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In Reply to: RE: output caps for Marantz cd5004 posted by alley -kat on June 21, 2016 at 10:36:36
AK
You can jump the cap out if you want to try it but if there is any DC present on the input jacks of your preamp,you can damage the output as there will be nothing to block the DC from feeding back to the output stage of the player..The cap was put in there for a reason.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Follow Ups:
In most commercial equipment, they will use an input coupling cap and an output coupling cap. They have no idea what other equipment will be used with it, so they (correctly) assume that the cap will be needed. However, you don't need two caps in series. So if both pieces of equipment have a cap, its fine to jumper one. You may also want to remove a ground reference resistor, since you wont need two of those either. If you are not very experienced with electronics, just leave them alone, but if you want all of the performance that can be had, its good to go through and optimize.
I agree with you that you don't need two caps in series..If you know the equipment used and don't have to worry about DC offset,then you would be ok.
Here is another thing that many people don't realize..Later tube preamps always use a super large output cap in the CF and we are talking 3uf to 5uf many times while being bypassed with a smaller .47 a lot of the time..They do this because a lot of people have SS amps which are low impedance by nature and this helps drive that low impedance.If you are just going to drive tube amps with an input impedance of 100k to 470k,it is senseless having that big cap in there because the .47uf would be more than adequate in most cases. I always take it out and I lose no bass and I have gained more midrange clarity.
A good example of this are all the Marantz 7c circuit reissues out there and other than pulling the tonal circuit switching,the only other thing they did was increase the size of the output coupler for the reason I described in the beginning.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Thats correct. The output coupling cap on most gear, whether tube or SS is usually much larger than necessary. If you know the input Z of the following device, its easy to calculate what you need. I usually end up yanking the nasty electrolytic out and installing a smaller value film cap. Bass extension is still fine. Even if you dont know the input Z, use a scope and signal generator to measure the -3db point, and go from there.
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