Neil’s
Plate Amp Mod Page
Note: you MUST read the fine
print at the bottom of this page before using this information
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Mod
#1: Making the Audiosource 30009 100W plate amp “fullrange” |
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Description |
This is a simple mod that bypasses the low-pass filter and bass boost to make the amp full-range. The volume control and “auto-on” still works |
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Schematics |
PDF (before) |
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Photo |
Remove the jumper at the red X and add the jumper at the green circle |
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Mod
#2: Changing the transformer in the
Cerwin Vega full-range amp |
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Description |
This is a nice amp that has the misfortune of having a 220V transformer. The link describes the amp and the mods |
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Link |
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Mod
#3: Making the Parts Express SA25 full
range |
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Description |
This amp is small but may not be small enough—make sure you measure before cutting holes in your speakers. However, the result is a good quality amp—perfect for a well-designed mini speaker for your computer or iPod. This mod simply bypasses the filter circuitry. |
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Instructions |
Requires basic soldering skills |
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Mod
#4: Making the MCM 56-6267 amp
full-range |
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Description |
MCM has a decent quantity of these amps at a great price (2 for $55). They are well-built, fairly small, and put out an honest 40W. |
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Instructions |
It’s easy to make the amp full-range. Requires disassembly of preamp to upgrade the op amps |
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Mod
#5: A SA25/T-amp Hybrid |
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Features |
Coming soon (maybe). This mod replaces the SA25 amp with a modified Sonic Impact board. The speaker connectors are used to get the second channel to the second speaker. The T-amp is powered by a 5-amp switching regulator. |
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Power Supply |
ExpressPCB schematic |
ExpressPCB PCB |
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Instructions |
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Photos |
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Fine Print Section These mods are to equipment that use dangerous voltages. This information is made available for people to use at their own risk. It is possible, and actually very easy, to totally screw things up and to hurt yourself in the process. If you don’t have proper training in soldering, if you don’t have proper technician equipment and if you don’t have an adequate understanding of basic electronics you should not attempt any of the mods that are shown on this page. Support Note You are on your own with these--I don’t have the time to assist in making or further explaining any of the modifications that are shown here. I’ve got a demanding full-time job and I believe that my spare time is better spent working on new projects (which I will probably make available to others). I may answer a question or two, but I don’t want to get bogged down in supporting older designs. Your understanding is appreciated. |
