LinkBack Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #5   Report Post  
Old June 4th 05, 07:32 PM
Darrell
 
Posts: n/a
Default

Yes, there are diffences between the A and B versions. There are also
differences between various manufacturers. However, that doesn't change
the fact that the two tubes are generally interchangeable. All of the
hoopla got started when an article was written about some problems
Motorola had with some VHF gear that was designed around the 6146A and
had fixed neutralization. Their attempt to stadardize around the 6146B
caused them some problems.

The bottom line is, if it will neutralize, it will work fine. Frankly,
I've never found a piece of ham gear they won't work in. A partial list
of radios I have used them in with NO PROBLEMS:

COLLINS: KWM2A, 32S3A
GONSET: Commander
HEATHKIT: DX-60, DX100, HW-100, HW-101, Apache
JOHNSON: Ranger, Valiant, Viking II
KNIGHT: T-150
MULTI ELMAC: AF67, AF68
WRL: Globe Scout 680A

There are others. Like I said, I've never found an example where they
won't work, and work well. I haven't tried them on VHF equipment. I'll be
the first to admit that there could be a problem there.

Darrell






Darrell wrote:
Make sure that your replacement finals are 6146, or 6146A's, never

B's!




I've got to challenge this statement. This rumor has been circulating
for several years now. When I received my new HW-100 from Heathkit in
1968, it came with RCA 6146B's. There was a note enclosed that said
that they(Heath) were having problems getting 6146A's and that the
6146B's would work fine. They did. The radio neutralized without any
problems and stayed that way.


That there are big differences between the 6146(A), and the 6146B is
not a rumour. It shows up on the spec sheets as different
interelectrode capacitances. The 6146B had a bigger plate size, and
handled something like a third more plate dissipation.

It would have been better if I had said that you must use which ever
was certified by the manufacturer, straights, A's or B's.

Heath had already made the necessary modifications to the final
section of your radio. You would probably have had problems if you
tried A's.

The 6146B should have been issued a new number.

-Chuck




 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Good morning or good evening depending upon your location. I want to ask you the most important question of your life. Your joy or sorrow for all eternity depends upon your answer. The question is: Are you saved? It is not a question of how good [email protected] Antenna 0 April 25th 05 03:43 AM
Leece Neville value Programbo5 CB 56 January 1st 05 06:46 PM
More media bias George Shortwave 0 September 13th 04 03:00 PM
Question Pool vs Book Larnin' Mike Coslo Policy 24 July 22nd 04 05:50 AM


All times are GMT +1. The time now is 03:02 AM.

Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2025 RadioBanter.
The comments are property of their posters.
 

About Us

"It's about Radio"

 

Copyright © 2017