This amp has plenty of bipolars in the finals, a reasonably sized PS tranny and good cooling. The two filter caps are small, however. Is the main compromise with this (small?) cost savings in filter capacity the amp's dynamic range - especially bass frequencies?
Internal space is limited so I'm wondering if upping the uf's (to a worthwhile degree) can be accomplished without changing the rectifier diodes. Would I have to increase the capacity approximately fourfold, would that have to be mounted externally and is it worthwhile? The CE 1000 is 21 years old.
The amp is currently used in bridged mode driving a four ohm bass guitar cab with reasonable results for now. My hunch is to upgrade the existing caps using the existing PCB space.
Thanks for your help and opinions.
Internal space is limited so I'm wondering if upping the uf's (to a worthwhile degree) can be accomplished without changing the rectifier diodes. Would I have to increase the capacity approximately fourfold, would that have to be mounted externally and is it worthwhile? The CE 1000 is 21 years old.
The amp is currently used in bridged mode driving a four ohm bass guitar cab with reasonable results for now. My hunch is to upgrade the existing caps using the existing PCB space.
Thanks for your help and opinions.
You could up them to 2N5404 same range as the 2N4004 just 3 amps as opposed to 1 but please note when you do increase the value of the capacitors remember switch on surge and your amp has an in line 4 amp fuse --that fuse is there for a reason usually the transformer.
The main rectifier for a 196V 1,000 Watt amplifier is surely not 1N4004.
It is a module "35A 400V Bridge Rectifier C 8752-2" (page 38 in the 581-page service manual).
Personally, I think Crown knows their stuff. The caps may be small but only against hi-fi-fanatic expectations. They will hold-up between 60Hz half-waves fine. If this amp is not performing to your needs buy a for-purpose bass stage amp.
It is a module "35A 400V Bridge Rectifier C 8752-2" (page 38 in the 581-page service manual).
Personally, I think Crown knows their stuff. The caps may be small but only against hi-fi-fanatic expectations. They will hold-up between 60Hz half-waves fine. If this amp is not performing to your needs buy a for-purpose bass stage amp.
I have the Crown-CE 1000 pwramp downloaded into a folder on my PC as I type and 4 SMB4004 are shown not a bridge rectifier but maybe I am looking at the power for the input section .
Yes the power supply section for the output is not shown in the schematic I am looking at.
Yes the power supply section for the output is not shown in the schematic I am looking at.
Thank you for all replies. The amp has held up almost perfectly for two decades. Since it may be advisable to replace those caps at some time (now?) I was curious if anyone thought it worthwhile to up the capacitance. Seems that if I maintain or increase the working voltage, more capacity won't be too noticeable for my needs.
Only one odd mystery occurred, and only once. The amp was left on overnight without any input except for the ancient Wurlitzer guitar preamp idling with nothing connected. The next morning the cooling fan was running. The Crown was somewhat warm like it had been used. Ultrasonics or other noise leaking from the Wurlitzer? It's often is left on without activating the fan.
Only one odd mystery occurred, and only once. The amp was left on overnight without any input except for the ancient Wurlitzer guitar preamp idling with nothing connected. The next morning the cooling fan was running. The Crown was somewhat warm like it had been used. Ultrasonics or other noise leaking from the Wurlitzer? It's often is left on without activating the fan.
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