Potato Cakes
Well-known member
Hello, all,
I'm wrapping up an 251 build and after correcting some wiring mistakes, I have very low output, although it is clean and full range (not one-legged). I injected signal into the transformer where it connects to the output capacitor and I getting proper signal (I believe) out the audio + and - pins on the connector. I've tried swapping capsules and I got the same result. Then only thing I can think of now is the tube might be the issue, even though it's new. I'm using an Electro Harmonix 12AY7 and I do not know if there is a quality history with these that I should be made aware. I also don't know if it's possible that a tube could be putting out low signal and not have it be distorted and thin sounding. I've built this particular mic before with the same layout but with a NOS 6072A, so I at least know the layout I am using will work. Does anybody here have some information regarding the EH 12AY7 that I should know about?
Thanks!
Paul
I'm wrapping up an 251 build and after correcting some wiring mistakes, I have very low output, although it is clean and full range (not one-legged). I injected signal into the transformer where it connects to the output capacitor and I getting proper signal (I believe) out the audio + and - pins on the connector. I've tried swapping capsules and I got the same result. Then only thing I can think of now is the tube might be the issue, even though it's new. I'm using an Electro Harmonix 12AY7 and I do not know if there is a quality history with these that I should be made aware. I also don't know if it's possible that a tube could be putting out low signal and not have it be distorted and thin sounding. I've built this particular mic before with the same layout but with a NOS 6072A, so I at least know the layout I am using will work. Does anybody here have some information regarding the EH 12AY7 that I should know about?
Thanks!
Paul