American Elvis SL-1 preamp, simplified version of 6N1+6N2+6N11 bladder preamp circuit board, board code ------- JCDQ26P
The JCDQ26P pre-stage circuit is imitated the classic American vacuum tube pre-stage CAT SL-1 Signature.
The attraction of CAT SL-1 is that it can maintain the beautiful and rich sound quality of the vacuum tube, while providing the unique control and low frequency of the crystal machine. The leading American audio magazine STEREOPHILE selected CAT SL-1 as the equipment of the year in 1993. You can imagine its power.
Three different types of vacuum tubes are used on the CAT line, and a total of 4 double triodes are used. The first stage uses 12AU7, whichever is higher frequency bandwidth, sweet tone. The second stage is even more brilliant, using the high-amplification tube 12AX7 for SRPP, creating an extremely wide bandwidth and invincible dynamics for the entire line. Finally, 6DJ8 is used for output to obtain very low output impedance and driving force, which can be used with various post-stages without matching problems.
The JCDQ26P PCB board is as shown below
The schematic diagram is as follows, which is different from the power supply part of the PCB board.
These three bile ducts, 6N1, 6N2, and 6N11, are dedicated audio tubes. No one knows about tube amplifiers. They are widely used in audio amplifiers and are the evergreen trees in electronic tubes. They have been used in the tube amplifier industry until now.
The newly imported 12AU7, 12AX7, and 6DJ8 tubes are expensive, and six will cost more than one thousand yuan. Using domestically produced 6N1, 6N2 and 6N11 to replace imported electronic tubes has another effect.
6N1 and 6N11 are medium μ tubes, and 6N2 are high μ tubes. The gain/screen flow is different, such as the difference between 12AU7 and 12AX7, or the difference between 6N8P and 6N9P.
6N1, 6N11 and 6N2 exist in large quantities, are cheap, and are cheap and good-quality sound tubes. Using it to make the Elvis circuit, its voice is completely reborn, just like Sister Feng changed or Fan Bingbing.
6Z4 tube and transistor mixed rectification, 6P1 tube voltage regulator, 6N1 tube sample voltage regulator circuit, dual mono symmetrical design. Replace the 12AU7 tube of the original circuit with 6N1 tube, replace 12AX7 tube with 6N2 tube, replace 6DJ8 tube with 6N11 tube, DC 260V high voltage stabilized power supply, 10 tubes AC power supply.
Exquisite FR4 double-sided glass fiber board, high-quality PCB board, 2mm thick board is not easy to deform. Thick copper foil has strong overcurrent capability. Board size: 213×205mm.
Due to the wiring of the circuit board and the winding of the transformer and the filament power supply, some technical measures have been taken. Although all the AC filaments are powered, the hum is weak and the ears are close to the speaker cone. Only when the ears are close to the speaker cone, the slight hum is heard, which does not affect the use.
All 10 electronic tube filaments are supplied with AC power. Looking at other Taobao merchants, it seems that they have not done this because the communication sound cannot be resolved.
The AC power supply of the tube amplifier filament is different from the DC power supply, and the AC power supply of the filament is more bile.
The 6.3V filament voltage changes from 0V to 6.3V in 1 second, and then from 6.3V to 0V, and changes 50 times. The changes in timbre brought by the ears are easy to hear. The principle of good sound is the same as playing erhu or violin. The vibrato effect produced by finger rubbing is similar.
The left and right channels are high-voltage independent and regulated. The transformer is powered by six groups of independent filaments. Brands such as Siemens Germany, Italy "Kendeil" Kendall have a fever, electrolysis, Japanese chemical industry, Ruby, West German Weimacapacitors, West German EPCOS capacitors, Sweden RIFA capacitors and other brands form a powerful power supply, amplifying circuit, and the metal film resistance has more than wattage. the amount. DINKLE Fujitec high-quality terminal, high-quality gold-plated silver ceramic socket.
The JCDQ26P finished board is equipped with electronic tubes and 10 domestic electronic tubes. Two 6Z4, two 6P1, three 6N1, two 6N2, and one 6N11.
The JCDQ26P finished board does not include a tube. If you want to buy an empty PCB board, please contact the seller, thank you very much! !
Board code: JCDQ-26P The finished board weighs about 0.8KG
Friendly reminder: Some of the resistance and capacitance components on the circuit board are second-hand products. The components on the finished board are different due to different assembly batches. Some components use brand models and specifications. The parameters of the components on the board shall prevail. !
If you need to buy a matching power transformer, please contact the seller, thank you very much! !
The matched vacuum tube machine uses 105W power transformer, 300V double high voltage, six groups of 6.3V filament voltage, EI86X45 specification, transformer code name JCDQ26L
105W high-quality multi-purpose power transformer: It can be used in Hetian Maodan pre-stage line, and the double high-voltage feast is suitable for most of the rectifiers.
EI 86X45 core, Z11 core, fixed by British Red Bull clip, transformer core size: 88mmX75mmX75mm.
Input AC 0-220V-235V primary and secondary shielding end
Output high voltage: 300V 80mA, 800V 80mA, two groups of four lines
Output filament: 6.3V 1.5A, 6.3V 1.5A, 6.3V 1.5A, 6.3V 1.5A, 3.15V～0～3.15V 1.5A, 3.15V～0～3.15V 1.5A
It weighs about 2.23kg/piece.
