- 1. [Amps] FW: 3-500z Silly question (score: 1)
- Author: MIKE DURKIN <patriot121@msn.com>
- Date: Sat, 5 Sep 2009 11:39:30 -0700
- Center Tap ?? Measurements have been made from the choke to each 3-500z filament ... then divided by 2 ... I have solved my issues with marginal voltage for my 24V relays. I was hoping that the 12V w
- /archives//html/Amps/2009-09/msg00049.html (9,238 bytes)
- 2. Re: [Amps] FW: 3-500z Silly question (score: 1)
- Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
- Date: Sat, 05 Sep 2009 19:22:19 -0700
- ORIGINAL MESSAGE: REPLY: This is a grounded grid amp, right? The input impedance of a single 3-500Z will be on the order of 115 ohms according to the Eimac data sheet, but this is only when cathode c
- /archives//html/Amps/2009-09/msg00051.html (9,546 bytes)
- 3. Re: [Amps] FW: 3-500z Silly question (score: 1)
- Author: "Alex Eban" <alexeban@gmail.com>
- Date: Sun, 6 Sep 2009 10:03:38 +0300
- DC operation of a directly heated tube is problematic, to say the least. The DC component of the heater voltage combines with the bias voltage to produce a varying voltage along the filament, causing
- /archives//html/Amps/2009-09/msg00056.html (11,243 bytes)
- 4. Re: [Amps] FW: 3-500z Silly question (score: 1)
- Author: "Carl" <km1h@jeremy.mv.com>
- Date: Sun, 6 Sep 2009 08:45:58 -0400
- Operating at zero bias would eliminate that problem if it actually exists. Ive minimal experience in mobile operation but the Heath HA-14 didnt have any filament issues that Im aware of. Carl KM1H __
- /archives//html/Amps/2009-09/msg00060.html (12,834 bytes)
- 5. Re: [Amps] FW: 3-500z Silly question (score: 1)
- Author: "Phil Clements" <philc@texascellnet.com>
- Date: Sun, 6 Sep 2009 12:10:37 -0500
- I ran a pair of GG 813's mobile for years in the 1960's. Most of the surplus houses back then had them for $5.00 NIB! I never had to change out the original pair. I obtained the 10 volts for the fil
- /archives//html/Amps/2009-09/msg00062.html (9,288 bytes)
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