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Old 12th April 2009, 09:21 PM   #1
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Default Hypex and AC Coupling - newbie question

Hi all gentlemen. Dumb question I know,,, please bear with me, I'm learning

I'm using a tube preamp with a UcD180 poweramp. On the hypex site there's written that it's possible for tube amps to produce the anode voltage to the output on turn on/off transients and kill the hypex.

I mailed the hypex guys [many thx as always Frank] and they explained me to AC couple the pre and poweramp. Frank suggested to use a 1 or 2uF cap for the job.

Now, on the preamp, I got a 0.1uF cap right before the output [in series] but I've been suggested by many a person to use a 1uF cap. I know in hifi preamps you use bigger output caps but this is a guitar preamp and it works ok with the 0.1uF sound-wise. Also, the leads of the 3.3uF cap I got are too big to fit in the preamp pcb so I'd like to leave the 0.1 in there.

Now the question: with regard to dc blocking, is a bigger cap needed or is it just the same?

Looking at the reactance formula, with a frequency of 0 [direct current] you get infinite reactance, no matter what capacitance your cap is, so I'd say it's not an issue and I can leave the 0.1uF in place,,, am I right?
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Old 12th April 2009, 11:26 PM   #2
glt is offline glt  United States
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Basically a 1 uF blocking cap lowers your 3 db low frequency cut off point compared to the .1 uF
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Old 13th April 2009, 08:03 AM   #3
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yes, lol, that's what everybody is telling me,,, thing is I know that and I don't need that, the thing has enough bass like it is,,, I'm just concerned about dc blocking, do you think it'll work?
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