Jim,
How is the 'next amp' going to be used?
Steve, NR4M
On 8/25/2023 9:19 AM, jim.thom jim.thom@telus.net wrote:
17 x pix of the 10 kw 6M amp...using the new Pentalab 3CX-6000A7 tube. If
you want to see pix of both top + bottom of the RF deck, + pix of the HV
supply, here is the link.
https://amprepairguy.com/10kw-6-meter-custom-pa-3cx6000a7...
<https://amprepairguy.com/10kw-6-meter-custom-pa-3cx6000a7.html?fbclid=IwAR1rqa0I-Op9lEPcKJt2UzdmTBJxTGZa9G72wrgr6HSQcQXsD3sL2_LnWMo>
The next amp is the 80-15m band switched unit, using the same 3CX-6000A7
tube. I have finalized the design for the RF deck. Components of course are
a lot bigger. 1/2" silver plated tubing used for the 20-17-15m coil (and
also the L coil before the main PI-net). The 80-40-30 coil will be hand
wound, using 3/8" tubing.
500 pf ceramic vacuum tune cap, and a 3000 pf vacuum load cap. Same setup
for the TR relays. RJ1A for the cutoff bias, and a 2nd RJ1A for the input.
2 x paralleled RJ2B's for the output. 7-16 DIN connector for the output. 4
x 200pf HT-57 plate blockers used. I have also finalized the design for the
160-80-40-20-17-15m version. It uses a 4000 pf vac load cap, and one extra
coil.... for 160m (silver plated 1/4" tubing used). 8-9 x 200pf HT-57 plate
blockers used.
The HV supply will use a lot more B+ (7500 vdc)...and will use 2 x
identical plate xfmrs in parallel. Both designs employ a bandswitched PI
tuned input. (C1 + C2 are padded on 160m) Stay tuned.
Jim VE7RF
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