From ac1wye at gmail.com Mon May 1 15:35:45 2017 From: ac1wye at gmail.com (Alexander N. Gerli) Date: Mon, 01 May 2017 19:35:45 +0000 Subject: [Hallicrafters] TW-2000 WANTED Message-ID: Looking for a working one, not a basket case. 73, Sandy AC1Y -- Sent from Sandy's Gmail Mobile From gharmon at idworld.net Sun May 7 21:10:16 2017 From: gharmon at idworld.net (Gary H. Harmon, Jr.) Date: Sun, 7 May 2017 20:10:16 -0500 Subject: [Hallicrafters] SX-115 Needs Message-ID: 1. ANT TRIM knob. 2. RF GAIN knob. 3. Front panel. 4. S-Meter and bracket. Never hurts to ask. 73, Gary H. Harmon, Jr. - K5JWK - HAM Radio and ATARI Archaeologist 6003 Archwood San Antonio, TX 78239-1504 (210) 657-1549 (210) 884-6926 (210) 657-1549 gharmon at idworld.net "Retirement = Every day is a Saturday except Sunday" http://www.grissomroadcoc.org From ron.k3pid at sbcglobal.net Mon May 8 18:42:46 2017 From: ron.k3pid at sbcglobal.net (Ron.K3PID) Date: Mon, 8 May 2017 17:42:46 -0500 Subject: [Hallicrafters] SX-115 Needs In-Reply-To: References: Message-ID: I just checked on the bidding place and didn't find any SX-115 knobs however you better get some quick! There is a very nice looking SX-115 that they are asking $1500 for.... I wonder if anyone actually pays that kind of money for vintage rigs with or without knobs... Ron K3PID From wa6aaj at gmail.com Fri May 19 20:45:04 2017 From: wa6aaj at gmail.com (wa6aaj at gmail.com) Date: Fri, 19 May 2017 17:45:04 -0700 Subject: [Hallicrafters] SX-88 Dial Glass Message-ID: <591f918d.884dca0a.b7e1f.e247@mx.google.com> Hello to the Group. Another long shot request. I am looking for the Bandspread dial glass. Please reply off list with price and picture if possible. Thanks Mike From jh7hc at juno.com Tue May 23 16:29:43 2017 From: jh7hc at juno.com (jh7hc at juno.com) Date: Tue, 23 May 2017 20:29:43 GMT Subject: [Hallicrafters] SR-400A RELAY Message-ID: <20170523.152943.29540.1@webmail11.dca.untd.com> Looking for a source to replace vox relay k 202, P&W KN4272 in SR-400a. Tnx, Joe ____________________________________________________________ 1 Simple Trick Removes Eye Bags & Lip Lines in Seconds Fit Mom Daily http://thirdpartyoffers.juno.com/TGL3131/59249bfba35721bfb32e6st01duc From 1oldlens1 at ix.netcom.com Tue May 23 16:51:45 2017 From: 1oldlens1 at ix.netcom.com (Richard Knoppow) Date: Tue, 23 May 2017 13:51:45 -0700 Subject: [Hallicrafters] Voltage Chart for the SX-115 In-Reply-To: <15b1b9838ef-6e31-2a2ad@webprd-m26.mail.aol.com> References: <15b1b9838ef-6e31-2a2ad@webprd-m26.mail.aol.com> Message-ID: This is actually an important question. In some instruction books there is a note about the meter used but not always and sometimes it takes some detective work. For instance, the Hammarlund SP-600 has voltage charts that used a 1000 ohm/volt meter for DC and a VTVM for bias/avc measurements. The VTVM is not specified but was probably about 10 megohm. The readings made with the 1000 ohm/volt meter are significantly different from those you will get with a 20K ohm/volt meter or a VTVM. Because the source resistance of these circuits vary one to the other there is no constant correction factor. However, if you use a 20K ohm/volt meter you may be misled into thinking some of the voltages are too high. I have an old military meter that has both 1K and 20K ohm/volt divider strings, which is sometimes helpful with older equipment. If there is no note about the meter type or specs you may have to measure with both kinds to see if one is consistently right and the other wrong. In some cases, like the AVC and bias lines, one MUST use a VTVM or electronic voltmeter with very high input resistance in order to get any sort of reading that makes sense and not disturb the line. In the case of some sets I use a Hewlett-Packard 410-B with its 122 megohm input in order not to disturb the voltages. Rider's and Sam's are partly reprinted from manufacturer's data and partly made up by the publisher so they can be more confusing than helpful. On 3/29/2017 12:43 PM, Jammer via Hallicrafters wrote: > Just wondering about those charts; the voltages listed were taken > with, f'rinstance, Simpson 1000 ohm/volt meters? IIRC. What is the > difference between those voltages and what you see with 'moderne' > analog or digital meters? -- Richard Knoppow 1oldlens1 at ix.netcom.com WB6KBL From zengmeiste at aol.com Fri May 26 17:39:30 2017 From: zengmeiste at aol.com (Jammer) Date: Fri, 26 May 2017 17:39:30 -0400 Subject: [Hallicrafters] 1000 ohm/volt VS 20K/volt VTVM voltage measurements In-Reply-To: References: Message-ID: <15c46b33ca3-4ccb-17463@webprd-m18.mail.aol.com> Richard Knoppow said (emphasis mine): readings made with the1000 ohm/volt meter are significantly different from those you will get with a 20K ohm/volt meter or a VTVM aHa!, I thunk so, thanks mucho for the confirmation and clarification, Richard; s'good to have these factoids on hand. Thanks! 