Point to Point build tips

nightanole · 25th August 2011, 02:03 PM

This will be my 2nd attempt and doing a pp point to point build (first one didnt turn out so good). Any tips on what do do first?
I was thinking:
Wire heaters first as close to the alum chassis as possible, strait across the pp pair.
Wire the power supply in the corner.
Make a buss ground along the center of the amp out of solid core house grounding wire(12 gauge).
wire high voltage as close to the chassis as possible.
Wire the rest of the amp, trying my best to keep things at a 90 to the power and heater wires.

Also im wiring new school, so chassis is earth ground, then ground loop isolated to power/signal ground, and input is isolated from chassis. On that note im using an internal usb dac, and was wondering if i should earth ground the usb cable shield, or leave the whole thing float since pc shield is normally pretty noisy.

DF96 · 25th August 2011, 04:01 PM

AC heaters need tightly twisted wire near the chassis. DC heaters it doesn't matter.

Bus ground is fine, as long as things connect to it in the right order and you don't use it as part of the PSU ground. Keep charging pulses well away from the bus, then just connect a single wire from PSU ground to bus.

Keep connections fairly short, and use grid stoppers (small ones for hi-fi, bigger for guitars).

v4lve lover · 26th August 2011, 01:29 PM

tektronic ceramic tag strips . silver solder . and nice solid core wire not tho tick tho .

TheGimp · 26th August 2011, 02:08 PM

When I'm running a busbar ground for input and preamp tubes I still make a star ground with the filter caps, output tube cathode connections, and bus connecting at the same point. This is also my ground to chassis point. This helps keep the output tube current and charging current out of the preamp stage ground.

25th August 2011, 02:03 PM	#1
nightanole diyAudio Member Join Date: Feb 2009	Point to Point build tips This will be my 2nd attempt and doing a pp point to point build (first one didnt turn out so good). Any tips on what do do first? I was thinking: Wire heaters first as close to the alum chassis as possible, strait across the pp pair. Wire the power supply in the corner. Make a buss ground along the center of the amp out of solid core house grounding wire(12 gauge). wire high voltage as close to the chassis as possible. Wire the rest of the amp, trying my best to keep things at a 90 to the power and heater wires. Also im wiring new school, so chassis is earth ground, then ground loop isolated to power/signal ground, and input is isolated from chassis. On that note im using an internal usb dac, and was wondering if i should earth ground the usb cable shield, or leave the whole thing float since pc shield is normally pretty noisy.

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25th August 2011, 04:01 PM	#2
DF96 diyAudio Member Join Date: May 2007	AC heaters need tightly twisted wire near the chassis. DC heaters it doesn't matter. Bus ground is fine, as long as things connect to it in the right order and you don't use it as part of the PSU ground. Keep charging pulses well away from the bus, then just connect a single wire from PSU ground to bus. Keep connections fairly short, and use grid stoppers (small ones for hi-fi, bigger for guitars).

26th August 2011, 01:29 PM	#3
v4lve lover diyAudio Member Join Date: Aug 2010 Location: Near Eindhoven, the sanctum of the pentode. and among that other things.	tektronic ceramic tag strips . silver solder . and nice solid core wire not tho tick tho .

26th August 2011, 02:08 PM	#4
TheGimp diyAudio Member Join Date: Aug 2009 Location: Johnson City, TN	When I'm running a busbar ground for input and preamp tubes I still make a star ground with the filter caps, output tube cathode connections, and bus connecting at the same point. This is also my ground to chassis point. This helps keep the output tube current and charging current out of the preamp stage ground.