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kf4tdv
11-10-2005, 07:45 PM
can anyone tell me how to neutalize for new tubes?

thank,
cameron
kf4tdv

WB2WIK
11-10-2005, 08:12 PM
The instructions are in the SB-102 manual, and they're very well written with pictograms and everything.

If you don't have the SB-102 manual, by all means, buy a copy -- well worth the small investment.

http://www.manualman.com/catalog/heathkit.htm

Has SB-102 assembly and operating manual for $35.

WB2WIK/6

KL7AJ
11-10-2005, 08:22 PM
Quote[/b] (kf4tdv @ Nov. 10 2005,12:45)]can anyone tell me how to neutalize for new tubes?

thank,
cameron
kf4tdv
You need to neutralize the DRIVER as well as the finals, by the way. And yes...go by (buy) the book http://www.qrz.com/iB_html/non-cgi/emoticons/smile.gif


eric

K9STH
11-10-2005, 09:27 PM
Being that I am a firm believer in the principles of the conservation of my finances and energy, when I need a manual for a "boat anchor" I generally check Ken Grimm's BAMA. The mirror site is generally better because it has 5 times the download slots of the main site.

The entire SB-102 manual is available for free from the following URL:

ftp://bama.edebris.com/bama/heath/sb102/sb102gif_v6.pdf

It is an 11 MB file so it will take a while to download. The schematic and a few other items are available as separate downloads.

The URL of the main site is http://bama.sbc.edu and the "home" page of the mirror is http://bama.edebris.com/manuals/

Glen, K9STH

K9STH
11-10-2005, 09:31 PM
By the way, do NOT use 6146B, 8298A, or 6146W tubes in the SB-102. Those tubes are different from the "regular" 6146 / 6146A / 8298 tubes and at least 9 times out of 10 they will cause problems in the SB-102 including neutralization.

For the article on the 6146 family of tubes that appeared in Electric Radio a while back go to

http://home.comcast.net/~zcomco

or

http://home.comcast.net/~k9sth

There is much more information on the 6146 family than can be put in a post to a thread.

Glen, K9STH

kf4tdv
11-15-2005, 04:28 PM
thanks glen
glad to know when i need help they're is someone willing to help instead telling me to go buy a manual

thanks again
cameron
kf4tdv

W0LPQ
11-15-2005, 05:33 PM
Cameron, whether one has to buy, beg or download a manual is moot.

The point is ... you need a manual to work on the 102, or for that matter any radio.

There is nothing wrong with someone telling you to buy a manual, however, if you can find one for download, so much the better.

Bill, W0LPQ

WA2ZDY
11-15-2005, 06:10 PM
Knowng the answers is not the important thing; knowing where to find them is. And the answers are all in the manual.

I have a substantial collection of manuals for nearly every piece of equipment I have here. I use exclusively Motorola equipment except on HF. If you think Motorola rigs are expensive, try the price of the books!

That was not "un-helpful" advice you got; as Bill says, you NEED the book. And Heathkit books were usually VERY good ones.

WB2WIK
11-15-2005, 06:11 PM
Quote[/b] (W0LPQ @ Nov. 15 2005,10:33)]Cameron, whether one has to buy, beg or download a manual is moot.

The point is ... you need a manual to work on the 102, or for that matter any radio.

There is nothing wrong with someone telling you to buy a manual, however, if you can find one for download, so much the better.

Bill, W0LPQ
BAMA is a nice service, but I very infrequently use their downloads:

-Painstakingly slow (including the "debris" site)
-Most manuals are missing pages -- especially the very long manuals
-The manuals are scanned using various quality and resolution tools, but many are practically unreadable, especially schematic component details

I'd *much* rather pay for a real manual. For me to download a 100+ page manual from BAMA and then print it for future reference and make this financially viable as compared with simply buying the manual makes my "value per hour" something really, really small. I can't afford to work, even in my spare time, for minimum wage....

I appreciate the service and refer others to it often, but I find it nearly unusable.

WB2WIK/6

K9STH
11-15-2005, 08:57 PM
Ken Grimm, K4XL, is gradually getting the quality of the manuals on BAMA upgraded. He also has abandoned the DJVU format and is now putting up most new stuff in Adobe PDF and is going back and converting manuals as fast as possible to PDF.

I have nothing against purchasing either a new or a reprinted manual. In fact, the person who does most of the copying at W7FG (Kent, K9JCR) has been a friend of mine for over 45 years (used to work him on 2 meter AM when I was in high school). I have a number of those manuals as well as originals and downloads from BAMA.

But, since I am definitely a beliver in the principles of the conservation of my finances and labor (you can read "cheap and lazy") I do look for sites that I can download information.

K4XL has gotten permission to publish the older Sams Photofacts folders. There are Sams on all sorts of older receivers and converters including some pretty rare units. He is putting all of those up in PDF format.

Since I do download manuals from BAMA to service equipment for others I feel obligated to upload manuals on equipment that Ken does not have the information. This is especially true for items that are relatively scarce and you will find several manuals on the site that I have uploaded.

Anyway, the quality of manuals on BAMA is steadily improving. Considering the cost to the user I think that the service is excellent and is improving every day.

Glen, K9STH

W2VW
11-15-2005, 09:01 PM
Meanwhile check if your maximum power output happens at the same place in plate tuning as the dip in cathode current.
If the 2 are close then it is neutralized.

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