Ham Radio : HP 410C VTVM, Solid State Multi-mode voltmeter,Overhauled, US $140 – Picture 0

Ham Radio : HP 410C VTVM, Solid State Multi-mode voltmeter,Overhauled, US $140 – Picture 1

Ham Radio : HP 410C VTVM, Solid State Multi-mode voltmeter,Overhauled, US $140 – Picture 2

Ham Radio : HP 410C VTVM, Solid State Multi-mode voltmeter,Overhauled, US $140 – Picture 3

Ham Radio : HP 410C VTVM, Solid State Multi-mode voltmeter,Overhauled, US $140 – Picture 4

Ham Radio : HP 410C VTVM, Solid State Multi-mode voltmeter,Overhauled, US $140 – Picture 5

Ham Radio : HP 410C VTVM, Solid State Multi-mode voltmeter,Overhauled, US $140 – Picture 6

Ham Radio : Hp 410c Vtvm, Solid State Multi-mode Voltmeter,overhauled

US $140

Cornelius, Oregon, United States
Mar 11th

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For Auction: Hewlett Packard 410C Vacuum tube Voltmeter , solid state version, (With HP RF Probe). Measurement Ranges are: DCVolts from 15mv to 1500v, DC current from 1.5ua to 150ma, resistance ranges are .2 Ohms to 500 Megohms, AC voltage .5V to 300V, AC Band Width nominally 700mhz. DC Input Resistance; 100megohm. Input Z: DC Voltmeter: 100megohm, AC: 10megohm, decreasing gradually with higher frequencies. .Refurbished unit. Extensive repairs to these units include; Original vacuum tube/transistor amplifier board ( A3) replaced with a 100% Solid State New Amplifier board. Low and high voltage filter capacitors cans re-stuffed with modern ( NOT NOS) electrolytic capacitors. Test leads replaced or repaired as necessary....cleaned, missing and corroded hardware replaced. Q1 (+6vdc regulator) checked and replaced as needed.. Meter face replaced if necessary. A7 ( power supply/interface) board and A6 board (calibration board) replaced with brand new PC boards. AC probe tube heater voltage optomized for the type of tube used . A7 (power supply interface board) is Brand New (new design). ( NOTE: The new design A7 power supply/ interface board is now a solder-in as opposed to the original "slip-on-connector" style) The original "slip-on connector" design was prone to a never ending set of interconnection problems. **** This is a solid state version of the HP-410C. Case repainted HP Olive . AC Probe repaired or replaced; this unit is equipped with a Genuine HP AC ( Active RF) Probe that may or may not have new TRIAX cable. ( See Photo). DC Probe is the stock HP style. (Replaceable needle point type). DC Zero control added to units that did not have that rear panel adjustment built in from the factory ( very small number). This unit has a brand new A6 (calibration) board installed. The new A6 board uses 15 turn Bourns trimpots. Calibration is smooth and with much higher resolution available as compared to the stock single turn HP potentiometers. External panels and meter "brow" re-painted : panels repainted Olive, meter "brow" painted Grey. Original HP carry handle has been removed and discarded ( we have yet to find one that does not have rusted fittings, making it unsuitable for sale). Computer style IEC AC cord connector installed. AC cord set furnished as part of sale. Unit is NOT checked for 220VAC operation. No photo-chopper to cause shakey needle, sluggish readings and heat related drift. No vacuum tube to cause drift and heat, No high voltage components to burn up. Warm up time basically the time it takes to warm up the AC Probe (about 25 minutes to thermal stability) Very low drift over time, low power consumption, no heat buildup, leave the unit powered up 24/7. All this and more with the solid state 410C. Unit is operational, repaired and calibrated using the HP Lab AC/DC Calibrator designed for this family of analog meters. A unit that is calibrated using the HP Calibration equipment will provide accurate readings vs units that are "Sold As Is". The instruments we sell receive a thorough disassembly, cleaning, repair and calibration. Resistance ranges are verified with 1% resistors. Serial Number of the unit you will receive is: 098A20539 PHOTOS: UNIT YOU WILL RECEIVE. This HP measuring instrument is lab-grade, easy to use and repair. They are