Peavey super 6 6l6 gc str387 power tubes 2 per top of page. Woo audios fireflies is a tube headphone amplifier with a builtin 24bit384khz dac. The new 6c45 sovtek tube the best discover ive recently made is the new 6c45 tube. The el34 is the classic tube used in virtually every marshall amp produced. Very high transconductance, incredible linearity, very low noise and low plate resistance. If crackling or hissing changes with the tapping, you have probably found the problem. Woo audio wa7 gen 2 fireflies tube headphone amp wdacaudio advisor.
So one had much more current going thru it than the other. Other amps using higher powered transmitter tubes sound pretty good too. Beauty meets highperformance, wa7 is a vacuum tube headphone amplifier. Meanwhile the distortion products are lower than the 6922 but at 23 more gain see chart below. It delivers high power to drive demanding headphones to their full potential while maintaining a low noise floor for use with highly sensitive models. I get preamp tubes in a preamp, but ive found it difficult to find a clear explanation of what the driver and input tubes are actually doing, and their relative importance to the sound of the amp. I switched the 2 power amp tubes to see if it was the tube itself but this was not the case. Tubedepot carries a selection of 6l6 5881 kt66 7027 power vacuum tubes. But not all headphone amps use traditional power tubes as output tubes many use what speaker amps would use as drivers. Dave also fronts the band a different engine, and lives in.
The woo audio wa7 fireflies ampdac is a combination of high performance vacuum tube headphone amplifier with a builtin usb digitaltoanalog converter. Plate current 40 ma plate voltage 150 volts grid voltage 9 volts transconductance 45,000 umho 45 mav mu factor 52 interelectrode capacitance input 11 pf output 1. Effect pedals for guitar and bass, vacuum tubes, pro audio. Those amps you see with the glowing glass lightbulbs sticking out of them. It will cause no damage to run the amp briefly with one power tube missing. Popular in high powered audio and high end guitar amplifiers, characterized by greater distortion at a lower power compared to other power tubes. Includes matched tungsol 6550 power tubes, matched electro harmonix 6973 power tubes, eh driver tubes and an nos 0c3 voltage regulator tube. With both power tubes in, the one of the left does not light up, the one on the right barely lights up read as. Nothing warms up a volume knob like nine shiny tubes. To do this, could be used several tubes, including 437a, e55l pentode and the fantastic and expensive ec8020. With the original output tubes i was unable to adjust the bias, in either channel, to the correct 1. Tubes free delivery possible on eligible purchases. I can plug a set of dual dissimilar triodes into the same sockets with some component changes for far less power.
The power tube covers the range of sound that the tweed amps are famous for i use these in my 5e3 builds, i often recommend the customers try jj, eh, tungsol and mullard. Other types such as duo triodes and tubes in which. Tube mavens sovtek are now offering their 6c45 high mu single triode tube. Woo audio wa7 fireflies headampdac glowingly musical. Red plating vacuum tubes help steve hoffman music forums. Dave hunter is a writer and musician who has worked in both the u. In later years, 6550 tubes were also used in guitar amplifiers, notably in us versions of. Twenty watts are on tap as stare into the machined aluminum chassis that sit before me. There are no semiconductors used in the entire amplification path. Using the passport as the power supply instead they were yet less warm, suggesting they are drawing less power.
Charlie haden pat metheny beyond the missouri sky 180 gram vinyl lp firsttime 180gram vinyl out of print. They work as a deflectorshield and help the tube achieve its correct. Highquality russian 6s45pe 6c45pe tube, equivalent to the we437. When power tubes wear out, the low end starts to fade, and your amp will sound flat. It also affects the overall gain of the power amp, and the frequency compensation provided by components within the feedback loop one or more caps or resistors to help keep the power amp stable. Blue glow in tubes faq this document is intended to address the frequently asked questions reguarding the blue glow frequently seen in power electron tubes or valves. Output tube is used in place of power tube for a few reasons. Triode for hf amplifying in wide frequency amplifiers. It is still in use in audio applications, especially electric guitar amplifiers. The only logical thing i can come up with is maybe this tube is some sort of reserve for when an 8 ohm cabinet is. That being said, the panams stock tubes, while they sound good out of the box, have some shortcomings. Nos mullard el34 xf1, 2 unmatched nos singles available. Wa7 fireflies 2nd gen headphone amplifier dac woo audio.
Matched pair with double getters nos tube museum quality strong legendary american power tubes popular in fender musicman amps these topmica shields and solid fatboy disk getter rings are designed to deflect unwanted electron bombardment to prevent cathodepoisioning. Highquality russian 6p3se 6p3ce output beam tetrode. Introduced in 1949 by philips, the el34 is a high power pentode power tube commonly found in guitar amplifiers of european design. We power our unique loudspeakers with hand built tube amplifiers made with the. Woo audio wa7 gen 2 fireflies tube headphone amp wdac. I think it would be wrong of me to say which is best as sound is personal but there is no doubt that these tungsol tubes perform well in. Yellow jacket tube converter technical information. There are many different types of power amp tubes used. I got through the whole day on july 4th friday and didnt explode anything. I like the viva solista integrated amp, but, that is a pretty expensive unit it uses 845 output tubes, 6c45 drivers and 211s as rectifiers. For example, lets say you have an amp designed to use four 6l6gc power tubes, and you want to hear what it sounds like with four kt77s.
