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References: [ +from:clark@clarkturnertuning.com: 19 ]

Total 19 documents matching your query.

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)

19. Re: [Amps] Amps Digest, Vol 274, Issue 8 (score: 1)
Author: clark clarkturnertuning.com <clark@clarkturnertuning.com>
Date: Wed, 22 Oct 2025 16:05:31 +0000
I agree with Steve. I have done this in the past but noticed one running warmer than the other. It worked for me and will work this way, But it bothered me. They won't be exactly the same. Another wa
/archives//html/Amps/2025-10/msg00010.html (14,213 bytes)

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