Globe 350 Re: [AMRadio] 4-65's


crawfish crawfish at surfmore.net
Thu Apr 5 22:06:34 EDT 2007


Dr. John is now KN4ME. I don't think he is very active.
                                                                  Joe W4AAB
----- Original Message -----
From: "Jim Candela" <jcandela at prodigy.net>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Thursday, April 05, 2007 8:36 PM
Subject: Re: Globe 350 Re: [AMRadio] 4-65's


>
>
> Bob,
>
>    I tried those 4-65's because I had them at the time. I got the B+ up by
making the same power supply filter capacitor input instead of choke input.
The power tranny protested by getting hot quickly, so this approach was not
for 'old buzzard transmissions'. I switched out the 809's for a pair of
808's and added a 7.5 VCT @ 8a filament transformer. I recall beefing up the
6AQ5 audio driver to something like a 6V6.
>   The AX9909's are indirectly heated, and take 12 volts whereas the 4-65
are directly heated, and take 6 volts.An external 6v filament tranny with a
CT would have been better, or I suppose you could use DC and make a balanced
center with 100 ohm resistors.
>   That rig went on to Dr. John in Arkansas (WB5NTO). I heard he ended up
in Florence Alabama with a new call. As for that rig, I wonder whatever
became of it.
> Another worthy option is a single 7094, or maybe two. Hoisy Hoisington,
W4CJL, Founder of SPAM,  used a single 7094 in his Globe Champ.
>
> Regards,
> Jim
>
>
>
>
> ----- Original Message ----
> From: RJ Mattson <rjmattson at hvi.net>
> To: Discussion of AM Radio in the Amateur Service
<amradio at mailman.qth.net>
> Sent: Thursday, April 5, 2007 7:46:10 PM
> Subject: Globe 350 Re: [AMRadio] 4-65's
>
> Hi Jim
> I am always looking for substitutes for my Champs AX9909's.
> The top of the list are two 5894's with the plates wired in parallel. I
> believe there was a article in ER with is conversion?
> How did you get the HV up to 1500v?
> Would an additional fil xmfr resolve cathode modulation or could a DC fil
> ckt and cap decoupling be the solution?
> I have a stock of both 4-65s and 5894/7854s
> bob...w2ami
>
>
>
>
>
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