Caiman passive output mod revealed

Hi, I put a couple of 10uF Panasonic film caps in place of the 10,000uF reservoir cap. I did detect a slightly improved level of fine detail. My cable from the SuperTeddy PSU is only about 20cm long. There is a photo way back in these pages.

EDIT: there's a photo here http://theartofsound.net/forum/showp...&postcount=789

Quote:

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Originally Posted by chrism

I like it!

Certainly cleaner sounding now that the Hitano cap has gone and replaced by the big yellow 10uf. Sounds much more bouncy and alive so I suspect that the 2 No. 10,000uf caps were deadening things a bit.

I will have a look at taking the doide out and wire linking next as I don't really need it now that my PS has double regulation.

Next step is to take out the Murata's and feed 5v and 12v dedicated supplies straight into the Caiman (my PS has already been built with 2 No. traffos in it).

Regards

Chris

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Hi Chris,

Glad to here on another small improvement. I am planning to put in two high quality RCA sockets and dedicated earth wires back to power input rail I can then connect the output caps straight into the RCA's.

Cheers Andy

hey guys
wanting to do the passive mod but need some advise on caps please,
My preamp (booklet) says
Input and sensitivity for 775mV output

phono MC :250uV
Phono MM :3.5mV
CD :150mV
Tuner :150mV
AUX :150mV
Tape :150mV
RIAA Equalization :30Hz to 20kHz +/- 0.5dB

OUTPUT
via phono connectors
output impedance less than 100 Ohms
Bandwidth 10Hz - 50kHz +/- 3dB

which ones do you recommend please ?
at the moment ive swapped the opamp for the LME49720HA DUAL OPAMP which imo is fantastic as my setup is very bass'y this one lightens it up a bit instead of music sounding like a movie soundtrack.

MONOBLOKS says Input And Sensitivity 1.4V

cheers
Mark

CD input ;)

que ? :)

Sorry, it's capacitor values you want innit :doh:

If film caps go for a minimum of 2.2uf, better off with 10uf but it's finding them & ones that'll fit :lol: I'm sure someone linked to some decent 10uf film caps on here at a reasonable price ;)

thanks Mark, yeh ive seen lots of different ones in the thread but was just wandering if with the impedance of my preamp i should consider a particular one, sorry but im not so clued up on this and after 90 odd pages im still spinning.
So if i go for 2.2uf which voltage please ?

Mark

Actually you haven't specified the input impedance of any of the inputs :eyebrows: Not your fault as you probably don't have that information, we'll assume it's pretty standard at about 47,000K ohm ;)

The higher the voltage capacitor that you fit the less distortion there will be is all i can say in reality :) You should be able to find 2.2uf 400V caps that will fit, but if you go for 10uf then you will probably be restricted to 100-150V or so.

In reality the distortion will be miniscule as we are talking about a signal of less than 2V RMS & it'll only manifest itself near the cutoff frequency which will likely be less than 10Hz anyway ;)

If it was me i'd go for the biggest (highest voltage rating) 10uf caps i could find as this will lower the -3Db frequency which shifts the distortion lower, but it'll reduce the phase shift caused by the capacitor in the audio band, specifically in the lower bass registers..

Try bypassing it with a 100nf (0.1uf) even higher quality capacitor like a silvered mica or polystyrene for even better results ;)

That's just what i'd do though :cool: Others might not be of the same opinion..

Cheers Mark
Thanks for taking the time to explain what i need its appreciated :cool:


i know ebay china stuff is not rated to buy but found THESE ?
cant seem to find any in stock anywhere else.


and also a nice idiots guide on capacitors HERE


Mark

You won't fit them in the case, trust me ;) They'll be humungous :eyebrows:

Take your pick

Metalised Polyester (MKT) is a reasonable film capacitor, if you bypass them with something better but smaller you should be laughing :)