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Old 16th March 2012, 02:48 PM   #1
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Default heater wiring

Taking an new tack on the preamp section of my mini-console project. I am planning on using an old equalizer chassis to support the tone generator plate from an old Baldwin organ which has 5 9 pin sockets rather closely spaced. The preamp will use 2 12AY7 and 3 12AU7. The original tone generator circuit used 12V heaters so it has to be completely rewired for my 6V setup.

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The sockets are so close together that it isn't really possible to twist the wires between the sockets however there will be several inches of space below the sockets.

So would it be better to just do straight wires between sockets right up against the plate or should I go in loops downward from socket to socket and twist the pairs together? Other suggestions?

mike
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Old 16th March 2012, 03:05 PM   #2
DF96 is offline DF96  England
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AC heaters need twists, except when there is no low-level audio in the vicinity.
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Old 16th March 2012, 04:07 PM   #3
kevinkr is offline kevinkr  United States
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Old bakelite sockets aren't the last word in reliability. Seems like an ambitious project that justifies better sockets and more space? JMO
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Old 16th March 2012, 04:22 PM   #4
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take the leads of the AC wiring insert them in the mouth of a screwdriver....twist until the wire is on the point of retwisting over itself, take some zipties or equivalent means and block the twisted pair/triplet in multiple points....find the best route for the wiring, cut the twisted pair to the correct measure...optn it up just enough to have leads you can solder and connect..

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Old 17th March 2012, 12:30 AM   #5
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Pins 4,5 can join to pin 9 of the next door socket - that can help minimise the 'clutter' for starters. Then just run interconnect wires around the circumference of the socket, on the chassis, using the shortest distance back to the 'other end' of that valves heater. Maybe there are one of two 'natural' star points, where it requires only 1-2 very short 'pairs' to meet, from where twisted pair can then be used back to the supply.

Last edited by trobbins; 17th March 2012 at 12:33 AM.
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