I could be imagining this be I seem to recall reading about a few mic preamps that started sounding distorted, with high and low frequency roll off, kind of like AM radio or a telephone? Has this happened to anyone? What caused/cured it? If there was a discussion on this please point me in the right direction.
Mic Preamp suddenly sounds like AM radio / telephone??
- Thread starter Ethan
- Start date
Help Support GroupDIY Audio Forum:
gang of elk
Well-known member
is it a transformer output going into an unbalanced connection?
dale116dot7
Well-known member
That can be the result of an RF oscillation - possibly in the power supply or the preamp itself. If you have a 'scope, check for a signal somewhere between 100 kHz and 20 MHz. I had a PA board do that on me. A capacitor on one of the 15 volt voltage regulators dried up and the regulator started to oscillate. If it's the power supply, check the output capacitors. If it's the op-amp, try putting a 0.001uF cap from the output to the - input and see if it goes away. The op-amp can also oscillate if it's driving a reactive (typically capacitive) load.
when was the last time it had its caps done? i'm not personaly familiar with this pre but i've seen it on others. are you still getting a strong signal? if not, could one side of the signal be disconnected? like only the + and ground are connected somewhere? not the -
Hang up.
rafafredd
Well-known member
$5000 at Ebay! :green:
Kev
Well-known member
[quote author="tk@halmi"]Hang up.[/quote]
:green: :green: :green:
sorry
that made me laugh !!
:green: :green: :green:
sorry
that made me laugh !!
G
Guest
Guest
[quote author="WJS"]or, if you dont like AM, go FM, i've heard they have something new called stereo[/quote]
AM have also stereo,
and just two receivers you need to decode it...
{and it is not two transmitters, just one, with phase modulated carrier}
xvlk
AM have also stereo,
and just two receivers you need to decode it...
{and it is not two transmitters, just one, with phase modulated carrier}
xvlk
SSLtech
Well-known member
well, we seem to have gotten away from any answers that are actually helpful, everyone seems to be having fun without actually addressing the question, so -to get things back on track:... ... ...
The real problem is when your bass license expires. If you don't stay on top of that and keep it up to date, you'll find that one day you have no more low frequencies. -Similar things can happen if your HF permit is out of date.
-Sounds to me like a few people have let them lapse... don't forget that if you buy them at the same time, they'll both naturally expire at the same time, so that's why things get all mid-rangey all of a sudden.
I recently lost my mixing license. -I got clocked doing 135BPM in a chorus that should have been no faster than 65... They didn't even give me any points, they just tore up my license! -I wanted to try and cop a plea, see if I could get off with a 16-bit/44.1 limitation for a while, but the judge (Judge Producer... known as a bad-tempered old git!) was having none of it.
:sad:
Keef
The real problem is when your bass license expires. If you don't stay on top of that and keep it up to date, you'll find that one day you have no more low frequencies. -Similar things can happen if your HF permit is out of date.
-Sounds to me like a few people have let them lapse... don't forget that if you buy them at the same time, they'll both naturally expire at the same time, so that's why things get all mid-rangey all of a sudden.
I recently lost my mixing license. -I got clocked doing 135BPM in a chorus that should have been no faster than 65... They didn't even give me any points, they just tore up my license! -I wanted to try and cop a plea, see if I could get off with a 16-bit/44.1 limitation for a while, but the judge (Judge Producer... known as a bad-tempered old git!) was having none of it.
:sad:
Keef
G
Guest
Guest
Keith - you had going for a second - just a second mind you
