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81. [Amps] SB-220 (score: 1)
Author: Joe <nss@mwt.net>
Date: Wed, 24 Mar 2021 09:46:28 -0500
Need advice, I am assuming some of you here are also on the Heathkit HF Amps E -Mail list. So I won't go into the long drawn out story here unless asked to do so if needed. I re-built this old SB-220
/archives//html/Amps/2021-03/msg00041.html (7,382 bytes)

82. Re: [Amps] SB-220 (score: 1)
Author: Joe <nss@mwt.net>
Date: Tue, 30 Mar 2021 10:29:25 -0500
I pushed the HV up a LOT, now running 3700/3800 volts. Joe WB9SBD Sig The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.idle-tyme.com <http://www.idle-tyme.com> On 3/30/2021 9:48 AM,
/archives//html/Amps/2021-03/msg00047.html (9,972 bytes)

83. [Amps] SB-220 Output Network (score: 1)
Author: Joe <nss@mwt.net>
Date: Thu, 12 Aug 2021 11:57:07 -0500
Hopefully some of you here may remember my adventures with this SB-220. I'm the one that ran RTTY at full power in a RTTY Contest and literally melted down the HV transformer. And in the process toas
/archives//html/Amps/2021-08/msg00018.html (10,388 bytes)

84. Re: [Amps] SB-220 Output Network (score: 1)
Author: Joe <nss@mwt.net>
Date: Thu, 12 Aug 2021 12:42:18 -0500
Thanks, Will check it out. It's all working and has worked perfectly without any issues of any kind for over 2 years now. No arc's nothing at all. it is just to make it have a well you know the load
/archives//html/Amps/2021-08/msg00020.html (11,644 bytes)

85. Re: [Amps] SB-220 Output Network (score: 1)
Author: Joe <nss@mwt.net>
Date: Thu, 12 Aug 2021 17:29:34 -0500
The amp has been working perfectly fine for 2 years now not a single arc ever. I will try to find the spec's for the 3K unless someone knows where some is. Joe WB9SBD 73, Dick, W1KSZ You might consid
/archives//html/Amps/2021-08/msg00024.html (14,471 bytes)

86. Re: [Amps] SB-220 Output Network (score: 1)
Author: Joe <nss@mwt.net>
Date: Thu, 12 Aug 2021 18:30:23 -0500
The 3K is a very different design. Joe WB9SBD I will try to find the spec's for the 3K unless someone knows where some is. Joe WB9SBD 73, Dick, W1KSZ On Thu, Aug 12, 2021, 3:15 PM Mark Bitterlich<mar
/archives//html/Amps/2021-08/msg00026.html (14,525 bytes)

87. Re: [Amps] SB-220 Output Network (score: 1)
Author: Joe <nss@mwt.net>
Date: Fri, 13 Aug 2021 08:42:35 -0500
I looked at their schematic. and it's totally different. Joe WB9SBD On 8/12/2021 5:15 PM, Mark Bitterlich wrote: You might consider looking at the network design values of the Henry 3k that used a pa
/archives//html/Amps/2021-08/msg00028.html (13,641 bytes)

88. Re: [Amps] Testing Tubes with a Henry 2K (score: 1)
Author: Joe <nss@mwt.net>
Date: Sun, 22 Aug 2021 11:33:40 -0500
Using OHMS law,  that would be a resistor of 0.35211 Ohms, and 71 watts, YIKES! Joe WB9SBD Has anyone contemplated what it would take to create a "dummy" 3-500 for testing in cases like this? Somethi
/archives//html/Amps/2021-08/msg00066.html (9,032 bytes)

89. [Amps] Amp With A Roller Inductor? (score: 1)
Author: Joe <nss@mwt.net>
Date: Mon, 13 Sep 2021 14:36:07 -0500
Here's a Question, Been hitting a dead end. I have had various AMPs all my Ham life, from 1975. But all have been like the SB-220, SB-220, SB-200 FL-2100, Henry 2K etc. Plate cap, load cap, tapped in
/archives//html/Amps/2021-09/msg00007.html (6,905 bytes)

90. [Amps] SWR Bandwidth? (score: 1)
Author: Joe <nss@mwt.net>
Date: Wed, 22 Sep 2021 09:29:01 -0500
When doing what I call a reverse SWR check, Where you place resistors from the plate connection to ground to simulate the Plate Load Impedance. Then activate the T/R Relay. And measure the SWR on the
/archives//html/Amps/2021-09/msg00011.html (6,474 bytes)

