[R-390] 3TF7 Ballast Tubes

[Manfred Antar]

At 04:42 PM 2/18/2011, Tom Frobase wrote:

>You replace the 2 tubes that are in series with the Ballast V505 and 
>V701 with 12BA6's and put a jumper between pins 2 and 7 on the ballast 
>socket.  tom, N3LLL
>
>
>On 2/18/2011 5:58 PM, Rick Popovich wrote:
>> This is why I joined this list - I'm always learning something new.
>>
>> Which leads to my question; is the 12BA6 a DIRECT substitute for the
>> 3TF7 ? - meaning no wiring changes are needed under the tube socket ?

There is a guy in Germany that makes a solid state replacement that fits in the 3TF7 socket
I use one in one of my R390A's and have ordered another one for the other R-390A
They work great
The cost is $72.50 plus postage from germany.
He also builds new filer caps for the AF deck that are real nice

Here is the web address:

http://www.sigma-tec.eu/cartview.php?id=16



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