- 1. [Amps] Plate choke failure (score: 1)
- Author: Clark Turner <Clark@ClarkTurnerTuning.com>
- Date: Fri, 18 Mar 2016 14:44:13 -0700
- Last night while tuning my Amp, 2 x 3-1000Z, into the dummy load on 75 meters, I accidentally turned the Roller inductor instead of the Antenna load Crank. The two turns counters are side by side and
- /archives//html/Amps/2016-03/msg00036.html (7,187 bytes)
- 2. [Amps] Dual 3-1000Z amp problem (score: 1)
- Author: Clark Turner <Clark@ClarkTurnerTuning.com>
- Date: Mon, 18 Apr 2016 19:19:35 -0700
- I just finished my Dual 3-1000Z GG amplifier. I have an odd issue now that I cant seem to figure out. The amp will do 2KW with 40 watts of drive on 80 meters. Additional drive does not add any power
- /archives//html/Amps/2016-04/msg00029.html (7,302 bytes)
- 3. Re: [Amps] Dual 3-1000Z amp problem (score: 1)
- Author: Clark Turner <Clark@ClarkTurnerTuning.com>
- Date: Tue, 19 Apr 2016 20:30:32 -0700
- I think we figured out the issue. I had used 6K ohm for the plate load resistor and back fed the Network with a 259B in order to make a tuning chart. I should have used about 3K I guess. I set the C
- /archives//html/Amps/2016-04/msg00034.html (9,881 bytes)
- 4. Re: [Amps] Dual 3-1000Z amp problem (score: 1)
- Author: Clark Turner <Clark@ClarkTurnerTuning.com>
- Date: Thu, 21 Apr 2016 08:16:27 -0700
- Thank you for the reply. We found that I had used the wrong value plate load impedance when making my tuning chart. Once the network was tuned for 3K ohms, things started to work as they should. The
- /archives//html/Amps/2016-04/msg00041.html (10,625 bytes)
- 5. Re: [Amps] Oldie but Goodie MLA2500 questions (score: 1)
- Author: Clark Turner <Clark@ClarkTurnerTuning.com>
- Date: Fri, 3 Jun 2016 09:42:54 -0700
- When you see coils have bunched up, The choke took a heavy hit of current and the wire expanded with heat. I know because I have an amp here that likes to do that to the Ameritron plate choke. I have
- /archives//html/Amps/2016-06/msg00008.html (11,902 bytes)
- 6. [Amps] High power plate choke found. (score: 1)
- Author: Clark Turner <Clark@ClarkTurnerTuning.com>
- Date: Fri, 10 Jun 2016 09:03:55 -0700
- I found a man that makes high power plate chokes for 10 to 80 or 10 to 160. They are made on grooved machined Teflon with powdered iron core and heavy gauge wire. I ordered one for my 10 to 80 amplif
- /archives//html/Amps/2016-06/msg00021.html (8,106 bytes)
- 7. Re: [Amps] Ldmos heat spreaders (score: 1)
- Author: Clark Turner <Clark@ClarkTurnerTuning.com>
- Date: Mon, 15 Aug 2016 11:48:41 -0700
- I purchased my Spreader on ebay. Half inch thick, 15 X 7 slab of copper for two 188s C http://www.communication-concepts.com/heat-sinks/ 73, Tom W0IVJ I've only found up to 6mm think would this be ok
- /archives//html/Amps/2016-08/msg00027.html (8,823 bytes)
- 8. Re: [Amps] 75Th (score: 1)
- Author: Clark Turner <Clark@ClarkTurnerTuning.com>
- Date: Mon, 29 Aug 2016 08:55:29 -0700
- I think I might have a set. I also have some 100THs, 450s ect. I will check. C 73, Bob WØYVA http://www.isquare.com/personal_pages/ras-hardware.htm _______________________________________________ Amp
- /archives//html/Amps/2016-08/msg00075.html (7,584 bytes)
- 9. Re: [Amps] : LDMOS HEAT SPREADERS (score: 1)
- Author: Clark Turner <Clark@ClarkTurnerTuning.com>
- Date: Wed, 31 Aug 2016 09:19:57 -0700
- I have a dual BFR188 LDMOS HF amp I built with Water cooled heat sink. The Water block is 15 X8 inches at half inch thick. I have a 15 x 7 copper spreader mounted on top. The moderator refused my pos
- /archives//html/Amps/2016-08/msg00080.html (10,375 bytes)
- 10. Re: [Amps] What Do you think? (score: 1)
