radio28 said:I am surprise that 12ax7, 12at7 and 12au7 can be swapped freely and no need to change the related RC components value
I know KT88 and 6550 is about the same, but can I swap the kt88s to el34s?
Since it sounds like that this amp doesn't have enough gain, is it better if I add a pre-amp (say marantz 7 circuit) between CD player and this amp?
radio28 said:Is that the kt88s in the schematic connected in UL mode now? That switch is used to change the kt88 in triode/UL operation, right?
huymdt said:Please help me
I bought an amplifier it the same above and I have a problem!
It has two way signals input (convert to 1.volume or 2.direct). With signals direct (used volume from CD) it's ok, but signals input through the 1. error... The volume transmit signals minimum at level 1/16 and get the maximum at level 1/15 (it seem not boundary between min and max).
I used the 6Pi3C-E tube instead of KT88. The voltage pinout:
- The anode (pin 3) = 390 VDC
- The g2 (pin 4) = 390 VDC
- The g (pin 5) = -26 VDC
- The ht (pin 2 & 7) = 5,8 VAC
- The cathode (pin 8) = 0,9 VDC
Is it good with my amplifier?