Quote:
Originally Posted by jeyurkon
Weren't the original ones that you need the amperite 17A470303? Vacuumtubesinc has two of them.
John
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Ah yes, so they do and almost twice what I paid for these
That's why I did the math to see if the '459 was a good substitute. According to my calculations (which have been confirmed by others), this tube is actually better. The two filament strings in the TS-4* chassis are not equal and 105 ohms is a bit too low when using modern line voltages anyway. I'd also noticed that my filaments were running a little hotter than they should.
Now, there a nice even glow with this ballast tube
That being said, I imagine the '303 Amperite glass tube is superior to the '303 JFD metal ballast tube. I'm curious if someone has used the '303 and has any thoughts on it?