Shop now for fast shipping and easy returns! Aug 27, 2023 · Date 1 - 14 of 14 RF VTVM Substitute Jun 29, 2020 · The RF VTVM probe is needed when you want to measure AC voltages at a frequency above the frequency range of your VTVM without the added probe. IM Series Test Probe Kit. For this no need registration. The HP 427 Fet meter is pretty flat to 4 mhz but it has no isolation resistor so it will load an RF circuit worse than a Heath IM-11 on spec'd to 1 mhz with an isolation probe tip. The rectified value is the negative peak voltage of the waveform. The weak point on many of these meters is the AC/ohms-DC probe. I don't always see email from Craigslist. As well as Heathkit IM-16 & IM-25 Solid State VTVMs. Best Sellers VTVM RF Probe - Low Voltage - Heathkit IM and V Series Meters V-7/IM-18 Etc $30. If the site has helped you and you also want to help others, please Upload a manual, circuit diagram or eeprom that is not yet available on the site. The one featured here cost about $10 in parts and supplies, not counting the wire, which I scrounged. "A" is an adapter from type N to terminal posts. V. Oct 11, 2020 · N ow downloading free:TRIPLETT triplett 650 vtvm and 150mhz rf-probe sm Also known: TRIPLETT AND RFPROBE 650 VTVM 150MHZ 150 MHZ RF PROBE RF-PROBE If you have any question about repairing write your question to the Message board. Dec 10, 2025 · Heathkit "Solid State VTVM's" the IM-16 and IM-25. As this probe is designed primarily for RF, signals below 1000 cycles will read low and the rectifier in the VTVM should be employed by turning the selector Aug 25, 2016 · The Simpson 311 VTVM is similar to the Eico 232, although the construction of the Simpson is more robust. 5V, 1V, 5, 10V, 50V & 100volts DC ±3%) Direct probe, 20hz to 50Mhz probe and RF probe from 1Mhz to 250Mhz. AC or RF voltages in excess of 30 volts should not be measured, as damage to the crystal may result. I use a vinyl grommet where the coax enters the tube. I've also heard that such a power meter can be more accurate, if an oscilloscope is available for calibration. In an rf probe, a diode is built directly into the probe. Smoke Grey is very similar to the HP Smoke Grey 410C early enclosure, Light Grey is the original HP color. Some Refurbished / Restored & tested w/ 90 day warranty. The fixed ground lead of the WV -98C insures good connection to the circui ©2023 by David B Smith 11 MEG impedance (1 MEG in probe) ClovIs CA DC voltage range 6 (0. panel where the test leads exit through grommets. The kit instructions were somewhat helpful, although I was doing some steps out of sequence. The connector uses a male type N connector and a recep­ tacle for receiving the probe. QUICK INDEX Amateur Accessory Gear 6 Automotive Electronics 7 Eicocratt Kits 4, 5 Home Security Products. New or Original HP, with new-fabricated-in-house blocking capacitor (3000pf) assembly and probe. I use a 1/4 inch stereo (tip-ring-sleeve) phone plug with the ring unconnected to give a little extra insulation between the probe tip and the instrument ground. 99 Brand new in packaging. Jan 1, 2023 · Pictures schematics and other information on electronic kits like Heathkit - EICO - Allied Radio and others. The probe is quickly adapted to either dc measurements, or ac and resistance measurements by means of a bui t-in switch. 7 MΩ in an RF probe used with an 11 MΩ input impedance VTVM. This loads down the circuit being tested, practically eliminat-ing the possibility of any induce Dec 3, 2014 · Most of the many probes I have made were RF probes, and probably bigger than you are looking for in a standard resistor probe. At low voltages you can also use a high-impedance bench DMM for DC measurements and the input impedance will be much higher than any VTVM. Aug 9, 2023 · PK-3A RF Probe Question 1 - 16 of 16 1 Aug 20, 2016 · The demodulator or "RF probe" in its simplest form is a probe with a diode and a capacitor arranged to turn the radio frequency into an audio frequency that the audio amplifier can use. ±10% max 70 volts NOTE: WHEN IN USE GROUND CASE TO BUILDING GROUND FOR SAFEY DO TO METAL ABOVE 70 VOLTS USE BLUE PROBE AC/DC 250 500 VOLTS CASE Used & Vintage electronic test equipment for sale. VTVM W. Calibrated wattmeter to measure power consumption of equipment being An RF probe turns the RF signal into a DC voltage that can be read on the DC scale of the VTVM. Probe and cable shielded throughout its length to eliminate pick-up