Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: dude on February 26, 2021, 12:08:39 pm
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I asked this question a while back but never got a solution.
Both tag boards below are 1/8" thick and too flexible to use alone. I want to run the high voltage wiring under both boards sandwiched together, as both together gives the bds strength not to sag. The eyelets are small, I don't want to take the chance of solder flowing under the bds so I want them tight.
I duck taped the HV wires and now after 5 months I'm ready to populate the bd but the duct tape is coming loose. Any suggestions to keep the wire under the bds tight against the back? I don't want the wire to sag and possible get hung up pushing wire under the bd to pots or tubes.
Suggestions months ago were, don't use the bd., let the gap be. Just need a good clean way to keep the HV wire tight against the backer bd. Hot glue gun..?
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If you using stranded wire, maybe solid will sag less...
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It’s 22 gauge solid cloth pushback. Not really sagging, maybe I’m out to lunch. No issues just let them be...?
Would a small dab of hot glue be ok, just to protect them from coming loose.
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I searched, under bd, between or over. Six to one, half a dozen to the other. Most results say don’t run between bds, solder may flow between, although this wiring was common with Leo.
I’ll just use a little heat shrink on the ends and run the HV wire under the boards. I could also drill a hole next to the eyelet that takes the HV wire and feed it up the hole and into the eyelet. This should help with location of under the bd wire, also give some extra support.
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Maybe I'm weird, but running wires in hidden locations sounds like a bad idea to me.
Why can't it run on the surface that you see?
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PPR, that’s a good point but not much input here but you, thanks.
It’s makes a neater clean looking bd to run under. Tell me if I’m wrong, Doug’s work here showing turret boards, has lacing on top, most are grounds but short runs are hot and l’m sure there are some boards he populated that run the HV under the bd up and over the turret...? Maybe, l got that wrong with Doug’s work. Seems no one wants to discuss this..? I just don’t like the idea of HV wire pushed against say a ground wire but this is done in a lot of builds
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Seems no one wants to discuss this..?
Maybe because we recently covered it. Go back and read your original thread.
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No offense but asked twice cause l got the same answers as now.. :icon_biggrin:
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OK, I'll bite.
I think running the wires between the boards (a wire sandwich!) is not wise. I suppose you could use some short nylon standoffs to provide some space in between the boards, but I don't see the point. By running the wires in between two boards, you make it really difficult to make changes to your circuit later.
If the boards are not "stiff enough," then simply provide more standoffs between the board and the chassis to provide more rigidity.
As for sagging wires, I personally use solid core wire in this situation, and they generally stay in place nicely. In addition, I will use non-conductive rubber to tack long wires to the board -- Permatex works well in this situation (but is potentially messy) -- though honestly it really makes no difference.
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acheld, thanks for your take. I think l probably asked a dumb question. There are several ways to populate a bd, wires on top or under, even sandwiched between as Fender did with fiber bds. Many BF Fenders still working today. Your suggestion is pretty much what l planned to do, just duct tape probably isn’t the best way to keep wires flat. Couple of tack points as you mentioned, hot glue or the like, maybe nothing. Next time I’ll think twice before posting, guess Covid restrictions might be getting to me. :laugh:
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Your question was/is legitimate.
Always good to think twice before posting -- am I making my question clear to the forum, providing enough (but not too much) detail, context, and schematics and/or pictures as appropriate? But don't hesitate to ask when needed. There are a lot of very talented folk on this forum who are generous with their time. And the questions and their answers are what make this site very special.
Covid has been awful. The reality is bad, and the restrictions are affecting all of us. My next door neighbor's wife just died from it -- really brings it home.
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Your question was/is legitimate. Covid has been awful. The reality is bad, and the restrictions are affecting all of us. My next door neighbor's wife just died from it -- really brings it home.
Sorry to hear about your neighbor, and thanks for the uplift regarding my question on this forum, sometimes I think the forum has had enough of me... :icon_biggrin: