[Heathkit] 6146Bs

[Glen Zook]

Generally, the only thing that has to be considered when using the earlier tubes in place of the 6146B/8298A is that you can't run as much power.  The 6146 and 6146A/8298 is rated at 90-watts input CW, 85-watts input SSB, and 67.5-watts input AM.  The 6146B/8298A is rated at 120-watts input CW, 120-watts input SSB, and 90-watts input AM.  

The result is that one should get 75% output on CW and 70% output on SSB when using the earlier tubes so not to run them in excess.

The neutralization problems that happen when the 6146B/8298A is used in transmitters designed for the earlier tubes do not generally happen when the earlier tubes are used in transmitters designed for the later tubes.  Basically, the earlier tubes neutralize easier than the later ones.
 
Glen, K9STH


Website:  http://k9sth.com


________________________________
 From: William Houghton <rdrbill at pacbell.net>
To: Glen Zook <gzook at yahoo.com>; "heathkit at mailman.qth.net" <heathkit at mailman.qth.net> 
Sent: Saturday, March 23, 2013 2:42 PM
Subject: Re: [Heathkit] 6146Bs
 
Glen,

Now we know to avoid using 6146B's in a circuit designed for 6146 or 6146A 
tubes. How about the other way around - have htere been any issues using a 6146 
or a 6146A in a circuit designed for either a 6146B or an S2001A?