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161. Re: [Amps] Using computer CPU coolers on GI46b triode ? (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Fri, 09 May 2014 14:17:26 -0400
I can easily see boring a CPU sink as a simpler alternative as long as a round silicone rubber chimney isnt required. That may be possible with an old "block with fins" type heat sink but many of the
/archives//html/Amps/2014-05/msg00040.html (8,560 bytes)

162. Re: [Amps] YAESU VL-1000 (Quadra) Question (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Tue, 17 Jun 2014 15:38:59 -0400
Most likely in 1997. The Quadra is not mentioned in the FT-1000MP manual (printing date 1995) but is shown in the FT-1000MP MK V manual (2001). Based on the serial numbers (7N04xxx and 8H09xxx), my Q
/archives//html/Amps/2014-06/msg00038.html (8,072 bytes)

163. Re: [Amps] Buck-Boost Transformer Selection (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Wed, 25 Jun 2014 16:00:06 -0400
The issue is that the Quadra was designed for the Japanese market in an era where the common input power level was 100/200 V and typical maximum voltages were 220V. As such a 240 V maximum input volt
/archives//html/Amps/2014-06/msg00084.html (10,178 bytes)

164. Re: [Amps] Buck-Boost Transformer Selection (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Wed, 25 Jun 2014 21:29:01 -0400
Yes. It's an OEM switcher with a Yaesu control board wrapped around it. The service manual contains no information on the OEM unit. 73, ... Joe, W4TV 73 Jim W7RY --Original Message-- From: Joe Subich
/archives//html/Amps/2014-06/msg00095.html (11,305 bytes)

165. Re: [Amps] 4Z4RB amplifiers (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Wed, 02 Jul 2014 10:35:21 -0400
Duty cycle would be determined by the heat sink and fans you choose to add. 73, ... Joe, W4TV Here's one: http://www.ebay.com/itm/2KW-VERY-HIGH-POWER-2x-LDMOS-BOARD-LINEAR-AMPLIFIER-/161284955586 an
/archives//html/Amps/2014-07/msg00005.html (7,407 bytes)

166. Re: [Amps] Don't Pass This One Up Boys! (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Thu, 31 Jul 2014 23:37:11 -0400
For most of them, a lobotomy would be an upgrade. 73, ... Joe, W4TV CB amps grind me. REPLY: It's not true that CB'ers are required to have a partial lobotomy before getting on the air. They require
/archives//html/Amps/2014-07/msg00124.html (8,117 bytes)

167. Re: [Amps] Drake L7 issue (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Fri, 26 Sep 2014 18:36:53 -0400
I don't know the L7, so I don't know if it uses 120V for anything (like a fan), but the proper connection of 240V is two hots and a ground, NOT neutral. The L7 schematic http://www.qsl.net/ea4bb/EA4B
/archives//html/Amps/2014-09/msg00028.html (8,802 bytes)

168. Re: [Amps] Drake L7 issue (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Fri, 26 Sep 2014 21:50:59 -0400
To correctly convert the L7 may take a bit more work, but it looks manageable. Or, live with it knowing that limitation. The L7 has no neutral connection and the ground is not current carrying. The g
/archives//html/Amps/2014-09/msg00031.html (9,845 bytes)

169. Re: [Amps] Multi-tube vs Single or Dual-tube amps? (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Mon, 19 Jan 2015 17:00:14 -0500
Filament require high current capability, tank circuits become more complex because of the change in load impedance, Filament current requirements are generally proportional to the peak current capab
/archives//html/Amps/2015-01/msg00153.html (11,143 bytes)

170. Re: [Amps] Vendor For Transformer Rewind (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sat, 24 Jan 2015 12:07:16 -0500
Most residential in the US is 120/240 - even 123/246 as utilities push the limits to minimize transmission losses. Just for fun, I just checked my line voltage. Here in a semi-rural area on Saturday
/archives//html/Amps/2015-01/msg00253.html (9,819 bytes)

