Caiman passive output mod revealed

Quote:

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Originally Posted by Reid Malenfant

How much worse are they than any standard wet electrolyte electrolytic? I mean they all leak to a certain extent though we should be talking micro Amperes in reality.

Do you happen to know how much worse the solid electrolytics (SEP) are by chance? 10%? 100%? Sorry, i gots to know :eyebrows:

Cheers in advance Leo :)

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The leakage was enough in one case it set off an amplifiers DC protection on the output.

I've repaired quite a few item belonging to friends mostly what they'd modded themselves , Sanyo Oscons they fitted caused majority of problems ranging from DC leakage when used as coupling caps or used in the FB to high frequency instability when used on the output of LM317 based regulation caused by the low ESR.

Oscons are good caps but after previous experience I feel care is needed if using them, they can in some cases cause the inexperienced tweakers headaches :)

Cheers Leo, a pretty comprehensive answer ;)

A good bit of thought obviously needs to be put into if it's wise to use them then under certain circumstances :eyebrows:

too rich for my blood! :)

Greetings All
I have read this mod. with using caps only and removing the OP board.
I have a 7250 which has 826 installed. I have a pair of REL caps from my Atma-Sphere MP3 pre amp. I have a pair of .10uf and .47uf 400V. Can I use either of these caps as coupling caps in my 7250.
Thanks
Bryan

Depends on the input impedance of you preamp/amp.Do you know what the value is?

Hi BryanP,

Ali is correct about checking the input impedance of your amplifier, but it is most likely that those capacitance values are too small and would end up filter out a noticeable amount of bass.

Andrew

The 0.47uF should be fine for a preamp with a 50k input impedance.

Agreed Clive,I'm using 0.47uF with my WAD Pre 2,which has an input impedance of 100k.

Greetings All
I installed the REL-Caps .47uf 400 volt. The improvement to the sound is wounderful. I am a believer!!
Much more open and detailed bass.
Works great into my PS Audio PCA-2 pre-amp
Thanks for the info.

HI,
As I got carried away with success and good SQ with MLC5/6 mod I also wanted to try passive output mod as it seems quite simple and I had some spare caps.
Anyway, it was not that simple as after doing this fiddly job only one channel was working (right) and I also did not like the sound as much as with opamps hence I wanted to return to normal opamp mode.
After de soldering the caps and bridging the RCA sockets, there is not sound anymore coming either from fixed, variable and headphone outputs.What could be the problem?
Thanks