He is the author of the guitar amp handbook, the british amp invasion, guitar effects pedals, the fender telecaster, the gibson les paul, and a dozen other books, in addition to being a regular contributor to several prominent guitar magazines. The bias control adjusts for inconsistent wear between the two tubes of the pushpull pair. Woo audio wa7 fireflies headphone amplifier equipment. High power kinklesstetrode for use in amplifiers such as the marshall major. The 6550 became quite popular in american audio amps in 1950s. The power tubes in an amplifier are the larger sets of tubes. As you use your tube amp, tubes wear out due to the heat it generates. The new tubes biased correctly with no problem, and sound great.
The el34 delivers a very different sound than the 6l6 because the el34 is a pentode and the 6l6 is a beam tetrode. Theyre vacuum tubes, and theyre behind the amplification of the audio. The tubes are open ended into the vacuum chamber and they also sometimes have blue glow at e6 torr vacuum or better on new and very clean tubes. Complete set of new tubes for the leslie 351 cabinet. I bought a matchedquad set of these tubes to replace the output tubes on my van alstine modded dyna st70. If you arent sure about which valve you need, or what tubes you can substitute, let us help you. To confirm a noisy power tube, merely put the amplifier on standby, remove it from its socket and turn it back on. Eschewing semiconductors in the amplification chain, this pure tube design is based off the venerable 6c45 triode in a classa, singleended topology with handmade nickel alloy core transformer coupled outputs. A triode is teamed with a diode, a triode with different characteristics, a tetrode, or a pentode, are listed in other tables. Later, ge and philips produced straight bottle 6550s.
Everything you ever wanted to know about output tubes. The amps loud enough to play in a basement situation with bass and drums, id guess the princeton output transformer puts out a lot more power than the champ one. View similar products to the peavey super 6 6l6 gc str387 power tubes 2 per in the vacuum tubes product category. Driverinput tubes i need somebody to either explain or steer me to an explanation of the 12ax712at7 tube s purpose in my jolida jd502p power amp. It uses two 6c45 driver tubes, and two of the previouslymentioned. Plate voltage 150 heatercathode voltage 100 cathode. I did see some tubes glowing, and some that flat didnt work. More electron tubes can be found in the tube store collection of new old stock nos if you are looking for a tube shop carrying the very best tubes for your amplifier, youve come to the right place. Its a classic stereo tube amplifier design with a twist. From the 1st moment i saw the specs ive recognized this will be the new millennium tube. I did notice that once of the power tubes blue glow appears to be slightly brighter than the other.
The tubes only get moderately warm in the panam i could still touch them after it had been on an hour with the gateway. The power tubes should be all but quiet when they are tapped. The 6s45pe is a highdurable, longlife triode vacuum tube used as a wideband power amplifier. Best single ended stereo tube amplifier, glow audio amp one. Fiftywatt amplifiers typically use a pair of power tubes, while 100watt designs will use two pairs. Added benefits of the tube are that it is very quiet.
The 6c45 triode acts as both driver and power tube. It is a pure tube design, utilizing 6c45 tubes in a classa, singleended topology, with transformer coupled outputs. This auction is for one matched pair 2 tubes of the high quality novosibirsk 6h6pi power tubes compatible with the little dot mk ii and mk iii amps. I get sound when i plug in, but its a consistent overdrive, i assume this is because only one tube is functioning correctly, there for half the wattage, half the head room. I welcome contributions, criticisms and corrections. The ge 6v6 wasnt glowing at the plate or anything but that just seems like too much. The ec8020 has an exceptional linearity, high dissipation and trasconduttanza worthy of a power triode. Wa33 employs a true fullybalanced design featuring 6c45 driver tubes, four 2a3 power tubes, and 274b rectifier tube, all in directheated triodes to reveal the. Can be used in place of 6550 for a more round bass signature.
Premium gold pin version of sovtek 6c45pi super triode. Evatco ranges everything you need to build or repair valve amplifiers. Get your questions answered from other customers who own this product or have experience with it. The amp with its volume set to 10 is as loud as it might be normally at 1 but very distorted and breaks up. Well, the other day i just so happened to notice one of the two 6l6s was not glowing, nor was it hot. In a speaker amp this is almost always a fairly high power tube. Tubes listed on this page contain a single triode in a single envelope. This is an amplifier cu, a final integrated compact which employs a single tube triode signed 6c45pi.
But a plate glowing red is from too much current flowing thru the tube is very bad. This document is intended to address the frequently asked questions reguarding the blue glow frequently seen in power electron tubes or valves. This tube has a very high transconductance for exceptional. Amp powers on, but the volume is very low and distorted on both clean and overdrive channels. Were made for military equipment at reflector plant. Not fully warmed up, dac in play had to load the driver on the pc there, and 12 o. Sovtek says that one would have to parallel 15 dual 12ax7type tubes thats 30 sections to get the noise voltage down to one single 6c45. Further, the equivalent noise resistance is 50ohm, making it well suited for a broad range of applications. The novosibirsk 6h6pi tubes we stock are the highest quality 6h6pi we have found and is a great power tube upgrade for the little dot. This lightweight onboard glow driver unit is ideal for model aircraft, helicopters and cars alike and features an led onoff switch and a voltage regulator all in one. The 6c45pe is a low power triode 8 watts max for the p d paramenter. There are no semiconductors used in the entire signal path.
Wa33 fullybalanced headphone amppreamplifier woo audio. 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. The kwr37 link was to show that tubes were also used as complex digital switching components in equipment well past their prime when there was a special requirement. This is more accelerated on output power tubes like 6l6. In the heyday of the old boozhound labs blog, when i was building a ton of audio gear and was super into tubes, an amp using this basic topology transformer coupled pushpull 6c45s was the last and best tube amp i built. Following the introduction in july 1936 of the 6l6, the potential of the. Vacuum tube 6ca7, electroharmonix antique electronic.
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