Salossi
Well-known member
I finally finished my G7, and from the first moment I powered it everything looks quite good. The sound is absolutely fine, no hum at all (in contrast to the other mic I built) and the noise is very low. Now I have to build a shock mount and do some mod´s on the rubber absorber the capsule is mounted on (it is too soft, the capsule is dithering a lot if the mic is moved).
There are 3 problems left, i have to solve:
- The main problem: The mic sounds very fat and good in both positions, cardioid and fig8. But when switched to omni-position, it sounds like a lo-cut being switched on, very thin. Almost no bass response in omni. First I wondered, if the backside of my capsule is bad, but then the sound of fig8 would also be affected, right??
- the phase is reversed, compared to all my other other mic´s. Of course this is not a big deal, but perhaps the layout of the Gyraf G7 is wrong? I wired the LL1538 like it´s mentioned in the G7-schematic. And I have a K67 capsule with a common backplate and separate terminals for both diaphragms (should be the same with the CK12). Has anybody already checked the phase of his G7??
- My plate-voltage is a little bit low... it measures only about 130V instead of 160V, so perhaps I´ll change one of the transformers and regulate the voltage. One of the reasons is my low mains voltage (only about 215 V instead of 230V). But I think it´s better to control this voltage. Anyway: the mic also runs on 130V, but probably with a lower output.
So, if you have any idea about my omny-sound-problem, please let me know!
And I will soon post some new photos of this mic...
Greets,
Sascha
There are 3 problems left, i have to solve:
- The main problem: The mic sounds very fat and good in both positions, cardioid and fig8. But when switched to omni-position, it sounds like a lo-cut being switched on, very thin. Almost no bass response in omni. First I wondered, if the backside of my capsule is bad, but then the sound of fig8 would also be affected, right??
- the phase is reversed, compared to all my other other mic´s. Of course this is not a big deal, but perhaps the layout of the Gyraf G7 is wrong? I wired the LL1538 like it´s mentioned in the G7-schematic. And I have a K67 capsule with a common backplate and separate terminals for both diaphragms (should be the same with the CK12). Has anybody already checked the phase of his G7??
- My plate-voltage is a little bit low... it measures only about 130V instead of 160V, so perhaps I´ll change one of the transformers and regulate the voltage. One of the reasons is my low mains voltage (only about 215 V instead of 230V). But I think it´s better to control this voltage. Anyway: the mic also runs on 130V, but probably with a lower output.
So, if you have any idea about my omny-sound-problem, please let me know!
And I will soon post some new photos of this mic...
Greets,
Sascha