Henry 2K Filament Transformer help

[KI4NR]

Hi all

I am working on a Henry 1963  2K Amp with two 3-400Z tubes. After diagnosing the problem I need a filament transformer, the primary winding is shorted. Does anyone know were I can get one or have one laying around.

thanks John KI4NR

[WBear2GCR]

Afaik, there is no separate filament transformer.

At least on my 2K-3 and 2KD the filaments are wound on the main HV transformer.
Thus a problem if you have to replace the HV transformer - as I do because it is fried.
That means adding in someplace a filament xfmr.

Regardless, if your model actually has a separate fil transformer (got a jpeg of that PS??) then you want a 10v tranny, since the fils are wired in series.

You could rewire the guts for parallel operation, and use one or two fil xfmrs, but that requires changing the filament choke also... keep in mind the downside of the rig is that it can't be run with just one tube in the hole.

Also, it was designed for 3-400 or later 3-500z tubes.
The 4-400 ought to work, I am told (all the 4-400s that I had when I was working on the linears were broadcast pulls and turned out to be NG/shorted/gassy.    ) but I think it draws slightly more quiescent current sitting around...

        _-_-WBear2GCR

[KI4NR]

This is a very old henry 2K and their IS a separate filament transformer on this floor model. It's 5.5 volt at 30 amps ... here's the pic. This is the first amp henry made. Check out this website.

73 john


http://www.radiodan.com/Henry/misc/2K1.htm

[WBear2GCR]

Wow!

kewl, in the RF deck, eh?

Well, I assume you pulled the secondary wires and tested it?
Just checking...

So, what did they do on the filament choke set up?

Anyhow, I guess one can find 5v 30amp (do they draw that much?) filament iron.

There is at least one Amfone participant who specializes in rewinding iron too...
not sure who it is, but Todd KA1KAQ or Bruce W1UJR it seems to me had something rewound not to long ago with a thread on here...

           _-_-WBear2GCR

[WBear2GCR]

2nd thought - depending on the nature of the fault - you might want to pull the iron out and inspect the construction of the windings. If the primary has shorted windings and the secondary does not, AND the primary is wound on top of the secondary, then it shouldn't be terribly difficult to pull the windings off the lams and rewind the outer primary layer! 

                 _-_-bear

[KI4NR]

It has a B&W filament choke. The primarys are shorted on the Xformer.

john

[KI4NR]

It's for a customer and I rather not bother to rewind it. I just want to replace it and he has the money, just looking for a source to get one. Peter Dahl has one but at 165 dollars is to much. Ameritron has a separate transformer in their AL-82  that might have possibilities.

[Joe Long]

Try Hammond 167X5. 5V/30A.  Price is better than the rest.  Joe

[KI4NR]

Yep ......I was just looking at that one . RF parts has it and Newark too ....around 50 dollars. Thats the ticket, will fit perfectly with room to spare.

thanks john