from stray field. These VTVM's are quite affordable on Ebay without the probe. Heathkit IM-11, IM-13, IM-18, IM-28, IM-5218, IM-5228. probe as used with my VIZ, WV-98C V. Explore a wide range of our Heathkit Probe selection. W. The V. You get them all for $125. Kit and Wired EICO 147 Multi-Signal Tracer Two separate input channels assure maximum applicability iu both Il and audit) work. 00 for a wired and tested unit, to over $300. Please call or text. Jan 10, 2026 · Heathkit IM Series - Premium assembled test probe set. Color is smoke or light grey. Both the 232 and the 311 used the old Amphenol unbalanced microphone connectors for this probe. Jul 4, 2025 · Eico kits, pictures, specifications, diagrams, schematics Nov 12, 2025 · VTVM RF Probe - Low Voltage - Heathkit IM and V Series Meters V-7/IM-18 Etc Kent Craft LLC - KK4HXJ Electronics (18034) 100% positive This all results in more accurate readings. The VTVM RF Probes: Typical VTVMs can measure AC voltages into the low MHz range. Feb 13, 2020 · Page 5- Making an RF probe for VTVM Vintage Test Gear and Workshop Equipment Nose Cap Assembly for the HP-410C & HP 410B RF Probe. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Mar 29, 2025 · Heathkit of the Month - Table of Contents Listed are the Heathkits featured in each article. The vacuum-tube voltmeter (VTVM) has the same general fields of usefulness as the VOM, except that only a few VTVM's have provision for measuring AC current. The VOM and VTVM are unquestionably the most popu lar and the most useful service instruments. 5 MB Partial Feb 5, 2020 · Making an RF probe for VTVM Vintage Test Gear and Workshop Equipment Sep 27, 2016 · Basic Radio Frequency Voltage Probe A basic RF Probe for use with a digital meter or VTVM 9/27/2016 3 Comments This holds for all bands. ) I thought this might be handy for some of you fellow VTVM users for chasing radio frequency signal through tube radios. The dates below mark the first and last year of appearance for an item in printed catalogs, or price lists. with its 10MΩ input impedance. He probably scarfed them off a buddy and saved them to make RF probes :-) This probe is a RF probe for my IM-11 VTVM, using the circuit that's been in the ARRL Handbook for umpty-ump years. These are the ones I can modify based on the above link for the diy probe and downloadable manuals. The high impedance of the VTVM also allows the use of special probes. The button at the front rotates 180° to select either DC or AC/Ω. RF TEST PROBE KIT #309-C - $3. An RF probe allows your VTVM to measure radio frequency signals accurately. Has some information not found on other texts, like high-frequency and microwave radio, transmission line theory, and DC amplifiers. A shielded rf crystal demodulator as well as a direct probe are provided. 79 Panasonic - FC Series Capacitors - Individual Values and Kits 2. If a receiver is not functioning properly, the probe can be connected to the plates of the second detector and the amount of RF energy noted. Placement of an external shielding braid over the rf probe of a VTVM and the cable connecting the probe output to the VTVM. Feb 14, 2018 · Switch in probe housing provides for switching from direct to low-capacitance input, in “Direct” position probe measures up to 100 volts; in “Low-Cap” position, probe can be used to measure up to 500 volts or +56 db. One must be careful that the attached probes ar Get the best deals for Eico Probe at eBay. To the probe tip. For example, here is the classic Heathkit probe from my IM-11 VTVM. . If your probe can fit a regular occuring Heathkit VTVM on Ebay I would definitely be Heathkit kits, pictures, specifications, diagrams, schematics VTVM's vary in cost from about $25. Other kits in the line are often mentioned, and sometimes described in detail. One probe often required for alignment of ham gear is an RF Probe; Heath offered the 309 series RF probe as an accessory for their line of VTVMs. 50 A kit form RF test probe is available from the Heath Company. Click the "More Ads by the user" button, to see several more ads. For example, would you use one for checking the function of the oscillator circuitry? Bob Date 1 - 20 of 24 VTVM Model V1 - Probe Question HP 1120A Active Probe For RF circuits with an impedance greater than 50 ohms, a FET probe is very useful. 