[R-390] 12BW4 mod

[Tom Bridgers]

After completing the 12BW4 mod (substituting for the 26Z5s) this weekend and
plugging them in, I realized that the 12BW4 is substantially taller than the
26Z5.  So much taller, I'm not sure I can put the bottom cover on without it
hitting the top of the 12BW4s.  Anyone else observed this, or do I have a
pair of 12BW4s on steroids?
By the way, the 12BW4s work great.  Hello 12BW4s; goodbye 26Z5s.
Thanks,
-Tom

----- Original Message ----- 
From: <r-390-request at mailman.qth.net>
To: <r-390 at mailman.qth.net>
Sent: Wednesday, December 22, 2004 4:01 AM
Subject: R-390 Digest, Vol 8, Issue 18


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> Today's Topics:
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>    1. 6tf4 Ballast (Steve Hobensack)
>    2. Re: 6tf4 Ballast (Roy Morgan)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 21 Dec 2004 07:59:12 -0500
> From: "Steve Hobensack" <stevehobensack at hotmail.com>
> Subject: [R-390] 6tf4 Ballast
> To: r390a at bellsouth.net
> Cc: R-390 at mailman.qth.net
> Message-ID: <BAY17-F318E6DD7756C7B7DA329AACAA30 at phx.gbl>
> Content-Type: text/plain; format=flowed
>
> Tom, a rule of thumb for ballast tube nomenclature: The first number
usually
> means the current in milliamps the ballast tube will hold. The number at
the
> end usually indicates the "head voltage" required for regulation. As in
the
> 6tf4 , it will hold 600 mills of current and you need at least 4 volts
over
> and beyond the tube voltage for minimum holding of current. 4 volts is at
> the edge of hold , ideal voltage would be a few more volts above 4 volts
> more than tube filament voltage. This may be explained at the  amperite
web
> page. I don't know the web address offhand.
>
> 73....Steve...n8ye
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 21 Dec 2004 11:48:02 -0500
> From: Roy Morgan <roy.morgan at nist.gov>
> Subject: Re: [R-390] 6tf4 Ballast
> To: "Steve Hobensack" <stevehobensack at hotmail.com>,
> r390a at bellsouth.net
> Cc: R-390 at mailman.qth.net
> Message-ID: <6.0.0.22.2.20041221113721.03a28330 at mailserver.nist.gov>
> Content-Type: text/plain; charset="us-ascii"; format=flowed
>
> At 07:59 AM 12/21/2004, Steve Hobensack wrote:
> >Tom, a rule of thumb for ballast tube nomenclature: The first number
> >usually means the current in milliamps the ballast tube will hold.
>
> In hundreds of milliamps
>
> >  ..This may be explained at the  amperite web page. I don't know the web
> > address offhand.
>
> I have a PDF version of the Amperite info on Ballasts and will email it to
> anyone who wants it.
>
> The direct link to it is:
> http://www.amperite.com/Uploads/Ballasts.pdf
>
> Note: do not be enthused if you find your favorite number in their list of
> ballast tubes still available.  Some time ago a quote from them about the
> 3TF7 was in the order of $115.00 each with a minimum order of 50 or a
hundred.
>
> Roy
>
> - Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
> 7130 Panorama Drive, Derwood MD 20855
> Home: 301-330-8828 Cell 301-928-7794
> Work: Voice: 301-975-3254,  Fax: 301-948-6213
> roy.morgan at nist.gov --
>
>
>
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> End of R-390 Digest, Vol 8, Issue 18
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