Hi Brent,
you've done quite a few mods to your amp. which mods made the most difference? i would like to do something similar with mine but the cost of those black gates are very discouraging.
if, for example, i replaced the standard elna's with cerefines would it make much difference?
also, for the large power supply caps, how did you secure the cap in the space?
thanks
you've done quite a few mods to your amp. which mods made the most difference? i would like to do something similar with mine but the cost of those black gates are very discouraging.
if, for example, i replaced the standard elna's with cerefines would it make much difference?
also, for the large power supply caps, how did you secure the cap in the space?
thanks
Hi Brent,
thanks for the suggestion.
i was thinking of replacing the power caps but i can't find anything that will fit exactly (with the same size as the originals). do you have a pic of yours?
i was thinking of tweeking the bias current as you did. how did that affect the sound?
would cerafines all round be a good idea/improvement? they are, afterall, elna and there's plenty of the standard ones already onboard the amp.
thanks for the suggestion.
i was thinking of replacing the power caps but i can't find anything that will fit exactly (with the same size as the originals). do you have a pic of yours?
i was thinking of tweeking the bias current as you did. how did that affect the sound?
would cerafines all round be a good idea/improvement? they are, afterall, elna and there's plenty of the standard ones already onboard the amp.
Here are the large images from inside 2 of my KI amps L/R AMP Centre AMP . Use the centre channel amp to start off with for you mods upgrades. The cerefines should be ok, not as good as the BG but still good. Try them and see how you like the overall improvement.
Be very careful with bias current, go silly and you will blow up your outputs. First of all from cold monitor both channels on the bias as per the service manuals instructions. If you are going to adjust the bias a tad i advise fitting precision pots so you can adjust spot on. Dont take the standard mV much above 20mV either on those heatsinks, also the standard idle setup says 6 mins for 14mV well I would work to 10mins minimum for 20mV.
You get a slightly smoother and more dynamic sound from this, just another little tweak that adds up.
Brent
Be very careful with bias current, go silly and you will blow up your outputs. First of all from cold monitor both channels on the bias as per the service manuals instructions. If you are going to adjust the bias a tad i advise fitting precision pots so you can adjust spot on. Dont take the standard mV much above 20mV either on those heatsinks, also the standard idle setup says 6 mins for 14mV well I would work to 10mins minimum for 20mV.
You get a slightly smoother and more dynamic sound from this, just another little tweak that adds up.
Brent
SimontY said:
does 3.3 uF too small cap value for all the signal bandwith
I am seeing that at the output stages of cd players In decoupling cap Is 100 uF elektrolyt and the output decoupling cap Is 47 uF elektrolyt
My player has that values and I don't know exactly with what value to replace
Wow can i just say a big thanks to this forum. I've had a Marantz PM 66 Ki that hasn't been working for about 4 years. I wanted to get this beast working again so decided to search the web for common problems of this amp and came accross this thread where user "rowemeister" commented
So i hastily had a search inside my amp and low and behold a 47ohm resistor at R802 had blown, quick trip to maplins and 15 minutes soldering later, she's singing again
To say i'm chuffed to bits is an understatement
Just a quick question, i'm quite new to this (only found out yesterday what the different colours on the resistor meant!!) and couldn't match the resistor exactly at maplins.
The one in the amp is Yellow, Purple, Black, Brown and then White (Can't find a reference for a resitor with white at the end ??)
The one i got is Yellow, Purple, Black, Gold and then Brown which = 47ohm +/- 1 % tolerance.
Do you think it will be ok or should i try and hunt down for the exact colour match ?
So i hastily had a search inside my amp and low and behold a 47ohm resistor at R802 had blown, quick trip to maplins and 15 minutes soldering later, she's singing again
To say i'm chuffed to bits is an understatement
Just a quick question, i'm quite new to this (only found out yesterday what the different colours on the resistor meant!!) and couldn't match the resistor exactly at maplins.
The one in the amp is Yellow, Purple, Black, Brown and then White (Can't find a reference for a resitor with white at the end ??)
The one i got is Yellow, Purple, Black, Gold and then Brown which = 47ohm +/- 1 % tolerance.
Do you think it will be ok or should i try and hunt down for the exact colour match ?
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