42 shipping Vintage Hewlett Packard HP412A Vacuum Tube Voltmeter 412A Find great deals on eBay for Heathkit Vtvm RF Probe. I am building a transistor VTVM and need a RF Jan 10, 2026 · VTVM RF Probe - Low Voltage - Heathkit IM and V Series Meters V-7/IM-18 Etc $30. com. You can RF TEST PROBE KIT #309-C - $3. 8, 9 Truvohm Multimeters 31 Test Equipment 12, 31 Industrial Instruments 12 Inverters 30 Probes 15, 17 VTVM's/TVM's 16, 17 Oscilloscopes . Find top brands, exclusive offers, and unbeatable prices on eBay. The manual shows extra probes to cover higher voltages and frequency. Compliments of Bruce Pollack. Connect the isolation probe to the ‘open’ end of the coupling capacitor, and the ground clip to the chassis. If you have an old Heathkit meter missing its probe, this is the exact replacement Jun 10, 2023 · RF and AF probe for VTVM, TVM, VOM , DVM and Oscilloscopes Homebrew Equipment Oct 4, 2013 · A brief study of the response of my crystal R. Mar 25, 2020 · However, I've heard that an RF probe, a dummy load, and a multimeter can be used to make a power meter. Another good text! MBLE BEM-002. Jun 28, 2022 · The third type of VTVM is the type with an RF probe on it, meant for measuring very high frequency RF voltages. 00. T. It requires an RF voltmeter or a VTVM with an RF probe. An RF probe turns the RF signal into a DC voltage that can be read on the DC scale of the VTVM. The bottom left is an IG-102 RF signal generator. accessory (formerly the Model 458A) allows the AC Probe tobeconnected to a 50-ohmcoaxial line. Fitting both the RG-58A/U and the Belden test lead wire through the shell of the 1/4 inch phone plug is a tight squeeze. RF Power Meter VTVM or Digital Multimeter RF and AF Signal Generator capable of emitting 00. 10, 11 Stereo/Quad Components. 50 + $42. This frequency limit varies from VTVM to VTVM design. Mar 27, 2023 · There are often questions here about RF probes for old Heath, Eico, and Knight signal tracers. How can one make an RF probe, and how does one use an RF probe for accurate power measurement? Jan 26, 2022 · Hello to All New to your forum and first time posting, I have recently repaired a ME-26D/U VTVM for my repair bench had this unit for years and just dug it Feb 4, 2020 · Making an RF probe for VTVM Vintage Test Gear and Workshop Equipment a small AC hum or RF voltage. This dual probe setup, serves as a substitute for the mostly missing or incomplete original test probe which used a switch at the tip of the probe to switch the Resistor in/out of the circuit. Equipment such as Oscilloscopes, Tube Testers / checkers, Audio AF Signal Sine Wave generators, VTVM’s, Triplett 630-PL and Triplett 310 VOM’s, VTM’s, Transistor Testers, Vari-AC’s, Dummy Loads, Power Supplies and more, by B&K Heathkit RCA Eico, Fluke, Micronta, Simpson, Triplett The next step was to reinstall and reconnect the Amphenol 75-PC1M chassis connector for the probe, and re-mount the lower support bracket. I also completed another switchable VTVM probe for the IM-13. I still have to construct and install a battery eliminator for the ohmmeter circuit. 1uV to 5 volts across all frequency ranges Oscilloscope with RF probes Dummy load with ranges across encountered transmitter power outputs RF carrier deviation meter/RF modulation meter Manuals, Service Notes, Brochures, and Data Sheets The historic rollout of Hewlett-Packard equipment is detailed below, along with our archive of equipment manuals, service notes, data sheets, brochures, and any available collector references. Apr 17, 2009 · I recently rebuilt a B&K 177 vtvm. This is an old model but still effective up to 500 MHz. My thought was to solder the resistor to the DC jack so I would have 1 probe for both AV & DC measurements. Feb 4, 2019 · Allied kits, pictures, specifications, diagrams, schematics This document provides comprehensive instructions for the Sommerkamp FT-277 SSB Transceiver, covering its general description, detailed specifications, installation procedures for… Oct 4, 2013 · RF Probe/VTVM measured RF in a GE, T143A, 5 tube AM radio receiver tuned to strong local station of 50kW, about 14 miles away: (Again, RMS voltage values, or really DC into the meter) 3. Let's briefly touch on the earlier Heathkit VTVMs before looking at the V-7A. Models prefixed by an “*” character use Also known: MARCONI TF-1041B AND RFPROBE VTVM CSVM TF1041B 25MV300V 1GHZ 1961 TF 1041 25 MV 300 GHZ 25MV 300V RF PROBE 25MV-300V RF-PROBE If you have any question about repairing write your question to the Message board. Jan 6, 2025 · $97. Their ability to show circuit-action data is exceeded only by the oscilloscope. 