[R-390] 3TF7 Ballast Tubes

[Ben Loper]

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

--- On Fri, 2/18/11, rbethman <rbethman at comcast.net> wrote:

> From: rbethman <rbethman at comcast.net>
> Subject: Re: [R-390] 3TF7 Ballast Tubes
> To: "Ben Loper" <brloper at gmail.com>
> Cc: r-390 at mailman.qth.net
> Date: Friday, February 18, 2011, 9:43 PM
> Ben,
> 
> There is not a "collective" viewpoint regarding these.
> 
> My view is *IF* you can get them, and don't have to give up an "arm 
> and a Leg" to get them, then I'd stick with the 3TF7s.
> 
> The other possible method would be to place a 40 to 50 ohm
> 10 Watt
> resistor in its place.
> 
> I haven't gone the route of using a 12BA6 as of yet.
> 
> The resistor came in my '67 EAC, and worked just
> fine.  Currently I have
> one NOS 3TF7 left that is going into my St. J's restoration
> of the first 
> contract Collins.
> 
> As is true in just about all instances, YMMV!
> 
> Bob - N0DGN
> 
> On 2/18/2011 4:35 PM, Ben Loper wrote:
> >
> > I came across some NOS 3TF7 Amperite tubes.
> Should I make an offer on them
> > or is the conventional wisdom to replace them with a
> 12BA6 tube.
> 
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