Search String: Display: Description: Sort:

Results:

References: [ +from:k3lr@k3lr.com: 68 ]

Total 68 documents matching your query.

61. Re: [Amps] 8877 (score: 1)
Author: "Tim Duffy" <k3lr@k3lr.com>
Date: Wed, 26 Jan 2022 22:16:33 -0500
Hi John They are not available at DX Engineering at this time. Maybe again in the future 73 Tim K3LR @ DX Engineering I concur that with proper use and even with an occasional oops wrong antenna, an
/archives//html/Amps/2022-01/msg00099.html (8,712 bytes)

62. Re: [Amps] SB-221 repair person in CA (score: 1)
Author: "Tim Duffy" <k3lr@k3lr.com>
Date: Mon, 28 Nov 2022 14:17:24 -0500
The best place to get an amplifier repaired in California. https://islandamplifier.com/ 73 Tim K3LR --Original Message-- From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Ken Beals Sent: M
/archives//html/Amps/2022-11/msg00087.html (7,346 bytes)

63. Re: [Amps] Noisy relay (score: 1)
Author: "Tim Duffy" <k3lr@k3lr.com>
Date: Sun, 11 Dec 2022 21:00:02 -0500
Hello Jim Does that clamping diode across the coil affect the TX key up delay time? As in "slow it down"? 73 Tim K3LR Steve, you might be hearing the induced voltage kick caused by the inductance of
/archives//html/Amps/2022-12/msg00030.html (8,797 bytes)

64. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: "Tim Duffy" <k3lr@k3lr.com>
Date: Sun, 11 Dec 2022 21:03:23 -0500
W8ZR Jim Can you give advice on this topic? 73 Tim K3LR What's the consensus on wiring .01uf disc caps across diodes in a HV supply ? W8JI sez they are required, and used in ameritron amps....and use
/archives//html/Amps/2022-12/msg00031.html (8,080 bytes)

65. Re: [Amps] Noisy relay (score: 1)
Author: "Tim Duffy" <k3lr@k3lr.com>
Date: Mon, 12 Dec 2022 02:38:19 -0500
Thanks Jim My concern is with the diode(s) across the relay(s) coil (or Zener diode combo) does it affect the timing on the front end closure of the relays? As in TX delay settings? So when the relay
/archives//html/Amps/2022-12/msg00036.html (10,316 bytes)

66. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: "Tim Duffy" <k3lr@k3lr.com>
Date: Tue, 13 Dec 2022 20:38:39 -0500
My question around the .01 uF caps on the HV rectifier diodes was not so much about diode preservation or protection - I am curious about any possible RFI generation from the HV diodes or more import
/archives//html/Amps/2022-12/msg00050.html (10,725 bytes)

67. [Amps] High filament current on the 8877 amplifier tube (score: 1)
Author: "Tim Duffy" <k3lr@k3lr.com>
Date: Sun, 8 Oct 2023 14:48:25 -0400
Most 8877 tubes that I test draw 11 amps of filament current at 5 volts. I have tested three recently that draw 15 amps of filament current. All of these tubes are used and have little "dings". Is 15
/archives//html/Amps/2023-10/msg00021.html (6,654 bytes)

68. Re: [Amps] High filament current on the 8877 amplifier tube (score: 1)
Author: "Tim Duffy" <k3lr@k3lr.com>
Date: Mon, 16 Oct 2023 02:46:07 -0400
I am still testing 8877s here. Two or three every day. They warm up with filament only for 4 hours before HV. What I have learned is that 8877's drawing 15 amps of filament current are bad tubes. The
/archives//html/Amps/2023-10/msg00036.html (8,352 bytes)

Current List: 61 - 68
Page: [1] [2] [3] [4]
This search system is powered by Namazu