1.300Bseries with 300B,300B-98,300BA,300BAW,300BS
2.KT88 series
Brief introduction; kt88 series include KT88, GEKT88,
KT88-98, KT100, CV5220 and 6550-98, this kind of tube belongs to
Side-heating cathode four-level beam tube, mainly used in machines that have greater audio power,
push-pull output. Inthis series of tube, the
Board consumptions relatively lower are KT88, GEKT88, with 40w
Power, while the board consumption of KT88-98, KT100, CV5220
And 6550-98 reaches 45w, which is very suitable for the ultra-linear
Gallbladder circuit . it can bear pressure, with its strong power
Excellent packed sense, wide audio frequency. Adopted no-noise and anti-vibration designing art, it is one of the main products in shuguang electron group company. The annual sale of this kind of product is 80-100
Thousand sets. Winning deep support and favor from customers, it has a good reputation of¡¯charming pirince¡±.
(After june, 2003, the shuguang electron group co. ltd will further
improve the tube base of KT88.)
3.EL34 series
Shuguang has EL34A and EL34-B two tube kinds of this series. EL34A is pentode with the G1 and G2 not in complete contraposition but the latter is quatrode with G1 and G2 in complete contraposition.
This series tubes are usually used in the mid power amplifiers and ultra-linearity circuit. Compared to KT88 this series has sweeter and more exquisite sound. The anode dissipation power of EL34A is 25W; the EL34-B is 30W.
4. 6L6 series such as 5881, 5881A, 6L6WGB, 6L6GC, 6L6GCR etc.
This tube series are mainly used in mid power amplifier and guitar amplifier. Among this series the tube 5881A is the best. Its anode dissipation power is 5W higher that the other tubes¡¯. And all electrodes are fixed in powerful way for the excellent aseismatic character. Its considerate design of inner spacer structure is effectual measure to assure the less than 4¦ÌV output noise. The graceful and decent looking makes it popular for the American and Europe market. And the other tube types are also guaranteed in quality.
5.813
Thorium tungsten anode and graphite cathode, straight heating beam quatrode electron tube 813 is used oscillating in radio equipment with the frequency as high as 30MC. While the tube is used to power amplifying (such as AB series) the output power could reach 300W or higher.The tube 813 has dependable performance and excellent linearity to express not only thunder and tiger roar but also the delicate tweedle. And it¡¯s the favorite of some audio fans.
6.845B
The hydride graphite anode and Toshiba specially-made thorium tungsten cathode vacuum tube 845B is with more than 100W anode dissipation power. The cathode material with very strong electron emitting capacity helps to avoid distortion while a strong signal inputting. The designer removes the top mica of our original 845 to avoid the leakage. And the distance between anode and grid leading wires being increased to 35mm improves the insulation greatly and at the same time reduces the medium loss of stem glass to resolve the problem of stem blown and air leak from stem. Furthermore, the inner porcelain parts of 845B with many grooves switches off the leakage circuit to ensure the complete signal inputted into grid. The new designed tubes 845B is evacuated supreme to get the long lifespan and stable performance. Anymore this tube is based by pure copper base which is beautiful and has very good shelter to outside electricity field. To sum up, the vacuum tube 845B has excellent performance both in stability and sound.
845C
This tube is as good as 845B in many aspects except the 845C is made of metal mesh plate. The different anode materials of Shuguang made high carbon annoy is a key point to have sweet and warm sound and tone. An additional point is that the 845C has the output power not lower than 845B.
7.2A3B
It¡¯s a newly-designed and made audio triode with high carbon annoy plate and new spring hook heater and 5W output power than the current Shuguang twin anode 2A3.It has more exquisite sound and bigger power than current twin plate 2A3. This tube is assembled with high transparency glass and porcelain base with gold pins, which makes tube look slim and noble. No doubt, this new tube is a good choice for tube amplifiers fans.
2A3C
With the same slim stem of 2A3B and double mica, to be assembled with high transparency glass and new style spring heater, and the super vacuum, the 2A3C tube is stable and credible. It looks like 300B but with some different and favorable details. For examples, the double mica reduces the microphonics; the glass based with gold base makes it noble and generous. But the most favorable is the particular performance while playing music.
2A3S-B, 2A3S-C
The both tubes are single mesh plate triode. The former is made of hydride pure nickel plate while the latter is carbonized pure nickel plate. The mesh structure of plate make the lighting heater visible while working, and at the same time these tubes have very excellent sound performance, which makes the listeners enjoy these tubes both in seeing and listening.
8.274B
This tube is a high performance rectifier tube. Adapting to the new electrophoresis, the finish of cathode is very smooth, which ensures the enough emitting current. With supreme evacuator vacuuming for long time, the inner tube vacuum is 100 times higher than our current 5U4G. The stability is improved by long time high voltage burn-in. This tube can accept 850V peak voltage reverse with outputting current DC 150mA. This tube shall not spark while high voltage working. In a word this 274B is a very good rectifier tube for amplifiers use.
9.12AX7, 12AU7, 12AT7
a.12AX7 is 9 pin, low noise, high ¦Ì, flat stem vacuum tube to be used as voltage amplifying in audio circuit. It usually is used as push-pull driven circuit. Shuguang 12AX7 is divided into 12AX7A and 12AX7, among which the former is tested through microphonics, hum and noises. For different customers have different usage, we prefer that the buyer should tell us the Ia of heater. This tube also can be used as first stage amplifying tube in high gain amplifiers. 12AX7 has the identical parameters and performance of ECC83.
b.12AU7 is 9 pin, mid ¦Ì, flat stem twin triode used in amplifiers as push-pull amplifying. It is similar to ECC82 and 6189 which can be replaced with each other.
c.12AT7 is 9 pin, low noise, high ¦Ì, flat stem twin triode used in amplifiers as push-pull and voltage amplifying. It is similar to ECC81, 6201 and GT12AT7 which can be replaced with each other.
Now we are trying to develop some new tubes included with 7025, 12AS7 etc. and some high power emitting vacuum tubes such as 3-500C and 4PR1000. |
