[Boatanchors] 6146 folklore

[john]

You can NEVER have too many 6146's!!!

Yours in immoderation
John
K5MO


At 06:51 PM 7/14/04 -0600, Ray Friess wrote:
>
>Gee... i didnt know I'd be opening up such a hornets nest by asking my 
>question.  HI HI>
>I just wanted to know if maybe I had TOO MANY 6146w tubes in stock (85) 
>or if I could use em in my
>Apache, DX 100 and dx 40....    also have a dx 60 I'm restoring..
>   Ray  wa7itz
>
>
>Glen Zook wrote:
>
>>And I have seen just the opposite!  Many rigs that
>>don't like the 6146B and a relative few that do like
>>it!
>>
>>That is why I say to watch the neutralization (if the
>>rig has that capability).  If the rig neutralizes OK,
>>and if it holds the neutralization, then certainly go
>>ahead and use the "B" and "W" series.  But, if any
>>instability happens, then go back to the earlier
>>tubes.
>>
>>In addition, you really should use some type of
>>wavemeter (or GDO in the wavemeter position) to search
>>for VHF parasitics if you use the "B" series tubes in
>>place of the earlier versions.  You might be very
>>unpleasantly surprised at the spurious emissions that
>>the "B" series is putting out!  Unfortunately, the "B"
>>series is much more prone to the generation of
>>spurious emissions especially in the VHF range.  Often
>>that doesn't really show up readily on the meter
>>readings!
>>
>>Also, although not in amateur service, but in
>>commercial service, replacing the 12 volt equivalent
>>of the 6146 / 6146A (6883 / 6883A / 8032) with the
>>6883B / 8032A / 8552 (12 volt equivalent of the 6146B
>>/ 8298A) in the Motorola Motrac series you WILL have
>>problems and problems in a hurry in those rigs that
>>were not designed for the "B" series tubes.
>>
>>Again, Collins had to redesign the neutralization
>>circuitry in the S-Line and KWM-2 series so that the
>>"B" series tubes could be used.  Without the
>>modification at least 9 out of 10 units had serious
>>problems!  That, I believe, in itself shows the
>>problems that can happen with the "B" series!
>>
>>As I have said before, many amateurs have not had any
>>problems using the "B" series in place of the earlier
>>versions.  But, many many more amateurs have
>>definitely had problems.  As such, I seriously caution
>>anyone who uses the "B" series in place of the earlier
>>versions to proceed with caution.  If the "B" series
>>works properly in their equipment, then that is fine. 
>>But, if the "B" series doesn't work properly, then
>>they are in for a lot of problems (including damage to
>>the equipment) if they persist on using the "B" series
>>tubes.
>>
>>There is no shortage of the earlier versions of the
>>6146 family although the "W" versions are sometimes a
>>"bit" cheaper and the fact that most of these are the
>>"B" equivalent does cause some concern.  However, if
>>the purchaser of the "W" types knows what to look for,
>>and if they have problems with the "W" types go back
>>to the earlier versions, then they will not damage
>>their equipment, put out spurious emissions, etc.
>>
>>However, the problems with using the "B" series tubes
>>is NOT an "old wives' tale"!  It is a real situation
>>that requires attention to be paid by those who are
>>trying to substitute tubes.  Sometimes they work fine.
>> But, many times they don't!
>>
>>Glen, K9STH
>>
>>
>>--- john <johnmb at nc.rr.com> wrote:
>>
>>I've heard this story about 6146B/Ws over and over,
>>yet my first hand experience bears it out only in one
>>rig, that being a single HW101.
>>
>>=====
>>Glen, K9STH
>>
>>Web sites
>>
>>http://home.comcast.net/~k9sth
>>http://home.comcast.net/~zcomco
>>
>>
>>		
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>>
>>
>>
>>  
>>
>
>
>
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