Were made for military equipment at reflector plant. 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. Whether youre shopping for a new amp or trying to coax different tones from one youve got, this comprehensive look at power tubes and their sonic traits is essential reading. Hybrid amplifier by andrea ciuffoli audio design guide. Introduced in 1949 by philips, the el34 is a high power pentode power tube commonly found in guitar amplifiers of european design. Plate voltage 150 heatercathode voltage 100 cathode. To use the 6c45 it is necessary limit the power supply voltage of the driver reducing the relative secondary of the transformer because this tube have a. There are no semiconductors used in the entire amplification path. To use the 6c45 it is necessary limit the power supply voltage of the driver. Beauty meets highperformance, wa7 is a vacuum tube headphone amplifier. Many of these tubes have a plate resistance about 2kohm but only the d3a and 6c45 have an amplification factor greater than 50. Diy otl power amp just showing some vocalsautobias futterman circuit. There are no semiconductors used in the entire signal path. Installation is pretty clear, just make sure the guide key is lined up correctly and do make sure your amp is turned off for a day or so before changing tubes as the capacitors can hold a high charge and fry you if you are not careful.
Okay, lets get back to topic about overdriving the 6c45. This amazing tube will excel in small signal applications, as well as a driver, or anywhere really precise performance is required. It uses four 2a3 power tubes, four 6c45 driver tubes, and 1 5u4g rectifier tube. Everything you ever wanted to know about output tubes. The chief engineer, wei wu has been designing tube amplifiers for over forty years. A pair of 6c45 triode tubes acts as both driver and power in a singleended classa design with transformer coupled outputs.
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 headphone amps particularly those that came stock with. Anyway, 6l6 is an american 30 watt tube, so you can multiply the number of tubes and get the power, two tubes 60 watts, four tubes 120 watts, the manufactures number is just a number, they usually post something that is easy for them to get or will sell the amp, how loud. More electron tubes can be found in the tube store collection of new old stock nos. Hes been building pcs and ruffling feathers in the industry for 20 years, and isnt afraid to. The next time you need to retube your guitar, bass, or hifi amp, be sure to insist on getting authentic electroharmonix tubes. View and download woo audio wa7 fireflies owners manual online. Ecc99 is a capable and popular mediummu 5w twin triode, which is reported to be very linear, quick estimates shows that a 2stage ecc996c33c amp needs over 10vpp of input signal and therefore the amp with ecc99 as a driver must have at least 3 stages. Tuan is the editorinchief of maximum pc, and loves all things tech. Still, theres a lot going on in the wa7, and a lot of power coming out of it. Apr 27, 2016 tuan is the editorinchief of maximum pc, and loves all things tech. 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.
The 6c45p 6s45p in the western alphabet is a high mu triode with a very high transconductance, incredible linearity, very low noise, and low plate resistance. The el34 delivers a very different sound than the 6l6 because the el34 is a pentode and the 6l6 is a beam tetrode. Before i sent it in i took out the power tubes and saved them. 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.
It employs a pure tube design, utilizing 6c45 tubes in a classa, singleended topology, with transformer coupled outputs. Each wound string is precision wrapped with round nickelplated steel onto a high carbon, hexagonshaped steel core. I recently had a blackface fender bassman amp restored and was wondering about which 6l6 tube would give me the best tone. When power tubes wear out, the low end starts to fade, and your amp will sound flat. I need to get some backups for my orange rockerverb 50 and wasnt sure who has the best tubes currently. From the 1st moment i saw the specs ive recognized this will. The small cube enclosure has a separate power supply which can be placed on the floor. The three in line on the right side of each channel should be voltage amplifier in front then a pair of outputpower. Anyways, orest wanted a design that uses ecc99 as a driver. Everything you ever wanted to know about preamp tubes. Kindly inform me the availability of out put transformer and the main power transformer for this project. A guide to power tubes and their signature sounds premier guitar. These are great replacement power tubes for many guitar amps.
These are highly recommended for dumble type circuits tworock amplifiers, bludotone, glaswerks and any other guitar amplifier. Output power or drive strength is lesser than the 6c45 ec8020, but the good thing is it is still available. My current preferred setup is with vintage rca jan2a3 black plates bought from ebay, electroharmonix gold pin 6c45 tubes bought from woo, and a usaf 596 rectifier tube ebay with a. Solid power and strong bass drive even with hard to drive headphones. Woo audio wa7 fireflies owners manual pdf download. Jul 29, 2002 this is what i found about the 6c45 used in my r10h. This is what i found about the 6c45 used in my r10h. I asked them to give me a new set and bias when the did the conversion. Power tubes or more accurately termed output tubes are what provide the big sound. The 6c45 triode acts as both driver and power tube.
Wa33 fullybalanced headphone amppreamplifier woo audio. Jan 15, 2009 although some people refer to them as power tubes, i feel output is far more fitting. The best one is the one that sounds the best in your amp your circuit and your system, to you. Is anyone able to confirm this compatibility of these two tubes. This amplifier born to create a reference in the hybrids using the best design and no compromise components. The new 6c45 sovtek tube the best discover ive recently made is the new 6c45 tube. The 6c45pe is a low power triode 8 watts max for the p d paramenter. This is more accelerated on output power tubes like 6l6.
