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References: [ +from:g8gsq@gmx.com: 9 ]

Total 9 documents matching your query.

1. Re: [Amps] Pem Nuts ? (score: 1)
Author: Steve Thompson <g8gsq@gmx.com>
Date: Wed, 26 Oct 2022 08:55:46 +0100
I've never managed to make the self clinching ones work at home, probably don't have the right sort of press capacity. I've used the PEM AETS swaged inserts (see Memfast brand in the UK), things I ge
/archives//html/Amps/2022-10/msg00066.html (8,743 bytes)

2. Re: [Amps] 10 KW CCS ON 6M...USING THE 3CX-6000A7... PART 12 (score: 1)
Author: Steve Thompson <g8gsq@gmx.com>
Date: Thu, 24 Nov 2022 22:35:24 +0000
For sure the stub (looking like a short to even harmonics) works best when combined with some series inductance to work against. Hopefully the load cap is already a low impedance to harmonics so the
/archives//html/Amps/2022-11/msg00069.html (14,015 bytes)

3. Re: [Amps] Need reliable source for ACOM2000A tubes GU74B? (score: 1)
Author: Steve Thompson <g8gsq@gmx.com>
Date: Thu, 24 Nov 2022 22:36:15 +0000
4CX800 was a Svetlana part number, doubtless chosen to match Eimac's nomenclature. Vyne Antennas in the UK used to support Acom products and supply tubes. They had a test setup for conditioning and m
/archives//html/Amps/2022-11/msg00070.html (10,931 bytes)

4. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: Steve Thompson <g8gsq@gmx.com>
Date: Tue, 13 Dec 2022 08:28:20 +0000
It's not only uniformity, also the 'controlled avalanche' of modern diodes. As you reach breakdown they don't fail instantly from too much reverse voltage, they start to conduct slightly. In a string
/archives//html/Amps/2022-12/msg00042.html (11,673 bytes)

5. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: Steve Thompson <g8gsq@gmx.com>
Date: Wed, 14 Dec 2022 08:52:51 +0000
Yes, that's my understanding of it. Some years ago there was quite a bit of discussion about it here. Steve G8GSQ On 13/12/2022 17:21, MU 4CX250B wrote: An interesting point, Steve. If I understand y
/archives//html/Amps/2022-12/msg00062.html (14,632 bytes)

6. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: Steve Thompson <g8gsq@gmx.com>
Date: Wed, 14 Dec 2022 08:55:10 +0000
As I understand it, the diode doesn't go low resistance when it avalanches, it's more like the characteristic we associate with a zener type diode so it maintains its own particular breakdown voltage
/archives//html/Amps/2022-12/msg00063.html (11,077 bytes)

7. Re: [Amps] 8877 heater open circuit after shipping (score: 1)
Author: Steve Thompson <g8gsq@gmx.com>
Date: Sat, 25 Mar 2023 17:16:19 +0000
I have two of them where the heaters measure open when they are upside down but normal when upright. That way up they work fine as long as the heater supply doesn't have high inrush current. They are
/archives//html/Amps/2023-03/msg00023.html (8,559 bytes)

8. Re: [Amps] Amp Supply LK-550 (550) need replace inrush module's resistor - o (score: 1)
Author: Steve Thompson <g8gsq@gmx.com>
Date: Thu, 12 Oct 2023 18:12:01 +0100
After blowing a step start resistor I've taken to adding a fuse in series with them. A slow blow 2A fuse will take 20A for 100ms, plenty to cover any likely inrush but will blow fast enough to protec
/archives//html/Amps/2023-10/msg00029.html (8,726 bytes)

9. Re: [Amps] High filament current on the 8877 amplifier tube (score: 1)
Author: Steve Thompson <g8gsq@gmx.com>
Date: Mon, 16 Oct 2023 23:24:41 +0100
Assuming they are Eimac manufacture, try asking CPI/Eimac for advice. The only hazardous material in them is going to be the cathode coating (Typ. Barium and Strontium oxides); radio and TV tubes con
/archives//html/Amps/2023-10/msg00039.html (9,422 bytes)


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