Minimum Tube Spacing: 6V6 & 12AX7
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glassman
Electron Herder
Re: Minimum Tube Spacing: 6V6 & 12AX7
I'm not aware of any restrictions concerning spacing, published or otherwise. As far as I am aware of spacing is dictated by practicality. I have seen some amps with tube spacing around 1.5", center to center, that yield very good results. Early Budda amps come to mind.
I'm not aware of any restrictions concerning spacing, published or otherwise. As far as I am aware of spacing is dictated by practicality. I have seen some amps with tube spacing around 1.5", center to center, that yield very good results. Early Budda amps come to mind.
StillLearnin'
New member
Re: Minimum Tube Spacing: 6V6 & 12AX7
Yeah - never have seen any information on maintaining a minimal amount of space between tubes. You ever look at some of the old tube radios and stereo amps? They pack 'em in... If you're concerned about heat, put a fan in there. If you have a lot of chassis real estate, then spread them out - makes wire routing and soldering much easier.
Yeah - never have seen any information on maintaining a minimal amount of space between tubes. You ever look at some of the old tube radios and stereo amps? They pack 'em in... If you're concerned about heat, put a fan in there. If you have a lot of chassis real estate, then spread them out - makes wire routing and soldering much easier.
Re: Minimum Tube Spacing: 6V6 & 12AX7
I heard on another forum that the spacing should be at least 1.5 times the size of the tube's envelope. Also, someone said to move the power tubes a bit farther away from the PT. Does it cause any problems, or maybe not problems, but setbacks in tone if the PT and OT are too close together? The reason I ask is that moving them close together would be moving DC and AC currents side by side, which is one reason why PCBs don't sound as good as hand wired.
Thanks.
I heard on another forum that the spacing should be at least 1.5 times the size of the tube's envelope. Also, someone said to move the power tubes a bit farther away from the PT. Does it cause any problems, or maybe not problems, but setbacks in tone if the PT and OT are too close together? The reason I ask is that moving them close together would be moving DC and AC currents side by side, which is one reason why PCBs don't sound as good as hand wired.
Thanks.
glassman
Electron Herder
Re: Minimum Tube Spacing: 6V6 & 12AX7
I really can't se that as a potential problem, assuming that you will have shields on your preamp tubes. Two in-phase signals can capacitively couple and cause a positive feedback issue but the shields, combined with the practical limits of spacing (ability to wire things up) make the tube proximity issue void. The wires connecting stages have more capability of coupling than the tubes themselves do; due dilligence in wire routing should be your main concern.
Tubes are not affected by magnetic interference. That is one of the main reasons that the Russian military still uses tubes in much of thier equipment. There can be a minute amount of coupling between the power tube plated and a transformer but since a capacitor is determined by surface area and proximity of the two surfaces, it makes a very poor capacitor. The effect would be so small it couldn't be measured.
PC boards get a bad rap in general. PC boards are not the "problem"; the problem is board layout. Some manufacturers design thier boards with long parallel traces that can capacitively couple; BUT...the same thing can happen with point to point wiring.
I really can't se that as a potential problem, assuming that you will have shields on your preamp tubes. Two in-phase signals can capacitively couple and cause a positive feedback issue but the shields, combined with the practical limits of spacing (ability to wire things up) make the tube proximity issue void. The wires connecting stages have more capability of coupling than the tubes themselves do; due dilligence in wire routing should be your main concern.
Tubes are not affected by magnetic interference. That is one of the main reasons that the Russian military still uses tubes in much of thier equipment. There can be a minute amount of coupling between the power tube plated and a transformer but since a capacitor is determined by surface area and proximity of the two surfaces, it makes a very poor capacitor. The effect would be so small it couldn't be measured.
PC boards get a bad rap in general. PC boards are not the "problem"; the problem is board layout. Some manufacturers design thier boards with long parallel traces that can capacitively couple; BUT...the same thing can happen with point to point wiring.
Re: Minimum Tube Spacing: 6V6 & 12AX7
Yeah true, I was mostly referring to the layouts.
Yeah true, I was mostly referring to the layouts.
