[R-390] 3TF7 Ballast Tubes

[Rick Popovich]

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 ?

I just had a 3TF7 go bad on my R-390 and don't have a spare. I DO have
plenty of 12BA6's. I would prefer to go that route as opposed to using
the resistor if no other mods are needed.

Tnx again to all.

Rick - WB6RMQ

Collins R-391
Motorola R-390
Capehart R-390A

-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net] On Behalf Of rbethman
Sent: Friday, February 18, 2011 2:31 PM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] 3TF7 Ballast Tubes

Joe - We all know what they are going for.  The price at Fair Radio is 
better than a bunch of others.

Ben - It is like I said, YMMV.  The 12BA6 is always and option, as is 
the resistor of ample wattage.

We all decide which "we" want to go.

Bob - N0DGN

On 2/18/2011 5:27 PM, Ben Loper wrote:
> I may go ahead and buy these
>
> -----Original Message-----
> From: Joe Connor [mailto:joeconnor53 at yahoo.com]
> Sent: Friday, February 18, 2011 4:25 PM
> To: Ben Loper; rbethman
> Cc: r-390 at mailman.qth.net
> Subject: Re: [R-390] 3TF7 Ballast Tubes
>
>
> For the record, 3TF7s are going for $50 apiece at Fair Radio.
>
>                          Joe Connor

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