70%).
		While not having quite the headroom(clean operation) that our regular 12AX7 preamp has, this preamp goes into very heavy (near metal) levels of overdrive, but with vintage smoothness and compression.
		First preamp stage operates in parallel, while the tone controls are cathode follower driven, similar to a classic plexi or bassman preamp.
	www.electrosonicamplifiers.com /options.php (1091 words)

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