[Heathkit] SB-220

[Paul Baldock]

Remove the caps and chokes and ground the grids directly. Will give 
you about 1dB more gain.

Don't believe what some people tell you about negative feedback. It's 
been disproved.

- Paul KW7Y



At 07:49 PM 1/31/2014, KA9EGW wrote:
>So here's this SB-221 [which probably should be called an "SB-211" in it's
>post-CBer butchered form.] that I am turning into a proper SB220 via input-
>and output-network implants and unbutchering of the other stuff..  Something
>I don't get, is what's the point of having 3x220pf and 1mH at each grid to
>ground?  If they should be grounded for both RF through the 660pF and for DC
>through the 1mH, why not just ground them directly with some strapping or
>braid?  One of the 1mH's grenaded at some point in this amp's life.
>
>73, Brian KA9EGW
>
>______________________________________________________________
>Heathkit mailing list
>Home: http://mailman.qth.net/mailman/listinfo/heathkit
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:Heathkit at mailman.qth.net
>
>List Administrator: Duane Fischer, W8DBF
>** For Assistance: dfischer at usol.com **
>
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html