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heater wiring
heater wiring
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Old 16th March 2012, 02:48 PM   #1
mashaffer is offline mashaffer  United States
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Location: Indiana
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.

heater wiring-smpreampplatecloseup-jpg

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?

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The only reason I drive the 91 Colony Park is that I can't afford a 65. Me old school? Couldn't be.
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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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heater wiring
Old bakelite sockets aren't the last word in reliability. Seems like an ambitious project that justifies better sockets and more space? JMO
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
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Old 16th March 2012, 04:22 PM   #4
Alexontherocks is offline Alexontherocks  Italy
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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
trobbins is offline trobbins  Australia
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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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