The s mag wrote that they were able to just swap a 6c45 out of the c3g socket, and then insert a c3g tube. This is a list of vacuum tubes or thermionic valves, and lowpressure gasfilled tubes. 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. The unique voltage amplifier stage drives without problems the 211s grid pemitting also a soft a2class mode of operation. Mar 20, 2009 6c45 class a single ended stereo power amplifier. The company is located in new york and it is a familyrun business.
With the two 6c45 driverpower tubes, the wa7s classa, singleended tube amp outputs up to one full watt at 32. Jul 02, 2014 the power supply is in a simple black chassis, and comes with enough cable to hide it away. Only do this if you need more output power and more drive strength from this tube, as power stage or driver stage. My current preferred setup is with vintage rca jan2a3 black plates bought from ebay, electroharmonix gold pin 6c45 tubes bought from woo, and a usaf 596 rectifier tube ebay with a woo audio custom 596 5u4g adapter. The plain strings are made from the same high carbon steel as the hex cores.
But i will say that in the output driver section of my cj mv55 power amp, i have tried various old american 6sn7s taken from my guitar amps,plus some originally storebranded nos ones probably of rca manufacture that i ordered from atsi. The following guidelines should be taken into account. Pure tube design without the use of semiconductors in the amplification circuitry. Recorded on a mobile phone so the bass dosent record wellthe bear is not minelol. Dec 16, 2011 diy otl power amp just showing some vocalsautobias futterman circuit. Wa7 fireflies 2nd gen headphone amplifier dac woo audio.
The 6c45 pe is a low power triode 8 watts max for the p d paramenter. 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. In preamp design and other lighter load applications, this is not really necessary. I understand that they control the power section of an amp in some way, but i suppose im just not clear on the mechanism through which they accomplish this. Charlie haden pat metheny beyond the missouri sky 180 gram vinyl lp firsttime 180gram vinyl out of print. Single ended ecc99 6c33c amplifier with regulated tube ps. Our thoughts go out to all who are affected by covid19. Any solid state amplifier is composed by two sections. Although the electronic values of both of the tubes are almost identical, they hardly sound the same. Highquality russian 6s45pe 6c45pe tube, equivalent to the we437. Short lifetime for 6ns7 tubes audiogon discussion forum. Interesting i had a marshall studio 15 which used 6v6 tubes, always thought they were el84 tubes till after i had sold it.
There is no best tube, in general, considering these criterium, as each tube will perform differently under these different conditions and also according to your own personal taste. If you arent sure about which valve you need, or what tubes you can substitute, let us help you. The tubes supplied by the manufacturer had no markings. It is a pure tube design, utilizing 6c45 tubes in a classa, singleended topology, with transformer coupled outputs. Rare philips ecg sylvania made 7581a power output tubes. A bit off the usual topic of conversation, but there are a lot of tube experts floating around these parts. The plate did not grow red and the tube operation remains stable. Did you know that electroharmonix makes many of the worlds greatest vacuum tubes. The 6s45pe is a highdurable, longlife triode vacuum tube used as a wideband power amplifier. Discussion in amps and cabs bg started by paganjack, nov 19, 2008. Wa7d fireflies retains the same highperformance ti pcm5102a dac chip and amplifier section as the wa7. Replacing with fresh power tubes on a regular interval is a good, easy way to keep your amp and tone in top shape. Hes been building pcs and ruffling feathers in the industry for 20 years, and isnt afraid to call out bad products and services. As you use your tube amp, tubes wear out due to the heat it generates.
The woo audio wa7 fireflies ampdac is a combination of high performance vacuum tube headphone amplifier with a builtin usb digitaltoanalog converter. These are the biggest tubes in an amp that pump out serious wattage. The free shipping option allows tubedepot to choose the most appropriate carrier and service. My current preferred setup is with vintage rca jan2a3 black plates bought. Triode for hf amplifying in wide frequency amplifiers. When you start looking for every last watt out of a power tube it helps if the tube before it can supply a bit of power you kind of smack them around a bit despite peoples love for fairly large power tubes in headphone amps, headphone amps almost never get to this level. The power supply is in a simple black chassis, and comes with enough cable to hide it away. Highquality russian audiophile tube 6s33sv 633 in russian. All the hybrid amplifier use as voltage amplifier vacuum tubes and transistor or. Woo audio has a reputation of producing very high quality tube amplifiers built in the united states. Our new ehx strings electroharmonix electric guitar strings are customdesigned to our specifications and made in the usa by a premiere string manufacturer. You can also learn more about vacuum tubes and tube amplifiers. The woo audio wa7 gen 2 fireflies ampdac is a combination of high performance vacuum tube headphone amplifier with a builtin usb digitaltoanalog converter.
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