25 shipping The RF probe and VTVM may be used as a signal tracer and gain analyzer, as well as an RF voltage measuring device. Covers the basics of AC and DC circuits and radio propagation, then vacuum tubes and circuits that use them. Such probes are available but may be hard to find. 65 shipping Sponsored Hickok 1605M Solid State VTVM, with HP RF Probe $400. Various solid-state Voltmeters and VTVMs. More vintage VTVM. -100MHZ RFPROBE BEM002. Heathkit also offers another way to calibrate the meter if a 40-meter transmitter is not available. The jack is for use with some of the accessory probes Heathkit offers for their meters. The most common VTVM's have a plastic body probe with a switch for dc/ac-ohms that pops the 1 meg resistor in and out. This probe will permit VTVM usage for RF measurements up to 30 volts substantially flat from 1000 cycles to 100 me. 00 for some laboratory type instruments. To the right of the Eico 145A is a vintage Heathkit 1949 V4 VTVM. When used with a high-impedance DC Voltmeter, it can be used to measure RF voltage (and power), trace RF signals Dec 8, 2025 · VTVM RF Probe - Low Voltage - Heathkit IM and V Series Meters V-7/IM-18 Etc $30. also includes an RF Probe and a Brand New set of Test Leads. I Feb 9, 2010 · Do RF probes for VTVM's have much use for troubleshooting tube radios. Jul 25, 2015 · Next, use your isolation probe, and set your VTVM +DC voltage scale to ‘150’. Calibrating a VTVM at low frequencies against an RF Micropotentiometer at millivolt levels. 13, 14, 15 Generators 21, 22, 23 - KK4HXJ - Low Voltage VTVM RF Probe - for Heathkit IM and V Series Meters This includes the IM-11, IM-13, IM-18, IM-28, IM-5218, IM-5228 V-4, V-5, V-6, V-7 and V-7A Models and many other VTVMs which are rebranded Heathkit models which use a single Dec 26, 2005 · Hi testlab, which Heath VTVM will it fit, I am currently watching a IM-11, IM 13 and a IM 28. Sep 27, 2016 · For more information about radio frequency and other accessory probes that you can make (or sometimes buy) and how to use them, see the page on multimeters . The probe tip is mounted in the plastic cap. Apr 8, 2015 · Any probe you connect that outputs DC (as all detector and RF probes do) will need to also compensate for the 1 megohm resistor that would normally be in the end of the standard DC probe. 25 shipping Without that resistor at the tip of the probe, you'll end up dragging down whatever you're trying to measure, especially if it's part of an RF circuit. Have a Dec 11, 2015 · VTVM's without the isolation resistor in the probe tip will seriously load circuit at RF frequencies and not all VTVMs had isolation resistors. On the other hand, most of them can measure peak-to-peak voltage values and peak RF values directly, which is difficult or impossible with VOM. I enjoy working on tube type ham radio equipment and would like to buy a Heathkit vtvm. Dec 7, 2025 · Here is a Simpson Model 311 Vacuum Tube Volt Meter VTVM. 4. The low-voltage version is for typical receiver and transmitter measurements. Many popular VTVMs used a switchable probe: a probe that contains a one megohm resistor for DC measurements, and a switch to bypass the resistor for AC and Ohms measurements. M. Shop with confidence. I Jul 29, 2020 · The resistor would be 4. RF Probe PK-3 Schematic and circuit 114 KB description RF Probe PK-3A 85 KB Schematic only Scope Probe PKW-2 16 KB Schematic only Oscilloscope Probe PKW-101 697 KB Schematic and instructions Mobile Meter PM-2 Schematic and circuit 224 KB description Laboratory Power PS-2 Supply 43 KB Schematic only HV Regulated Power PS-3 Supply 1. F. Glad to find a group like this one. This loads down the circuit being tested, practically eliminat¬ ing the possibility of any induced voltage Date 1 - 20 of 23 HP 410C AC/RF Probe Dec 28, 2022 · Don't pass over the article just because it refers to a vacuum tube tester Main Menu Manuals for Heathkit Mar 12, 2014 · The original probes work, but they are rusted and need to be replaced. Using only 3 electronic components, it may rank as one of the simplest and cheapest homebrew projects. An easy solution to having to keep too many probes handy when using a VTVM. The RF Probe is one of the handiest accessories you can have around the shack. Nov 10, 2012 · Hi All Just joined your group. Low Voltage VTVM RF Probe - for Heathkit IM and V Series Meters This includes the IM-11, IM-13, IM-18, IM-28, IM-5218, IM-5228 and many other VTVMs which are rebranded Heathkit models which use a single 1/4" phone style probe connection The input capacitor is rated at 500 volts DC and the probe should not be applied to circuits where DC voltages higher than this are found. Same tube lineup, but the 311 also has provisions for an RF probe. 