mega lord
Centre tapped
Hi,
Over the last three weeks i have replaced the feedback caps in my nap140 and nac72 321 boards with 22uf MMK's.
In the 140 i have used sections of rubber eraser cut into oblongs and hotmelt glued to the board to provide a mount for the caps to be glued on (on their sides. This raises them so they are clear of surrounding components and flying leads of ptfe silver wire are used in the shortest length possible. This mounting method seems to work and the properties of rubber as a material with regards to vibration should be acceptable. Do you agree?
With the nac 72 i scratched my head a fair bit when trying to work out the best place to mount the mmk's. I had to take into account the fact that 10uf smr's will be used as signal caps at some point so , i made sure enough room was available for them in the future. The result was the mmks hotglued on top of the volume pot. Is this acceptable do you think? Will i be getting any horrible crosstalk or nasty effects from the pot? (feedback resistor was changed to 2K welwyn rc55y).
As regards the sound - at once it was evident there was more detail coming through and much greater clarity, all with the PRaT intact. The change in bass is awesome - at first it seemed like there was less of it coming through but what has actually happened is that a degree of bloatedness has been stripped away which enables every note to be heard in its own right. This was backed up by listening to some Jaco Pastorius - some of his fast bass runs did'nt quite make sense before, but now you can clearly hear every note stop and start, harmonics are gorgeous and i think i know what bass guitar he used.
Treble is equally as good.
Will i be going too far if i replace all the signal caps with smr's? I dont want to ruin the sound and create more work by having to pull them out and use somethin else .
thanks stu
Over the last three weeks i have replaced the feedback caps in my nap140 and nac72 321 boards with 22uf MMK's.
In the 140 i have used sections of rubber eraser cut into oblongs and hotmelt glued to the board to provide a mount for the caps to be glued on (on their sides. This raises them so they are clear of surrounding components and flying leads of ptfe silver wire are used in the shortest length possible. This mounting method seems to work and the properties of rubber as a material with regards to vibration should be acceptable. Do you agree?
With the nac 72 i scratched my head a fair bit when trying to work out the best place to mount the mmk's. I had to take into account the fact that 10uf smr's will be used as signal caps at some point so , i made sure enough room was available for them in the future. The result was the mmks hotglued on top of the volume pot. Is this acceptable do you think? Will i be getting any horrible crosstalk or nasty effects from the pot? (feedback resistor was changed to 2K welwyn rc55y).
As regards the sound - at once it was evident there was more detail coming through and much greater clarity, all with the PRaT intact. The change in bass is awesome - at first it seemed like there was less of it coming through but what has actually happened is that a degree of bloatedness has been stripped away which enables every note to be heard in its own right. This was backed up by listening to some Jaco Pastorius - some of his fast bass runs did'nt quite make sense before, but now you can clearly hear every note stop and start, harmonics are gorgeous and i think i know what bass guitar he used.
Treble is equally as good.
Will i be going too far if i replace all the signal caps with smr's? I dont want to ruin the sound and create more work by having to pull them out and use somethin else .
thanks stu