unused PT filament windings?

mike_mccue · 10-14-2009, 03:45 PM

I'm looking at the Hammond Transformer listings and it seems most of the time I see a suitable voltage and current capacity for the power tubes that the transformer also has 5vAC heater leads.

It seems that there aren't many suitable B+ with 6.3vAC choices that do not also include 5vAC.

That's great if you are running a tube rectifier.

What do you do if you want to assemble a bridge rectifier out of diodes?

Do you just terminate or find a use for the 5vAC leads? Shrink wrap? A Pilot light?

thanks,
mike

Old Tele man · 10-14-2009, 03:50 PM

...ALL unused windings should be taped/insulated and otherwise left alone.

tubeswell · 10-14-2009, 04:05 PM

Yep I put a couple of layers of heat-shrink overlapping the bare end of each unwanted wire, and tuck the ends away somewhere where they ain't going to cause grief (but keep the wires there for a rainy day).

mike_mccue · 10-14-2009, 04:47 PM

thanks.

Enzo · 10-15-2009, 12:53 AM

Personally, I prefer to have the unused wires terminate on a terminal strip. But that is just another way of keeping them out of the way of everything else as suggested above.

Diablo · 10-15-2009, 03:22 AM

How about using plastic insulated twist connector nuts. One for each wire.

Old Tele man · 10-15-2009, 03:30 AM

Quote:

Originally Posted by Diablo

How about using plastic insulated twist connector nuts. One for each wire.

...unless those "house electrician twist nuts" are firmly tied-down somewhere, they'll "rattle" like mad inside a chassis when vibrated.

...shrink tubing and tie-wraps work well.

Enzo · 10-15-2009, 03:40 AM

The bottom line is this, no matter how you do it, you want the wires secure, and unable to touch something else electrically. The transformer itself doesn;t care at all whether you actually use the winding or not.

10-14-2009, 03:45 PM	#1
mike_mccue Senior Member Join Date: Aug 2007 Posts: 192	unused PT filament windings? I'm looking at the Hammond Transformer listings and it seems most of the time I see a suitable voltage and current capacity for the power tubes that the transformer also has 5vAC heater leads. It seems that there aren't many suitable B+ with 6.3vAC choices that do not also include 5vAC. That's great if you are running a tube rectifier. What do you do if you want to assemble a bridge rectifier out of diodes? Do you just terminate or find a use for the 5vAC leads? Shrink wrap? A Pilot light? thanks, mike Last edited by mike_mccue; 10-14-2009 at 04:47 PM.

10-14-2009, 03:50 PM	#2
Old Tele man Senior Member Join Date: Oct 2007 Location: Tucson, AZ Posts: 431	...ALL unused windings should be taped/insulated and otherwise left alone. __________________ ...and the Devil said: "...yes, but it's a DRY* heat!"*

10-14-2009, 04:05 PM	#3
tubeswell Supporting Member Join Date: Feb 2007 Location: Wellington NZ Posts: 2,662	Yep I put a couple of layers of heat-shrink overlapping the bare end of each unwanted wire, and tuck the ends away somewhere where they ain't going to cause grief (but keep the wires there for a rainy day). __________________ Building a better world (one tube amp at a time)

10-15-2009, 12:53 AM	#5
Enzo Senior Member Join Date: May 2006 Location: Lansing, Michigan, USA Posts: 10,366	Personally, I prefer to have the unused wires terminate on a terminal strip. But that is just another way of keeping them out of the way of everything else as suggested above. __________________ Education is what you're left with after you have forgotten what you have learned.

10-15-2009, 03:40 AM	#8
Enzo Senior Member Join Date: May 2006 Location: Lansing, Michigan, USA Posts: 10,366	The bottom line is this, no matter how you do it, you want the wires secure, and unable to touch something else electrically. The transformer itself doesn;t care at all whether you actually use the winding or not. __________________ Education is what you're left with after you have forgotten what you have learned.

10-14-2009, 04:47 PM	#4
mike_mccue Senior Member Join Date: Aug 2007 Posts: 192	thanks.

10-15-2009, 03:22 AM	#6
Diablo Senior Member Join Date: Dec 2007 Posts: 505	How about using plastic insulated twist connector nuts. One for each wire.

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