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Old 18th February 2008, 10:10 PM   #1
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Default Printed circuit board designing?

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
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Old 18th February 2008, 10:54 PM   #2
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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.
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Old 18th February 2008, 11:25 PM   #3
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I was thing that, but there's a problem with some of the capacitors and clearances to the top of the chassis !!

L
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Old 19th February 2008, 12:35 AM   #4
Jeb-D. is offline Jeb-D.  United States
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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.
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Old 19th February 2008, 10:25 AM   #5
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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"....
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Old 19th February 2008, 04:30 PM   #6
Jeb-D. is offline Jeb-D.  United States
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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
Click the image to open in full size.

It allows you to panel mount the tubes when using a PCB.
Click the image to open in full size.
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Old 20th February 2008, 01:08 AM   #7
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All well and good, but our machine don't do that
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Old 20th February 2008, 04:59 AM   #8
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Is the problem that you have to mirror the connections to the tube sockets?
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Old 20th February 2008, 10:41 AM   #9
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On second thought, that actually shouldn't be a problem
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Old 23rd March 2008, 12:14 AM   #10
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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
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