ORIGINAL MESSAGE:
On Tue, 19 Oct 2010 12:14:35 -0700, "knormoyle@surfnetusa.com"
<knormoyle@surfnetusa.com> wrote:
>
>The 50W versions need a larger mounting hole (1/4")
>which is doable, but I'd also need the 1/4"
>insulating hw.
REPLY:
I don't have an AL-1200 in front of me to see if this is feasible, but
here's a thought:
Install the two new zeners (50 watt) on a small piece of aluminum sheet
and mount the sheet directly in the airflow outlet of the fan or blower.
Bypass them well for RF and you can mount them at any reasonable
distance from the tube. Install bypass caps both at the zeners and at
the tube socket.
If you order one with the cathode to the stud and the other with the
anode to the stud you can dispense with the insulated mounting hardware
and bolt them directly to the aluminum. Then just "float" the aluminum
electrically on some standoff insulators.
This is what I did in my homebrew amp and the cooling is excellent.
The last time I checked, Newark carried the 1N33XX series of 50 watt
stud mount zeners, in both mounting polarities.
73, Bill W6WRT
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|