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1. [AMPS] BOUNCE amps@contesting.com: taboo header:/^from:\s*km1h\@juno.com\b/i (score: 1): Author: owner-amps@contesting.com (by way of "Bill Fisher, W4AN" <w4an@contesting.com>); Date: Sun, 6 Apr 1997 20:39:28 -0400 (EDT); To: K7SX@worldnet.att.net, amps@contesting.com Subject: Re: [AMPS] mods L-4B Message-ID: <19970406.190404.9983.2.km1h@juno.com> References: <19970406194611.AAA5976@davida.utw.com> X-Mailer: Juno 1.15; /archives//html/Amps/1997-04/msg00131.html (8,314 bytes)
2. [AMPS] BOUNCE amps@contesting.com: taboo header:/^from:\s.*w8jitom.*/i (score: 1): Author: owner-amps@contesting.com (by way of KS9K Paul Hellenberg <paulh@truline.com>); Date: Mon, 14 Apr 1997 14:55:44 -0500 (CDT); Received: from mtigwc03.worldnet.att.net (mailhost.worldnet.att.net [204.127.131.34]) by dayton.akorn.net (8.8.5/8.8.5) with ESMTP id KAA10006 for <amps@contesting.com>; Mon, 14 Apr 1997 10:16:09 -0; /archives//html/Amps/1997-04/msg00182.html (9,413 bytes)
3. [AMPS] BOUNCE amps@contesting.com: taboo header:/^from:\s.*w8jitom.*/i (score: 1): Author: owner-amps@contesting.com (by way of KS9K Paul Hellenberg <paulh@truline.com>); Date: Mon, 14 Apr 1997 14:56:40 -0500 (CDT); From: "Tom Rauch (W8JI)" <W8JItom@worldnet.att.net> Reply-To: w8jitom@worldnet.att.net X-Mailer: Mozilla 3.01 (Win95; I) MIME-Version: 1.0 To: amps@contesting.com, KC0EI@aol.com Subject: Re: [AMPS] C; /archives//html/Amps/1997-04/msg00183.html (8,819 bytes)
4. Re: [Amps] A question about grid bias in G3SEK's control board (score: 1): Author: Hsu via Amps <amps@contesting.com>; Date: Sat, 19 Apr 2014 21:18:58 +0800; Thanks. Most of amplifier only use one transformer, the secondary's Voltage can dip about 15- 20% when full load. If it did not regulated,the bias Voltage will chage. I think the ruglated power suppl; /archives//html/Amps/2014-04/msg00177.html (10,305 bytes)
5. Re: [Amps] SB220 tune cap (score: 1): Author: Carl via Amps <amps@contesting.com>; Date: Sat, 19 Apr 2014 10:37:01 -0400; That is correct Pete. There are 2 basic reasons for SB-220 (and most all amps) arcing. 1. Open circuit at the relay, wrong band selected, high VSWR, tuner (many reasons), remote antenna switch, feedl; /archives//html/Amps/2014-04/msg00178.html (11,889 bytes)
6. Re: [Amps] SB220 tune cap (score: 1): Author: Robert Groh via Amps <amps@contesting.com>; Date: Sat, 19 Apr 2014 08:32:31 -0700 (PDT); Great info, Carl - thanks. Bob Groh, WA2CKY That is correct Pete. There are 2 basic reasons for SB-220 (and most all amps) arcing. 1. Open circuit at the relay, wrong band selected, high VSWR, tuner; /archives//html/Amps/2014-04/msg00179.html (12,789 bytes)
7. Re: [Amps] WEIRD ONE! (score: 1): Author: Bryan Swadener via Amps <amps@contesting.com>; Date: Sun, 20 Apr 2014 11:54:17 -0700 (PDT); Hi Bill, The GI-7b has one side of the heater tied to the cathode. Feeding bias thru the transformer CT results in modulating the amplified signal with 60 Hz. A friend did the same thing. Look at htt; /archives//html/Amps/2014-04/msg00183.html (8,821 bytes)
8. Re: [Amps] Filament Voltage Question (score: 1): Author: Radio WC6W via Amps <amps@contesting.com>; Date: Tue, 22 Apr 2014 08:28:25 -0700 (PDT); Hi Jim, That tube employs a DIRECTLY heated filament. Two good reasons for low voltage in this case: High voltage operation would require thin elements that would be mechanically fragile. Current dis; /archives//html/Amps/2014-04/msg00187.html (8,721 bytes)
9. [Amps] Filter capacitors (score: 1): Author: Robert Logan via Amps <amps@contesting.com>; Date: Tue, 22 Apr 2014 16:39:48 -0500; Are there any adverse effects to doubling the capacitance (leaving voltage ratings at spec) of an electrolytic in a 300 or an 800 voltage power supply? I have new ones on hand to replace old, leaky o; /archives//html/Amps/2014-04/msg00197.html (7,286 bytes)
10. Re: [Amps] Filter capacitors (score: 1): Author: Robert Logan via Amps <amps@contesting.com>; Date: Tue, 22 Apr 2014 19:05:31 -0500; Very thoughtful, Carl. Thank you. Bob Sent from my iPhone It all depends on what they are used for.... If its capacitor input followed by a choke the output will be higher, especially at low or no lo; /archives//html/Amps/2014-04/msg00202.html (9,134 bytes)
