Hank,
My old Elmer, Eric, WB4VVI (SK), was adamant about running 5KV on a pair
of 813's. I asked him how would they survive. He said they were good to 2500
VDC in AM, hence your voltage swing with modulation would be 5KV. Therefore,
5KV on a pair of 813's in SSB was easily, (his claim, not mine!) obtained.
My only problem is you have to be extremely careful while tuning up. One
slight mis-match and your 813's are toast! We were working together on
making such an amplifier but he went SK before we could take it from the
drawing board and apply it.
Mike(y)
W3SLK
----- Original Message -----
From: <N6BUU@aol.com>
To: <jono@enteract.com>; <kb8gnf@orwell.net>; <amps@contesting.com>
Sent: Thursday, May 18, 2000 12:40 PM
Subject: Re: [AMPS] 4-1000 is this a good tube?+
>
> In a message dated 05/17/2000 11:40:08 PM Pacific Daylight Time,
> jono@enteract.com writes:
>
> <<
> Rich suggested 7.5 KV. Personally I think that's a little to high since
the
> maximum rating is 7 KV if memory serves me. Of course if all you are
going
> to do is run SSB, 7.5 KV is probably OK. But if you are going to run AM
or
> RTTY or even high speed CW, I would feel uncomfortable running my plate
> voltage that high.
>
> 73,
>
> Jon
> NA9D >>
> the above comments reminded me of a fellow I ran into on 40 mtrs a few
years
> back he was running 5KV ON A PAIR OF 813s! i wondered, but forgot to asked
> him what his idle current was, as the (2) 813 give only 250 w of plt.
dissp.
> anybody here had any experience running 813s at this voltage?? (seems just
a
> tad high to me!)
>
> HANK
>
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