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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+power\s+limiting\s+in\s+8410\s+amps\?\s*$/: 16 ]

Total 16 documents matching your query.

1. [Amps] power limiting in 8410 amps? (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Thu, 1 Nov 2018 19:32:58 -0400
Hello all, Over the last week, or so, I seem to remember 'glossing over' messages and seeing some comment, by someone, mentioning that 8410 Alpha amps have some circuitry that tends to limit their ou
/archives//html/Amps/2018-11/msg00013.html (7,664 bytes)

2. Re: [Amps] power limiting in 8410 amps? (score: 1)
Author: Russ Williams via Amps <amps@contesting.com>
Date: Fri, 2 Nov 2018 18:35:30 +0000 (UTC)
Steve.  I would thrilled to get 1200 watts out of my L4B with 40 watts drive .  I actually know nothing about your amp, but I like to run mine at a fast idle rather than full bore.  If that extra 200
/archives//html/Amps/2018-11/msg00017.html (9,332 bytes)

3. Re: [Amps] power limiting in 8410 amps? (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Fri, 2 Nov 2018 15:07:17 -0400
Hi Russ, I'm not really concerned about the extra 200-300 watts.  I've been using them like this for years and all has been fine. I was just wondering, if they are using some power 'fold back' circui
/archives//html/Amps/2018-11/msg00020.html (11,269 bytes)

4. Re: [Amps] power limiting in 8410 amps? (score: 1)
Author: GWP <gm5bkc@gmail.com>
Date: Fri, 2 Nov 2018 14:34:09 -0600
There is no intentional OUTPUT power limiting circuit in the Alpha 8410 amplifiers. The 8410 firmware WILL put the amp in standby if the DRIVE power exceeds 75w for too long, to protect the input cir
/archives//html/Amps/2018-11/msg00021.html (10,746 bytes)

5. [Amps] power limiting in 8410 amps? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 3 Nov 2018 10:25:33 -0700
< Steve.? I would thrilled to get 1200 watts out of my L4B with 40 watts drive . <Russ KW6T not with 2500 vdc under load..and 800 ma plate current. I get 1290w pep out of my 4 x L4Bs on 80m, with cal
/archives//html/Amps/2018-11/msg00026.html (8,615 bytes)

6. [Amps] power limiting in 8410 amps? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 3 Nov 2018 10:40:54 -0700
<I ask because, I have 4 of these amps in my M/M contest station and I've <always noticed that the higher the power out, the more input it takes to <get there.?? They tune up real nice and easy to ab
/archives//html/Amps/2018-11/msg00027.html (8,400 bytes)

7. Re: [Amps] power limiting in 8410 amps? (score: 1)
Author: Bill Turner <dezrat@outlook.com>
Date: Sun, 4 Nov 2018 18:33:47 +0000
-- ORIGINAL MESSAGE --(may be snipped) REPLY: If it's LINEAR the output should be proportional to the drive. Sounds like you're having gain compression, which is NON linear. Most likely bad tube or p
/archives//html/Amps/2018-11/msg00028.html (8,201 bytes)

8. Re: [Amps] power limiting in 8410 amps? (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Sun, 4 Nov 2018 17:48:11 -0500
Hello Jim, I have several of them and it's all about the same. Plus/minus on different bands, but quite similar. I've had several people suggest it's because the screen voltage is only 200 volts. 73
/archives//html/Amps/2018-11/msg00029.html (9,745 bytes)

9. Re: [Amps] power limiting in 8410 amps? (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Sun, 4 Nov 2018 20:49:18 -0600
The Drake L4B only need 2-4 diodes for bias. The less ZSAC the harder it is to drive. 73 Jim W7RY On 11/3/2018 12:25 PM, Jim Thomson wrote: Message: 2 Date: Fri, 2 Nov 2018 18:35:30 +0000 (UTC) From:
/archives//html/Amps/2018-11/msg00030.html (9,390 bytes)

10. Re: [Amps] power limiting in 8410 amps? (score: 1)
Author: Russ Williams via Amps <amps@contesting.com>
Date: Mon, 5 Nov 2018 21:56:02 +0000 (UTC)
Jim, my response was a little toungue-in-cheek.  I know that I will never see 1200W out of my L4B with 40 watts of drive.  My point was to be happy with what the amp does produce when reasonably driv
/archives//html/Amps/2018-11/msg00031.html (9,693 bytes)

11. Re: [Amps] power limiting in 8410 amps? (score: 1)
Author: "Leigh Turner" <invertech@frontierisp.net.au>
Date: Tue, 6 Nov 2018 21:23:38 +1030
Yes I concur with this suggestion Steve. With only 200 Volts on the screen in AB1 linear mode the 4CX1500B tubes are likely being starved and held back like variously reported amongst 8410 amp users.
/archives//html/Amps/2018-11/msg00032.html (11,450 bytes)

12. Re: [Amps] power limiting in 8410 amps? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Tue, 6 Nov 2018 06:52:49 -0800
out on CW..with B+ in the ssb mode. The cooling is marginal at best, and the outborad B+ supply is not up to the task. All my xcvrs put out 200+ watts, so no big deal to drive anything. IMD from a 2
/archives//html/Amps/2018-11/msg00033.html (10,018 bytes)

13. [Amps] power limiting in 8410 amps? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Tue, 6 Nov 2018 07:14:18 -0800
<The Drake L4B only need 2-4 diodes for bias. The less ZSAC the harder it <is to drive. <73 <Jim W7RY installed a miniature spdt CENTER OFF toggle switch on the rear apron of the L4B RF deck. Then us
/archives//html/Amps/2018-11/msg00034.html (9,564 bytes)

14. Re: [Amps] power limiting in 8410 amps? (score: 1)
Author: GWP <gm5bkc@gmail.com>
Date: Wed, 7 Nov 2018 09:21:26 -0700
Production 8410 amps have the screen voltage set to 225v. Some very early production amps were set to 200. The tube operating bias is then adjusted for 200ma idle Ip and an 8410 can easily get 1500+
/archives//html/Amps/2018-11/msg00035.html (9,823 bytes)

15. Re: [Amps] power limiting in 8410 amps? (score: 1)
Author: "Leigh Turner" <invertech@frontierisp.net.au>
Date: Thu, 8 Nov 2018 09:26:55 +1030
Good point that you make here Glenn. My comment about optimum screen voltage for unconstrained Po was predicated on the assumption the design value of cathode NFB resistor(s) was still correct and ha
/archives//html/Amps/2018-11/msg00036.html (10,346 bytes)

16. [Amps] power limiting in 8410 amps? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 7 Nov 2018 23:10:10 -0800
<Yes I concur with this suggestion Steve. <With only 200 Volts on the screen in AB1 linear mode the 4CX1500B tubes are <likely being starved and held back like variously reported amongst 8410 amp <us
/archives//html/Amps/2018-11/msg00037.html (9,322 bytes)

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