[R-390] Ballast App Note

[sigmapert]

here a link to an article dealing with the comparison of the original 3TF7 and a SS
replacement of the 3TF7:

a) http://www.radiomuseum.org/forum/ballast_tubes_in_filament_regulation_of_vfo_tubes.html

At the end of the above contribution you'll find another reference:

b) Schmid, Kurt, 4H4C Ballast Tube Replacements, Electric Radio 264: 40 (2011)

c) A solid state replacement for the 3TF7 current regulatorof the R-390 and R-390A
receiver:

http://schmid-mainz.de/Flyer.pdf

sigmapert

mailto:sigmapert at gmx.de



> Probably no new information to the list here, but fwiw,

> I came across this by googling; it does not seem accessible from the
> Amperite homepage:
> http://www.amperite.com/assets/Documents/Ballasts.pdf

> At least one person has done a solid state replacement:
> http://www.radiomuseum.org/tubes/tube_3tf7.html

> JPW
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