[AMRadio] WTB: National R-175 plate choke or equiv

Brett gazdzinski brett.gazdzinski at verizonbusiness.com
Thu Feb 22 08:24:56 EST 2007

The B+W 800 series chokes work well,
I have the 800 in my 2x813 rig that does 1.6
to 30 mc just fine.
The 800 series choke is just enameled wire close wound 
on a ceramic form that is about 5/8 inch round.

Later ones might have been wound on plastic forms.

They are still around cheap.

Any plate choke that will handle the current should work,
I never found one that caused problems as long as it did not arc
to ground or melt from the current.

>From looking in the junk box, it looks like some homebrewers
or companies mounted them to close to ground as I have a few
that show arcing.

Leave plenty of space to ground and all other parts.


> -----Original Message-----
> From: amradio-bounces at mailman.qth.net 
> [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Mark W1EOF
> Sent: Wednesday, February 21, 2007 10:55 PM
> To: Discussion of AM Radio in the Amateur Service
> Subject: [AMRadio] WTB: National R-175 plate choke or equiv
> I need a nice plate choke for my 813x2 amp. I was going to 
> homebrew one 
> now I'm thinking that there will be enough variables without 
> that. I'm 
> going for operation on all bands 160-10. So I'd rather use a 
> known good 
> design plate choke like the National R-175. Anybody got one 
> for sale or 
> trade?
> 73,
> Mark W1EOF
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