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R390-A Ballast tube




 
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Author Topic: R390-A Ballast tube  (Read 4072 times)
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WZ1M
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« on: January 16, 2009, 04:11:32 PM »

OK, here goes. Is the 3TF7 the same as the TJ311M01 ballast tube. I did do a Google and yes, it is or is it? I had someone tell me that it was not.
Let the frenzy begin.......
Regards,
Gary...WZ1M
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W7SOE
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« Reply #1 on: January 16, 2009, 06:15:34 PM »

It is my understanding that they are equivalent.

I hope so, I am running a TJ311M01 in my r-390a!

Rich

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WV Hoopie
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« Reply #2 on: January 16, 2009, 06:23:11 PM »

Gary,

I guess if the R-390/A is to be put on a pedestal, never to be plugged in, a complete restoration; then it might matter. Doubt of many of these great receivers are in the back of a deuce and a half, towing a generator, over hill and dale where the ballast tube would make a difference.

For many of us who use one daily, pull the ballast toob, replace the PTO & BFO toobs with 12BA6's, and jumper pins 2&7 of the ballast toob socket. Save $30 to $40 on a toob that doesn't last very long.

But yes, I've heard that the TJ311M01 could be a replacement.

73's
wd8kdg
Craig
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kc2ifr
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« Reply #3 on: January 16, 2009, 06:37:32 PM »

Just a quick note for those who want to buy the correct toob....
This guy has them from time to time along with complete toob sets for various receivers......check him out..
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=390011358649

Bill
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w3jn
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« Reply #4 on: January 16, 2009, 09:51:21 PM »

Gary,

I guess if the R-390/A is to be put on a pedestal, never to be plugged in, a complete restoration; then it might matter. Doubt of many of these great receivers are in the back of a deuce and a half, towing a generator, over hill and dale where the ballast tube would make a difference.

For many of us who use one daily, pull the ballast toob, replace the PTO & BFO toobs with 12BA6's, and jumper pins 2&7 of the ballast toob socket. Save $30 to $40 on a toob that doesn't last very long.

But yes, I've heard that the TJ311M01 could be a replacement.

73's
wd8kdg
Craig

Agree 100%.  The best solution by far.

The 3TF7 has no value added when using normal residential power.
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