[R-390] 12BW4 mod

[Kurt]

Tom
I have done this mod and they do fit. Just barely. Find two tall tube 
shields. This will give you some peace of mind and protect the tubes from 
the bottom cover. The 12BW4's work great.
Kurt Holbrook
----- Original Message ----- 
From: "Tom Bridgers" <Tarheel6 at msn.com>
To: <r-390 at mailman.qth.net>
Sent: Monday, February 14, 2005 9:59 AM
Subject: [R-390] 12BW4 mod


> 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:
>>
>>    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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