91. [Amps] Need Smarter Than I Am Help. (score: 1)
Author: Joe <nss@mwt.net>
Date: Fri, 8 Oct 2021 10:10:35 -0500
As many of you here know, I have been making some MAJOR changes to this Heathkit SB-220 amp. Many here, and many other places, have helped me both on these E-Mail lists as well as directly. I am extr
/archives//html/Amps/2021-10/msg00000.html (11,649 bytes)

92. Re: [Amps] Need Smarter Than I Am Help. (score: 1)
Author: Joe <nss@mwt.net>
Date: Mon, 11 Oct 2021 09:33:56 -0500
This IS a valid question. I am not sure about others, In my case it was 90% Cost. With side effect benefits. I knew that for high duty cycle modes you should run this amp at reduced power. I was usin
/archives//html/Amps/2021-10/msg00032.html (12,416 bytes)

93. Re: [Amps] Need Smarter Than I Am Help. (score: 1)
Author: Joe <nss@mwt.net>
Date: Mon, 11 Oct 2021 11:54:03 -0500
Thanks for the lead! Now can anyone scan those page(s) and e mail them to me? I do not have access to any of the Handbooks.  I had the CD version, but can not seem to find it. Joe WB9SBD On 10/11/202
/archives//html/Amps/2021-10/msg00034.html (15,270 bytes)

94. [Amps] Verify "Q" (score: 1)
Author: Joe <nss@mwt.net>
Date: Thu, 14 Oct 2021 15:30:15 -0500
Ok, Lots of reading, LOTS of help from others here. This should be the last bit of questions I have the need of help with. When doing the like reverse plate load simulation test.  I have been told, a
/archives//html/Amps/2021-10/msg00062.html (6,813 bytes)

95. Re: [Amps] Centrifugal Blowers (score: 1)
Author: Joe <nss@mwt.net>
Date: Thu, 27 Jan 2022 13:08:29 -0600
On mine I have a light bulb in series with the blower, and if temp rises above a set point the bulb is by-passed. Vary the wattage of the bulb till you get the desired speed. Joe  WB9SBD / W9ET 73, R
/archives//html/Amps/2022-01/msg00108.html (10,038 bytes)

96. [Amps] Is an AMP worthwhile. (score: 1)
Author: Joe <nss@mwt.net>
Date: Mon, 7 Mar 2022 17:13:24 -0600
I have been for quite some time now fighting with this Frankenstein of an AMP trying to get it to work correctly. It works making power and LOTS of it, But the Load Cap, is all funky. When measured w
/archives//html/Amps/2022-03/msg00009.html (8,342 bytes)

97. Re: [Amps] Is an AMP worthwhile. (score: 1)
Author: Joe <nss@mwt.net>
Date: Mon, 7 Mar 2022 22:24:25 -0600
Hi David, Yes tuning into a perfect 1 to 1 dummy, or resonant antenna. The AMP is defyng all logic. It is an old SB-220. with different HV supply, 3700/380 volts Because of the higher voltage the tan
/archives//html/Amps/2022-03/msg00016.html (11,291 bytes)

98. Re: [Amps] Is an AMP worthwhile. (score: 1)
Author: Joe <nss@mwt.net>
Date: Mon, 7 Mar 2022 22:26:27 -0600
YUP YUP YUP. jOE wb9sbd / w9et Is this the amplifier you removed the tank circuit and replaced with a roller coil? And increased the plate voltage as well? 73, Jim W7RY On 3/7/2022 5:13 PM, Joe wrote
/archives//html/Amps/2022-03/msg00017.html (10,135 bytes)

99. Re: [Amps] 4 KW? (score: 1)
Author: Joe <nss@mwt.net>
Date: Thu, 23 Jun 2022 20:41:39 -0500
here is 80 watts in and 26 KW OUT http://www.dc9dz.de/en/tsunami100k.html Joe WB9SBD On 6/23/2022 8:35 PM, Paul Christensen wrote: The 4001A uses 2 of those FU728F tubes! But at the expense of losing
/archives//html/Amps/2022-06/msg00106.html (8,789 bytes)

100. [Amps] Harbach RM-220 Board (score: 1)
Author: Joe <nss@mwt.net>
Date: Wed, 10 Aug 2022 09:19:20 -0500
Does anyone have, or know of what the values typically are for say all the resistors while in the board and in the amp? One resistor may have a native value of "X" but when it is in the board and ins
/archives//html/Amps/2022-08/msg00005.html (6,529 bytes)

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