11. Re: [Amps] Filter capacitors (score: 1): Author: Robert Logan via Amps <amps@contesting.com>; Date: Tue, 22 Apr 2014 19:07:59 -0500; Bill, sounds like the adverse effects for obscure medicines advertised on TV! But good cautionary info. Thanks. Bob Sent from my iPhone ORIGINAL MESSAGE: (may be snipped) REPLY: There are several adv; /archives//html/Amps/2014-04/msg00203.html (9,176 bytes)
12. Re: [Amps] Alpha 78 with 8874 Triodes (score: 1): Author: Glen Zook via Amps <amps@contesting.com>; Date: Wed, 23 Apr 2014 14:21:51 -0700 (PDT); http://k9sth.com/uploads/160-meter_amplifier_article-1.pdf So far, my Tempo-2001 linear amplifier, which uses a pair of the 8874 tubes, is still working fine. But, if the tubes did go soft, I would; /archives//html/Amps/2014-04/msg00209.html (9,780 bytes)
13. Re: [Amps] Alpha 78 with 8874 Triodes (score: 1): Author: Jeff Blaine via Amps <amps@contesting.com>; Date: Wed, 23 Apr 2014 17:22:25 -0500; I have a 76pa with the trio of 8874 and have considered the same swap. The practical problem with the GI7b is that at 2200V that we have typically in the Alpha, you really end up driving the tube pre; /archives//html/Amps/2014-04/msg00211.html (11,464 bytes)
14. Re: [Amps] WEIRD ONE SOLVED (score: 1): Author: Bryan Swadener via Amps <amps@contesting.com>; Date: Fri, 25 Apr 2014 17:19:47 -0700 (PDT); And no more 60Hz hum from feeding the bias thru the filament xfmr CT. vy 73, Bryan WA7PRC -- The negative lead of the bias board should have been grounded instead of attaching to B- since the GI7-B h; /archives//html/Amps/2014-04/msg00222.html (7,492 bytes)
15. [Amps] henry 2-kd classic desktop amp (score: 1): Author: Douglas Johnson via Amps <amps@contesting.com>; Date: Sat, 26 Apr 2014 09:35:24 -0700 (PDT); Hi, looking for some ideas on the henry amp I bought at an estate sale. It was wired 110v and when plugged in did nothing, no start or anything. Converted it to 220v ac and it immediately came to lif; /archives//html/Amps/2014-04/msg00225.html (7,315 bytes)
16. Re: [Amps] 8122 and 8072 (score: 1): Author: Glen Zook via Amps <amps@contesting.com>; Date: Sat, 10 May 2014 08:28:15 -0700 (PDT); Especially Motorola used the 8072 extensively in their 450 MHz base stations and in a few mobile units. I still have a number of the tubes, brand new, that I acquired when I got the tube stock and s; /archives//html/Amps/2014-05/msg00059.html (15,395 bytes)
17. [Amps] WTB: Bud MC-941 (score: 1): Author: Radio WC6W via Amps <amps@contesting.com>; Date: Sat, 10 May 2014 12:58:17 -0700 (PDT); QST I'm looking for an ancient Bud MC-941 100pf air variable capacitor for an amp project. There has been one on EPAY (350970233658) for quite a while but, it is rather tarnished and worse, out of al; /archives//html/Amps/2014-05/msg00062.html (6,849 bytes)
18. Re: [Amps] Using computer CPU coolers on GI46b triode ? (score: 1): Author: Jeff Blaine via Amps <amps@contesting.com>; Date: Sat, 10 May 2014 21:12:18 -0500; The CPUL cooler used as a heatspreader with an external fan may work. You can test it by running the amp for a bit and using a non-contact IR to measure the tube at the interface between the cooler a; /archives//html/Amps/2014-05/msg00066.html (11,809 bytes)
19. [Amps] Looking for Door Knob Capacitor (score: 1): Author: Ed Hatcher via Amps <amps@contesting.com>; Date: Sun, 11 May 2014 18:24:26 -0700 (PDT); I am in need of a 220pf; 250pf; or 270pf, rated at about 15kv. Would also consider several 50pf. American made only. Thanks and 73, Ed-kv5i (eh_54@yahoo.com). P.S. Is there anyone out there that know; /archives//html/Amps/2014-05/msg00067.html (6,926 bytes)
20. [Amps] OT: Blonder Tongue FSM-6B (score: 1): Author: Dave Hartman via Amps <amps@contesting.com>; Date: Mon, 12 May 2014 23:34:06 -0400; I know this is off topic, but here goes. I'm looking for a manual, or at least a schematic for a BlonderTongur FSM-6B, VHF-UHF signal strength meter. Please reply off list. Thanks! Dave - AC2GL@aol.c; /archives//html/Amps/2014-05/msg00075.html (6,680 bytes)

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