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Chassis wire
Chassis wire
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Old 11th November 2017, 12:21 PM   #41
kodabmx is offline kodabmx  Canada
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I just use PVC covered 22AWG Solid core tinned copper hook up wire. The only time I've had to use better wire was from the phono RCA input to the grid of the input tube where I used a shielded beldon 22AWG stranded wire. Granted I don't need to run RF but the results are plenty good.
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Old 11th November 2017, 12:38 PM   #42
JeffYoung is offline JeffYoung  Ireland
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Chassis wire
Quote:
Originally Posted by kodabmx View Post
I just use PVC covered 22AWG Solid core tinned copper hook up wire. The only time I've had to use better wire was from the phono RCA input to the grid of the input tube where I used a shielded beldon 22AWG stranded wire. Granted I don't need to run RF but the results are plenty good.
Ditto (only my 22 AWG shielded is Lake rather than Belden).
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Old 11th November 2017, 02:00 PM   #43
kodabmx is offline kodabmx  Canada
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In reality I probably don't need the shielding anymore. It was picking up RF due to me mistakenly using a 22K resistor instead of a 100R!

How is it to work with? The Belden is rigid but not in a good way, it doesn't stay where you put it, it stays coiled or however it was

Last edited by kodabmx; 11th November 2017 at 02:02 PM.
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Old 11th November 2017, 02:56 PM   #44
JeffYoung is offline JeffYoung  Ireland
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Chassis wire
The Lake is a pain in the rear too. You can see here that I clipped it to the side of the chassis:
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Old 11th November 2017, 05:00 PM   #45
kodabmx is offline kodabmx  Canada
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Yours is a much simpler design. Nice.

Here's a recent pic of the underside of mine... the red wires are the Belden wire...
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Old 11th November 2017, 05:07 PM   #46
scottjoplin is offline scottjoplin  Wales
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Old 11th November 2017, 05:23 PM   #47
kodabmx is offline kodabmx  Canada
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What? It contains a buffer, a line stage, a phono stage, a headphone stage, and a 6550 output stage with regulated screens. Oh and level meters... 22 tubes total. 9 inputs switched by relay, line out, 4 buffered outputs.

Here's the topside...
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Last edited by kodabmx; 11th November 2017 at 05:27 PM.
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Old 11th November 2017, 05:33 PM   #48
scottjoplin is offline scottjoplin  Wales
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What?
Lovely
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Old 11th November 2017, 05:50 PM   #49
JeffYoung is offline JeffYoung  Ireland
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That's some glassware, all right.
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Old 12th November 2017, 08:28 AM   #50
marce is offline marce  United Kingdom
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Chassis wire
Quote:
Originally Posted by scottjoplin View Post
At microwave frequencies you are hard pressed to keep the signal IN a wire!
In all signals I thought the signal travelled through the dialectic.

We worry about signal propagation on high speed digital designs, especially for the high speed interfaces such as DDR3, as depending on the PCB build you get different signal propagation depending on the dielectric used between the copper foils and cater for the sections that are microstrip (surface layers) and stripline (inner layer, preferably between two return paths). So for timing budgets we have to know the true signal transmission time from preferably die to die (some IBIS files include data withing the chip including bonding wires) so that we can get all the signals at the right place and more importantly at the right time, often down to 0.25mm difference in signal lengths (approx 2ps) and can be shorter for critical diff pairs. For domestic Audio signals I don't think signal speed is much of an issue if the correct cables are used... As specified for the interface.
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