Hi,
I've recently bought an older Drawmer DL221 compressor. It's a nice box with a simple circuit design from the 80ies. One of the channels is quite lacking in bass, however.
Here are some pictures of the innards: imgur.com/a/G08cN. I took pictures of the ICs, as they might be contenders for replacements. There are five TL072's, and one NE5532 (equivalents).
Is there a usual cause for this problem? Capacitors going bad? ICs?
Thanks.
I've recently bought an older Drawmer DL221 compressor. It's a nice box with a simple circuit design from the 80ies. One of the channels is quite lacking in bass, however.
Here are some pictures of the innards: imgur.com/a/G08cN. I took pictures of the ICs, as they might be contenders for replacements. There are five TL072's, and one NE5532 (equivalents).
Is there a usual cause for this problem? Capacitors going bad? ICs?
Thanks.
Low bass may indicate a bad coupling cap (or cap in a feedback network). Unfortunately recapping this one may be a bit of a pain, as all of the electrolytics are axial, and those have become a bit uncommon. So you'll probably have to look for caps that are used specifically for those functions.
A electroylitic cap would be favourite. Why not rig a couple of caps up with leads and croc clips and just bridge the caps in turn to see if you can pick it up that way. Just remember to turn the volume down before each test clipping.
Thanks guys.
I will check the coupling caps, and see if the error comes from them.
A hint that it might be the coupling caps, is the fact that the error is still present when using the compressor's bypass switch.
I will check the coupling caps, and see if the error comes from them.
A hint that it might be the coupling caps, is the fact that the error is still present when using the compressor's bypass switch.
I haven't started replacing the caps yet.
I see that axial caps are a bit difficult to find, indeed. Can't I just get radials though, if they have the same specs otherwise?
If the specs are the same then there is no problem with radials apart from the obvious physical/appearance side of things.
Alright. It's not very crowded in this thing thankfully, so that won't be too much of a problem I think.
You're right, they seem to be available actually.
There are just not as many different variations of them.
Here is a list of 22µF 25V, caps from RS: Aluminium Capacitors - 22µF.
There seem to be one suitable axial. All the others are radial, but are some of them better than the others, for this application?
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