Basically I’m not interested in using tubes for movie sound, my opinion modern movie sound have digital base, and they are fast which require speed circuits. Solid state amps are best for such sound than tubes. Besides that for a 5.1 system 6 OPTs, and 6 individual channels needed. Hard to find tube based low pass filter circuit. Lot of money and more complex.....so i avoided.
But I like cinema scope movies (Hollywood) and have noticed the difference in sound quality of those movies which is more live. Recently I got chance to meet a technician who is in cine-field for a long period. He gave lot of information about cinema scope sound and DTS. He explained how both are very close in technical aspect and differs in quality. He asked me to try tube amps for old movies. After that meeting I plan to built a fully tube based 2.1 amp. After searching a lot I found 2 circuits first is 5W+5W+8W output and second is 14W+14w+18W amp, both circuits are RCA amplifier circuits. 3 channel amp, 2 for right and left channel 1 for woofer (have tube based low pass filter no solid states)
I decided to build the first model
Tubes used: 6FQ7-2, EL84 -3, GZ34-1
But I like cinema scope movies (Hollywood) and have noticed the difference in sound quality of those movies which is more live. Recently I got chance to meet a technician who is in cine-field for a long period. He gave lot of information about cinema scope sound and DTS. He explained how both are very close in technical aspect and differs in quality. He asked me to try tube amps for old movies. After that meeting I plan to built a fully tube based 2.1 amp. After searching a lot I found 2 circuits first is 5W+5W+8W output and second is 14W+14w+18W amp, both circuits are RCA amplifier circuits. 3 channel amp, 2 for right and left channel 1 for woofer (have tube based low pass filter no solid states)
I decided to build the first model
Tubes used: 6FQ7-2, EL84 -3, GZ34-1