171. Re: [Amps] GU84b tubes (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Thu, 29 Jan 2015 21:46:03 -0500
30 seconds with Google gives www.urrll.net 73, ... Joe, W4TV --Original Message-- From: Behiels jean-Pierre Sent: Thursday, January 29, 2015 7:33 AM To: amps@contesting.com Subject: [Amps] GU84b tube
/archives//html/Amps/2015-01/msg00373.html (8,301 bytes)

172. Re: [Amps] I'm not kidding: TL922 (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Fri, 06 Feb 2015 15:02:22 -0500
I used to also be able to hear the 15 kHz sound from TV sweep oscillators. ... and the 19 KHz stereo pilot tone on FM receivers. 73, ... Joe, W4TV One of the advantages of growing up is not hearing t
/archives//html/Amps/2015-02/msg00080.html (10,457 bytes)

173. Re: [Amps] Time for New Power Meter (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Mon, 20 Apr 2015 15:57:23 -0400
For a basic wattmeter the TelepostLP-100 is hard to beat. If you want antenna analysis, linearity measurement, phase detection (phased array set-up), etc. the microHAM SMoRF should be ready around Fr
/archives//html/Amps/2015-04/msg00136.html (8,531 bytes)

174. Re: [Amps] Time for New Power Meter (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sun, 03 May 2015 08:44:10 -0400
No, Roger is correct. Bird's specification is 5% *of full scale*. That means the Bird's accuracy is +/- 125 Watts *anywhere* using a 2500 Watt element. While in practice the accuracy may be higher a
/archives//html/Amps/2015-05/msg00020.html (9,598 bytes)

175. Re: [Amps] Time for New Power Meter (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Sun, 03 May 2015 19:19:41 -0400
Yes, that is *exactly* what Bird meant. The specifications in my Bird Model 43 Instruction Book say: "Accuracy - +/- 5% of Full Scale Power". If *your* interpretation were correct it would say "+/-
/archives//html/Amps/2015-05/msg00032.html (10,740 bytes)

176. Re: [Amps] Time for New Power Meter (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Mon, 04 May 2015 19:01:50 -0400
To be blunt ... in the 1950's and 1960's power limits were based on *input* power not output power. Input power is quite easily and accurately measured as V * I to the final amplifier tube. The citat
/archives//html/Amps/2015-05/msg00065.html (9,971 bytes)

177. Re: [Amps] SPE 2K RTTY Duty Cycle (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Mon, 18 May 2015 14:25:57 -0400
Most of the modes that claim the ability to hold a QSO under poor conditions at 30 - 50W fall apart very quickly with multipath or QRM. The claims are based on "flat noise" which is very rarely the
/archives//html/Amps/2015-05/msg00134.html (9,638 bytes)

178. Re: [Amps] SPE 2K RTTY Duty Cycle / spectral cleanliness (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Fri, 22 May 2015 09:42:44 -0400
It's any of the odd order IM since that falls in the adjacent "channel" and creates QRM. Even with low -30 dB IMD, that's a watt or so of power in each of the IM products for a 1500 W amplifier. The
/archives//html/Amps/2015-05/msg00147.html (13,185 bytes)

179. Re: [Amps] SPE 2K RTTY Duty Cycle / spectral cleanliness (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Fri, 22 May 2015 13:41:47 -0400
The FT-990 and FT-767GX probably used the same devices as they were contemporary rigs from the same manufacturer. But this is the point, the devices were rated for much higher power when meant they w
/archives//html/Amps/2015-05/msg00155.html (7,926 bytes)

180. Re: [Amps] 12V IM3 (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Fri, 22 May 2015 15:04:08 -0400
First, tube amplifiers (except for the sweep tube variants) have more headroom than a SS amp. Second, the tube amplifier saturates slowly while the gain curve of solid state devices have a very prono
/archives//html/Amps/2015-05/msg00158.html (10,181 bytes)

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