6146's - One More Time

[Dave Hockaday]

>OK, I know this has been hashed over a few times, but which version of the
>6146 would be best for 6M use? I'm looking at replacing the 6146's in a
>Heath SB-110. It has -A's in it now...I believe they're the originals.
>Would it really make any noticable difference? -A's and -W's seem to be
>cheaper than the -B's. I'm not really concerned about getting the last
>milliwatt of performance, I just want something that will work.

HI Mark. I don't remember which publication I read this in a few years ago,
but the -A version is better for VHF operation due to interelectrode
capacitances. I've proven this out in my Heathkit SB-500 2 meter
transverter. It uses a pair of 6146's in the PA. I've tried the -A, -B, and
-W's. The only tubes that would neutralize properly were the -A's. I tried
several pairs of the -B's and -W's, and both of my pairs of -A's were just
fine. The other's were a bear to neutralize and never did work quite right.

73!
Dave WB4IUY
wb4iuy at ipass.net
http://www.ipass.net/~wb4iuy