madswitcher
Well-known member
Hi All,
I have a couple of Siemens V78 on the bench that are in the original spec and have not, as far as I can see, been modified in any way. They seem to work fine in giving the 40 dB to 70db gain, but the frequency response has a couple of nasty peaks: one at about 5Hz of 5-6dB and another at about 39kHz of about 9 dB. Otherwise they are flat 20Hz to 20kHz
Are these peaks normal for these beasties?
If not what could be the cause and how do I fix them?
Are they of concern, being outside of the audio spectrum?
I have also read that V78s can be converted to V72s. Is this worth it and who might be able to do it.
Thanks for any advice
Mike
I have a couple of Siemens V78 on the bench that are in the original spec and have not, as far as I can see, been modified in any way. They seem to work fine in giving the 40 dB to 70db gain, but the frequency response has a couple of nasty peaks: one at about 5Hz of 5-6dB and another at about 39kHz of about 9 dB. Otherwise they are flat 20Hz to 20kHz
Are these peaks normal for these beasties?
If not what could be the cause and how do I fix them?
Are they of concern, being outside of the audio spectrum?
I have also read that V78s can be converted to V72s. Is this worth it and who might be able to do it.
Thanks for any advice
Mike