- Author: Clark Turner <Clark@ClarkTurnerTuning.com>
- Date: Sat, 10 Sep 2016 08:52:42 -0700
- We really need pictures of the amp. But at $900. Its almost a safe bet. The 3-1000 is the superior tube for ham radio use and will work at those lower voltages. The 4-1000s will require more voltage
- /archives//html/Amps/2016-09/msg00021.html (10,455 bytes)
- 11. Re: [Amps] What Do you think? (score: 1)
- Author: Clark Turner <Clark@ClarkTurnerTuning.com>
- Date: Wed, 14 Sep 2016 10:57:07 -0700
- It might have 7KV on the plate. I have seen amps where the builder used HALF scale on the HV meter as he did not have a meter scaled properly OR did not want the FCC to know. My last amp was that way
- /archives//html/Amps/2016-09/msg00049.html (10,265 bytes)
- 12. Re: [Amps] MLA2500 issue (score: 1)
- Author: Clark Turner <Clark@ClarkTurnerTuning.com>
- Date: Sun, 20 Nov 2016 08:18:52 -0700
- Another long shot: I had a MLA2500 that would also lose power when warm. After wasting hours trying to diagnose the amp, I unhooked it and realized the problem. The factory antenna output jack was wo
- /archives//html/Amps/2016-11/msg00076.html (11,156 bytes)
- 13. Re: [Amps] Amps Digest, Vol 173, Issue 56 (score: 1)
- Author: Clark Turner <Clark@ClarkTurnerTuning.com>
- Date: Tue, 23 May 2017 08:24:19 -0700
- I used this trick on my Dual 4-1000 amplifier. Power and Efficiency jumped way up on 10 and 15 meters with a home made inductor. I made the inductor out of flat stock and it was right at the tubes be
- /archives//html/Amps/2017-05/msg00260.html (15,637 bytes)
- 14. [Amps] 3-500Z cool down time (score: 1)
- Author: Clark Turner <Clark@ClarkTurnerTuning.com>
- Date: Mon, 5 Jun 2017 08:21:05 -0700
- RF parts supposedly told a local ham that 3-500Z RF parts tubes need a minimum of 30 Full minutes of cool down with the blower on and that they also need to warm up. He insisted they told him this in
- /archives//html/Amps/2017-06/msg00042.html (7,555 bytes)
- 15. Re: [Amps] 3-500Z cool down time (score: 1)
- Author: Clark Turner <Clark@ClarkTurnerTuning.com>
- Date: Mon, 5 Jun 2017 10:30:12 -0700
- That makes sense to me Gary. I have never heard of cracked Graphite plates. C Forced air on the tube is to keep the seal temperature down. All of the cooling of the plate is accomplished by radiation
- /archives//html/Amps/2017-06/msg00050.html (9,450 bytes)
- 16. Re: [Amps] 3-500Z cool down time (score: 1)
- Author: Clark Turner <Clark@ClarkTurnerTuning.com>
- Date: Mon, 5 Jun 2017 14:49:48 -0700
- I agree. I wondered if these newer made RF parts tubes are in fact not instant on and require warm up and cool down. C On 6/5/2017 10:28 AM, Joe wrote: Plus in my amp if I ever got the plates hot eno
- /archives//html/Amps/2017-06/msg00064.html (10,920 bytes)
- 17. [Amps] 4cX5000 amplifier (score: 1)
- Author: Clark Turner <Clark@clarkturnertuning.com>
- Date: Mon, 24 Sep 2018 09:22:49 -0700
- I have acquired an amplifier built by my Elmer (SK). The weather is starting to cool off so that means I can work in the garage. Its getting close to rebuild time for this amplifier. What I know: Th
- /archives//html/Amps/2018-09/msg00032.html (8,329 bytes)
- 18. Re: [Amps] Amps Digest, Vol 208, Issue 9 (score: 1)
- Author: Clark Turner <Clark@clarkturnertuning.com>
- Date: Fri, 24 Apr 2020 07:48:23 -0700
- The KW matchbox has an AC relay. Its operated for TR switching from any of the Johnson transmitters. Later models added a selenium rectifier and a capacitor to the circuit to place DC on the relay co
- /archives//html/Amps/2020-04/msg00019.html (15,263 bytes)
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