[Heathkit] More on HW-101 Finals

[Edward B Richards]

Hi Glen;

It does not seem such a problem to me if neutralization is the only
problem. Why can't you put a bigger capacitor from the tank circuit to
the neutralizing capacitor. It is easy to get to. Do you have a suggested
value as a starter? Thank you.

73 from Ed Richards K6UUZ
Simi Valley, CA. Home of Air 
Force 1 pavilion

On Sat, 5 May 2007 19:31:23 -0700 (PDT) Glen Zook <gzook at yahoo.com>
writes:
> It has been my experience with the 6146B/8298A and the
> 6146W that they will work in "some" transmitters
> designed for the earlier versions.  I have worked on
> as many as 3 transmitters of identical design that
> have had serial numbers within 10 of each other.  The
> 6146B/8298A worked in 1 and the other 2 wouldn't even
> come close to neutralizing!
> 
> It is basically a "throw of the dice" if a certain
> transmitter will work with the later versions. 
> Component tolerances add up "differently" in each unit
> and that definitely can make a difference.  Even then
> one "run" of tubes may be slightly different and the
> next time one tries to use the 6146B/8298A the results
> may be different.
> 
> However, the "rule of thumb" is to use the 6146,
> 6146A/8298, or the 6293 in transmitters designed for
> the earlier versions if possible.  Yes, some
> transmitters work fine with the later versions.  Yes,
> some people haven't had any problems using the later
> versions.  But, the vast majority of transmitters are
> definitely not "happy" with the 6146B/8298A or the
> 6146W if they were originally designed for the 6146 or
> 6146A/8298.
> 
> Glen, K9STH
> 
> 
> --- "Kenneth G. Gordon" <kgordon2006 at verizon.net>
> wrote:
> 
> I have been using a pair of real 6146Bs (not the
> etched kind) in my HW-101 for the past year, and they
> have worked just fine, but I had to be extremely
> careful about the neutralization, both for the finals
> and for the driver. I used the remove-the-B+ method to
> neutralize the finals.
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Glen, K9STH
> 
> Website:  http://k9sth.com
> 
> 
>  
>
_________________________________________________________________________
___________
> TV dinner still cooling? 
> Check out "Tonight's Picks" on Yahoo! TV.
> http://tv.yahoo.com/
> _______________________________________________
> List Administrator: Duane Fischer, W8DBF        
> ** For Assistance: dfischer at usol.com **         
> $$ See the vintage area on the HCI web site - http://www.w9wze.org 
> $$ 
> Heathkit mailing list
> Heathkit at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/heathkit
> 
>