Seabstudio
Active member
- Joined
- Jul 6, 2012
- Messages
- 36
Hi everyone !
I search a advice about a good tube line driver . I already build a good spring reverb but i have difficulty with this last stage .The driver stage for spring is good and drive hard the springs ( I hear them rattle often ) With a lighbulb 150mA I can see the filament get red on certain source , so that part of circuity work fine
My soundcraft serie 600 ( desk from mid 80's ) have 10K input. After recovery reverb stage on the reverb, I try Gyraf SRPP with 12AU7 and transformer 2:1 ...i need to push hard my line input on mixing desk , maybe more than 3/4 , it s not normal . IF I change secondary wiring on 2:1 transformer and use the two 150ohms winding in parallele instead of serie , the gain goes up but sound change a lot ( more "harsh", less warm and react strange on bass ) , I try ECC88 , it s little more gain , no big difference
Because I m motivated I try a LA2A stage with 12BH7 and Carnill 15K:600 ....same problem, it s very low level too ( but sound really good )
I don t know if it s the impedance mismatch / 600ohms things , and that my question too .
Do you recommend a specific line out circuit to match my "modern " mixing desk with 10K input instead of old 600ohms matched impedance.
Any helps greatly appreciated
Thanks in advance Seb
Sorry for my english
I search a advice about a good tube line driver . I already build a good spring reverb but i have difficulty with this last stage .The driver stage for spring is good and drive hard the springs ( I hear them rattle often ) With a lighbulb 150mA I can see the filament get red on certain source , so that part of circuity work fine
My soundcraft serie 600 ( desk from mid 80's ) have 10K input. After recovery reverb stage on the reverb, I try Gyraf SRPP with 12AU7 and transformer 2:1 ...i need to push hard my line input on mixing desk , maybe more than 3/4 , it s not normal . IF I change secondary wiring on 2:1 transformer and use the two 150ohms winding in parallele instead of serie , the gain goes up but sound change a lot ( more "harsh", less warm and react strange on bass ) , I try ECC88 , it s little more gain , no big difference
Because I m motivated I try a LA2A stage with 12BH7 and Carnill 15K:600 ....same problem, it s very low level too ( but sound really good )
I don t know if it s the impedance mismatch / 600ohms things , and that my question too .
Do you recommend a specific line out circuit to match my "modern " mixing desk with 10K input instead of old 600ohms matched impedance.
Any helps greatly appreciated
Thanks in advance Seb
Sorry for my english