rugged, accurate, have a design 100megohm input impedance; making them teriffic for low level signals and measurements that are not accurate unless very lightly loaded, (receiver AGC/AVC lines come to mind). They are just as useful in the ham shack ( helping to repair those great old boat anchor era electronics) as the lab or the classroom . The RF (AC) Probe (useful to 700mhz) is perfect for low level signal tracing in oscillators, mixers, and transmitter and receiver RF circuitry of all kinds. Someone pointed out that , technically speaking, this instrument is not a "vacuum tube" unit . True. However these units are referred to as "VTVM"'s or Vacuum tube voltmeters" because, at the begining of their lives, they did contain a vacuum tube. We decided to stick with the original description. ****** NEVER EVER ATTEMPT TO MEASURE AC LINE VOLTAGE WITH THIS INSTRUMENT, THE CASE IS AT AC GROUND AND DOING SO WILL DESTROY THE INSTRUMENT**** THERE IS A BRIGHT RED "CAUTION" STICKER TO THIS EFFECT ON THE METER BROW. The bulk of the cost of this instrument is the active RF probe,whether the HP or Militarized versions. The cousin of this instrument, the HP 410B, while not nearly as modern looking, has a design input impedance of 122megohms, ( and an active RF Probe as well) , making it a great lower cost alternative to the 410C. We custom fabricate the little "spring gizmo" inside the RF Probe, that is used to connect the tube top pin with the nose of the probe housing.( Occasionally these go missing.) We can supply replacement triax-cable when the HP triax on your instrument fails. *** For More Information, please contact us. We can supply BRAND NEW replacement **A6 , A7 and A3 board sets,** . as well as replacement meter face (scales) . Email for details** All electronics are shipped FED EX or USPS and, occasionally, UPS. USPS AIR MAIL PRIORITY on International USPS shipping. Teleporter Terminal available for our Galactic customers.Unit weight is 25 pounds. This is bare bones ( insured) shipping: Single boxing with insurance. If you wish to have upgraded shipping ( double boxing and insurance), please contact us*** Need this instrument shipped worldwide ? Contact us. PLEASE READ THIS ~~~~> *** Regardless of what the Ebay shipping calculator may calculate, or what Ebay May Tell you, do NOT send any form of payment until we have sent you an invoice for the sale *** shipping is ALWAYS calculated after sale. **** *** All Sales Final *** No warranties or guarantees expressed or implied. No returns, no substitutions. ***** We provide after sale technical and parts support ,via email, for all of the units that we sell and for all that are listed on our web page. Technical questions about vacuum tube test equipment, parts, repairs and usage ? Email us. We repair/refurbish : HP 410B,410C,Logimetrics RF Signal Generators, AUL Industries RF Signal Generators, HP204C, HP 204D, HP 209A, Cushman Service Monitors; CE3, CE4and CE4B, CE5 and CE6, as well as CE11 & CE 12. **** HP410C Overhaul Kits Available **** *** we buy 410C parts, dead units, bits and pieces **** We buy old dead 410C's , bits and pieces, in trade ****** Click the link below for direct email addresses. **** We can custom build a HP410C, with HP AC Probe, just for YOU **** *****Solid State conversion kits available, email us using the link below, for details. Upgrade your trusty HP410C "hybrid" to a solid state instrument. ****** http://members.ebay.com/ws/eBayISAPI.dll?ViewUserPage&userid=cornelius_connie

Condition:	Seller refurbished: An item that has been restored to working order by the eBay seller or a third party not approved by the manufacturer. This means the item has been inspected, cleaned, and repaired to full working order and is in excellent condition. This item may or may not be in original packaging. See the seller’s listing for full details. ...	Brand	Hewlett Packard
Type	Amp+&+Voltmeters
Model	410C
Manufacturer	Hewlett Packard
Country/Region of Manufacture	United States
Multimeter Type	Analog
Country of Manufacture	United States
Electrical Equipment Type	Test and Measurement
Technology	Analog