73 de Terry Bakowski KC9KEL, on-air someday From artleb at earthlink.net Fri May 26 18:01:03 2017 From: artleb at earthlink.net (Art Lebermann) Date: Fri, 26 May 2017 15:01:03 -0700 Subject: [Hallicrafters] 1000 ohm/volt VS 20K/volt VTVM voltage measurements In-Reply-To: <15c46b33ca3-4ccb-17463@webprd-m18.mail.aol.com> References: <15c46b33ca3-4ccb-17463@webprd-m18.mail.aol.com> Message-ID: <6B6F54A8520E482CB1DBE7CA173F9893@Arthurone> For that reason, I have an old 1000 ohm/volt military surplus VOM in my test equipment collection. Art Lebermann W6REQ -----Original Message----- From: Jammer via Hallicrafters Sent: Friday, May 26, 2017 2:39 PM To: hallicrafters at mailman.qth.net Subject: [Hallicrafters] 1000 ohm/volt VS 20K/volt VTVM voltage measurements Richard Knoppow said (emphasis mine): readings made with the1000 ohm/volt meter are significantly different from those you will get with a 20K ohm/volt meter or a VTVM aHa!, I thunk so, thanks mucho for the confirmation and clarification, Richard; s'good to have these factoids on hand. Thanks! 73 de Terry Bakowski KC9KEL, on-air someday ______________________________________________________________ Hallicrafters mailing list Home: http://mailman.qth.net/mailman/listinfo/hallicrafters Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Hallicrafters at mailman.qth.net List Administrator: Duane Fischer, W8DBF ** For Assistance: dfischer at usol.com ** This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html --- This email has been checked for viruses by AVG. http://www.avg.com From 1oldlens1 at ix.netcom.com Fri May 26 18:29:02 2017 From: 1oldlens1 at ix.netcom.com (Richard Knoppow) Date: Fri, 26 May 2017 15:29:02 -0700 Subject: [Hallicrafters] 1000 ohm/volt VS 20K/volt VTVM voltage measurements In-Reply-To: <15c46b33ca3-4ccb-17463@webprd-m18.mail.aol.com> References: <15c46b33ca3-4ccb-17463@webprd-m18.mail.aol.com> Message-ID: The problem is that the difference depends on the resistance of the circuit. For very low resistance circuits there is little difference but when the resistance is high the difference can be considerable. In the SP-600 even the B+ will read a little differently for the two meter resistance values. I can't remember if it was Hammarlund or someone else that specified a Weston voltmeter for the measurements. It took a lot of searching to find that particular model and its specs. Turned out to be 1000 ohms/volt. The lower resistance divider string can be used with a less sensitive meter (i.e. cheaper) so was very common. 20,000 ohms/volt meters began to be popular about when television sets showed up because they were necessary in order that the meter not disturb the circuitry too much. Around the late 1950s some very high resistance meters came on the market; I have a Simpson 269 VOM with 100K ohms/volt for DC. On the higher ranges this can be higher than a typical VTVM but I don't like it much because of the layout of the scales. My most used meter is still a Triplet 630A. On 5/26/2017 2:39 PM, Jammer via Hallicrafters wrote: > > Richard Knoppow said (emphasis mine): > > > readings made with the1000 ohm/volt meter are significantly different from those you will get with a 20K ohm/volt meter or a VTVM > aHa!, I thunk so, thanks mucho for the confirmation and clarification, > Richard; s'good to have these factoids on hand. > > Thanks! 73 de Terry Bakowski KC9KEL, on-air someday -- Richard Knoppow 1oldlens1 at ix.netcom.com WB6KBL From ron.k3pid at sbcglobal.net Sat May 27 15:43:36 2017 From: ron.k3pid at sbcglobal.net (Ron.K3PID) Date: Sat, 27 May 2017 14:43:36 -0500 Subject: [Hallicrafters] 1000 ohm/volt VS 20K/volt VTVM voltage measurements In-Reply-To: References: <15c46b33ca3-4ccb-17463@webprd-m18.mail.aol.com> Message-ID: <36EACDBCCE334A039BB827A30FBD2AC4@Zeus> I always used the rule of thumb that if you were measuring a source that was delivering significant power than it didn't make a lot of difference but if you were trying to measure grid voltage it could be a huge problem. And of course everything in between... What one needed to think about was "is my meter loading the circuit?". Ron K3PID

This page last updated 29 Jun 2017.