Hey,
Using headers for all the valves, OP and IP trafo/choke connections, is it viable to put the rest on a circuit board? Just thinking it'd lessen the likelihood of stuff shorting out etc. I've Protel, and access to a milling machine 😀
L
Using headers for all the valves, OP and IP trafo/choke connections, is it viable to put the rest on a circuit board? Just thinking it'd lessen the likelihood of stuff shorting out etc. I've Protel, and access to a milling machine 😀
L
Yes, absolutely. Many new amps are built that way.
For the valves, rather than use a header connected by a cable to the valve socket on the chassis, ( which is what I think you are describing ), you can use a pcb type tube socket instead. Or what I have done is use a regular old chassis type tube socket on the pcb with short jumper wires connected to points on the board.
For the valves, rather than use a header connected by a cable to the valve socket on the chassis, ( which is what I think you are describing ), you can use a pcb type tube socket instead. Or what I have done is use a regular old chassis type tube socket on the pcb with short jumper wires connected to points on the board.
I was thing that, but there's a problem with some of the capacitors and clearances to the top of the chassis 🙁!!
L
L
If your trying to do PCB but panel mounting the tubes. Design it so that the sockets are mounted on the opposite side of the PCB from the components.
Yup - I've personally chosen a PCB WAY bigger than I need, so that'll allow me to have a bank of connectors at one end (power), another at the other (valves), and keep all the components over by the power end, and keep the tracks well away from each other - ie. all the components are about 2x2", board is 9x12"....
Since you said component clearance was not enough with chassis top. It was suggested to mount the components on the opposite side of the board. Meaning mount the components on the bottom of the PCB and mount the sockets on the top. Clearence issue will be solved.
See how the sockets are mounted on the opposite side
It allows you to panel mount the tubes when using a PCB.
See how the sockets are mounted on the opposite side
An externally hosted image should be here but it was not working when we last tested it.
It allows you to panel mount the tubes when using a PCB.
Jeb - is your heater wiring onboard?!
I've kept my HT and signal onboard (DC doesn't interfere with signal 😛) and kept heaters offboard so they can be overkill-style treated for interfering with signal with twisting and braiding etc.
L
I've kept my HT and signal onboard (DC doesn't interfere with signal 😛) and kept heaters offboard so they can be overkill-style treated for interfering with signal with twisting and braiding etc.
L
That's actually not my amplifier, I just used the picture to show what I was talking about regarding mounting the capacitors on the opposite side of the board from the tubes.
Usually if using DC heaters, I'll run the lines on be board, because the rectifiers, filter cap and regulator (if using one) is mounted on the board. Even though it's DC, it's best to avoid running the lines too close while parallel to signal lines. And also, if it's a double sided board run the heater V+ and it's ground return overlapped on opposite sides of the board.
If using AC heaters, I twist the transformer heater wires and solder them strait to the socket pins.
Usually if using DC heaters, I'll run the lines on be board, because the rectifiers, filter cap and regulator (if using one) is mounted on the board. Even though it's DC, it's best to avoid running the lines too close while parallel to signal lines. And also, if it's a double sided board run the heater V+ and it's ground return overlapped on opposite sides of the board.
If using AC heaters, I twist the transformer heater wires and solder them strait to the socket pins.
Same as I am (putting the AC heaters offboard).
Here's pictures so far
http://www.flickr.com/photos/psychobiker/sets/72157604051618142/
Here's pictures so far
http://www.flickr.com/photos/psychobiker/sets/72157604051618142/
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