I am working on restoring a nearly destroyed Lafayette KT-550, the less famous step-brother of Hegeman's famous Citation II.
The amp in question was exposed to the elements and needs new PCBs. Because PCB layouts are far outside my area of expertise, and because Hegeman and Ed Duda (the designers of the amp) were no slouches, my initial instinct was to reproduce the originals with only modifications to fit modern parts. But I'm sure, given the decades that have passed and the advent of multi-layered PCBs, there may be a better way.
What do you think? What would you do with the below?
The PCB houses the pre/inverter/driver stages as well as all the feedback loops. Everything highlighted is off-board.
Here is the original single-sided PCB layout:
Here is my two-layer re-creation. Note that I moved C4, C7, C8, C11, and C12 below-board, which is why their silk-screening is not present in this view. Their lead holes are labeled, however.
The amp in question was exposed to the elements and needs new PCBs. Because PCB layouts are far outside my area of expertise, and because Hegeman and Ed Duda (the designers of the amp) were no slouches, my initial instinct was to reproduce the originals with only modifications to fit modern parts. But I'm sure, given the decades that have passed and the advent of multi-layered PCBs, there may be a better way.
What do you think? What would you do with the below?
The PCB houses the pre/inverter/driver stages as well as all the feedback loops. Everything highlighted is off-board.
Here is the original single-sided PCB layout:
Here is my two-layer re-creation. Note that I moved C4, C7, C8, C11, and C12 below-board, which is why their silk-screening is not present in this view. Their lead holes are labeled, however.
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Its not a complex amp so the layout is probably ok.
Important things are to keep input signal path short and screened where possible
I put a ground plane on my valve amp pcb's especially around signal input.
Ground planes come free, in fact better as they don't need dissolving off the pcb into the etching fluid.
Important things are to keep input signal path short and screened where possible
I put a ground plane on my valve amp pcb's especially around signal input.
Ground planes come free, in fact better as they don't need dissolving off the pcb into the etching fluid.