2-4700uF 25V/50V $1. However, many VTVMs have unshielded leads that can add problems during measurements. I'll be using the VTVM mainly for RF circuits so I'll take Rick's & your advice and solder the resistor as specified in the manual. pdf e and Cable. You can choose to instead use a resistor in line with the end of your new probe, or modify one, but if you still have the old probes I'd suggest just using the ones it was meant for. 100 MHZ RF PROBE RF-PROBE If you have any question about repairing write your question to the Message board. For plastic tubing that may work, up to 1/2" outside diameter, hobby shops usually carry polystyrene tubing in the model railroad section. I found the manual for it on the internet. 2 Laminated Self Adhesive Probe Labels and Clear Heat Shrink Tubing to cover the probe labels, resulting in a professional and durable setup (see photos). My old HP spectrum analyzers had a probe power jack, but now I use this power supply that I built. It can power all sorts of small amplifiers and accessories: Probe_Power_Supply. I have ALOT of test equipment for sale. This college-level electronics text is "designed for the student with only a limited background in physics and mathematics". They ALL work. - par-ticularly the RF Probe for measuring RF volt-age and the H probe for measuring voltages up to 30,000 volts. Magic eye tube and speaker provide both visual and aural signal monitoring. May 4, 2021 · A 100M 100X probe will work pretty well as long as the resulting voltage ranges and accuracy are good enough--and they probably will be at least comparable to old analog high-impedance VTVMs in the audio range. Essential for working on tube radios, vintage electronics, or ham radio equipment. First, let me describe my “homebrew This all results in more accurate readings. We would like to show you a description here but the site won’t allow us. It could occur in the test probe itself or in the open circuit, especially if th ecially on low-voltage ranges. (And yes, it works with my DMMs, too, and they actually appear to be a bit more accurate at very low RF voltages. Oct 11, 2020 · N ow downloading free:TRIPLETT triplett 650 vtvm and 150mhz rf-probe sm Jan 19, 2023 · * Looking for schematic for RF detector Probe for a transistor TVTM TVM Please post to this thread or website. If the site has helped you and you also want to help others, please Upload a manual, circuit diagram or eeprom that is not yet available on McGuire Scientific Services For the measurement of high-frequency ac voltage, an additional probe that is called an rf probe may be utilized with a VTVM. For example, in the V-7A VTVM article the VTVMs from the V-1 up to the V-7A and even some of its descendants are described. Jan 20, 2014 · Hi, Does anyone have the AC probe for the HP410C or any instructions on how to build a probe using a modern diode as a replacement to the tube one used in the original probe. AC hum or RF voltage. The voltage read is the RMS value of the RF voltage being measured. 100MHZ BEM 002 W. Heathkit kits, pictures, specifications, diagrams, schematics Nostalgic Kits Central Heathkit Test Equipment Matrix Manuals for Eico probes including VTVM RF, VTVM Peak to Peak, Scope Demodulator, Scope Low Capacity and Scope Direct. While the greatest number are general purpose, a-c operated types, there are many designed for special purposes, as well as many battery operated varieties. 00 + $39. The top left is an Eico fully rebuilt Eico 145A Signal Tracer. It could occur in the test probe itself or in the open circuit, especially if the circuit n low-voltage ranges. Sep 21, 2021 · The metal cigar tube probes were the RF probes, the very early model VTVM's and on the signal tracer. The value is chosen so that the VTVM reads the RMS value of a sine wave applied to the probe. 79 + $5. There are many examples of this, the HP 410 series, the General Radio 1800 series, Hickok 110B, 125, 203, and 209 and others, and so forth. 00 for an unassembled kit or $40.

skagbe0ho
3ewiiwf
5rmvdj8
vfvgm0
nwdbf
zpfll9
u2xlo
58welc
m4jptudxv9
2ckb26