Manufactuer "LaoChen" have 3 brands name: "Oldchen" , "LaoChen", "Aiqin"  So for this product, we have some amplifier  maybe  come with "Oldchen" words on the front plate,and others come with "LaoChen",please pay attention. Basic technical parameters: Tubes:  1 x Shuguang 5Z3PA rectifier          2 x Shuguang 6N8P(6sn7) preamp tubes         2 x PSVANE KT88  power tubes(KT88 tubes garentie 6 months) Power transformer...

if you needs the default tubes can replace with 2x PSVANE CV181 TII preamp tube,  and 1x PSVANE 274B: but nees plus price, you can contact us Parameters: Pre-amp tubes: 2 x 6SN7/6N8P/6H8C/CV181(depend option) Rectifier tube: 1 x 5U4G/5Z3P/274B (depend option) Power tubes: 2 x PSVANE made "special customize for Laochen 300B-SE" power tube  Output power : 8Wx2,   Power transformer Power: 150W Frequency response: 15Hz-35KHz Output Impedance: 4 ohm, 8 ohm Total Harmonic...

If your speakers and audio source are very good, you have a higher level of pursuit for the sound quality of the machine and the sound level of the tube. You can upgrade the PSVANE tube 6SN7-SE*2, 300B-SEN*2, 845SEC*2. Standard version：845*2+6SN7*2+300B-SE*2 Upgrade version：PSVANE 845-SEC*2+PSVANE 6SN7-SE*2+PSVANE 300B-SEN*2         Parameters: Preamp tubes: 2 x Special customize 6SN7(grey plate) or 6SN7-SE (Gold pins, black plate) Driver tube:  2x Special...