2. amps-preamps
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Impedance Question?

OK so I know there's a lot of threads about matching impedance with pre/amp.  It would be really nice if someone could help out here! The whole impedance thing confuses me (doesn't take much).

So if I have an amp that has 10k impedance what range for output impedance would work for a preamp?

Any help would be great!
sqitis
sqitis OP
55 posts
 
And that is why I'm leaning towards a direct coupled SLP-98 with some 50's JAN tubes.
toddverrone's avatar
toddverrone
840 posts
 
@georgehifi oh man, sorry. I didn't mean to repeat myself. I've the schematics for my pre somewhere, I'll see if I can figure out what value the coupling cap is. 
What formulae are you using to calculate low frequency roll off?
georgehifi's avatar
georgehifi
10,312 posts
 
(2 pie x 10kohm x 5uf)

6.28 x 10000 x 5 to the minus 6, = then 1/x (reciprocal) the answer
which equals -3db @ 3.18hz

Cheers George


georgehifi's avatar
georgehifi
10,312 posts
 
Before anyone corrects me on pie, I’m an Aussie we love our beer, meat pie’s/ with blood.

Cheers George
toddverrone's avatar
toddverrone
840 posts
 
Wait, the answer is a number (I've yet to calculate). Is that the gain or the frequency? How do you find the other?
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