Neutralization

[KD2E]

Have you found the problem that causes the finals to go dead so often??
...Dave
----- Original Message -----
From: "Steve and Anne Ray" <sbralr at WORLDNET.ATT.NET>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Saturday, February 10, 2001 9:30 AM
Subject: Neutralization


> I have had my HW-101 steadily in use since I built it in 1976, over the
> years I have replaced the every 4 or 5 years, the first 6146 with 6146,
then
> 6146A and finally 6146B.  All of them lasted 4 or 5 years and the 6146A
> lasted about 7 years, I then replaced the 6146A since I had the final cage
> open to clean out some dust (arcing over).  I have had 6146B for about 4
> years now and going strong.
>
> I have found a pair 6146B can put out approx. 90 W on 10 meters and approx
> 125-130 watts on 80 meters.   To spare the power supply and tubes I never
> run them more then 100 W.
>
> I believe the secret of my success is that I neutralize the finals per the
> Heath Service Bulletin, (see KB9JJA web site
> http://members.accessus.net/~dwentz/kb9jja/heathkit/
> this involves peaking  the rig on 10 meters then shutting it down, waiting
> for the power supply capacitors to discharge and then disconnecting the
> screen and plate voltage and adjusting the neutralization capacitor, then
> firing up the rig again, without moving the tuning controls.   I found
that
> the neutralization (min rf voltage) was much better this way, then the way
> in the manual where you simply adjust for max output/min plate current.
> REMEMBER YOU ARE WORKING AROUND HIGH VOLTAGE AND IT CAN KILL.
>
> Good luck
>
> 73,
> Steve Ray K4JPN ex K1VKW
> HW-101, HW-8, Elecraft K2 1422
> HeathKit fan
> EM82fp
> Warner Robins GA
>
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