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*Hey Pat,* What good fortune to find you here. On behalf of many, thanks for your photo essay on the https://pmanning.smugmug.com/Electronics/HPDymec-2401C-Integrating (

I have also a set in the repair queue. My 2401C sounds to be a bit older than yours, Terry, as it's the Dymec-labeled version, s/n 622-01154. The 2410B is 644-01052, and despite having a lower serial

I believe they are fairly rare. I have one, as yet untested, along with what I believe is its successor, a 2402A. The 2402A works but is beyond its calibration range, so I need to dig into it. I hope

Dan, Yes, thank you. I was mistaken about the input impedance. The 600 ohms is the output impedance of the internal signal source, can be also set to 50 ohms. The input side on the left is 100K ohms.

Hi Mark So to get you started firstly you say the manual you have is not good most of us use ARTEK manuals as our fist call for a PDF as the owner is one of us and is recognised as doing good scans HP

Hi group. Have this coming and see quite a few references to (at least) the 8350B. Anyone have interest in helping me repair it? Symptom is very low output below 10GHz and next to nothing above that.

Hi, This is probably a common problem... I have a stash of nice HP probes but without grounding clips or grabbers. My challenge is identifying and finding the right corresponding accessories (I'm a

On 12/13/19 7:14 PM, Ovidiu Popa [Business] wrote: > Ok, so if everything fails, I will try building a 54717A calibration plugin. > ? > I found in the 54720A service manual the 54717A schematic. The

Ok, so if everything fails, I will try building a 54717A calibration plugin. I found in the 54720A service manual the 54717A schematic. The signal path... doesn't exist! It's only two coax cables

Who here, runs these find beasts? My HP 2401C Integrating Digital Voltmeter (SN 811-02807 opt 21,31,146) and HP 2410B AC - Ohms Converter Dymec (SN 644-01126) are about to be restored, interconnected

Re: Connect 8903B to an audio amp Victor: Some things.... * The input impedance of the 8903B is 100K if I remember correctly. * The FLOAT input can be used in your amplifier does not have a common

Hi Jeremy, In case there was an comms issue sending a PM to sell your plug-in adapter for the 5360A, my e-mail address is terry.waihi@.... If the item is out of stock then ok, I will just keep

Sorry you missed out on that one... wrote:

And to add insult to injury, while I was struggling to fix the power supply, a 54717A was sold on EBay :(

You can judge by bridge rectifiers diodes. They all get hot. I think it is 15-20 amps for +5v rail and 5-8 amps for +20v rail.

A friend is looking for a low voltage transformer and I have two of these from not economical to repair units that were parted out. Looks to be hefty. 73 Glenn WB4UIV --

Glenn no idea on the current. But you may be able to get a hint from each of the power supplies that use the transformer. Most HP supplies have over current limiting. Use .6V and dived by the current

Why do you want to know? Are you trying to find a replacement or planning to use one in a ifferent application? Roert G8RPI.

Thanks Mark.? Yes, I realize that, I have two 500W resistors mounted on a large heatsink. I will be testing NAD 2200 and 2600 amplifiers --Victor

Yes, you are correct, but the 8 ohm or 4 ohm load has to be rated for high power, especially if it is only cooled by ambient air. For a 10W amp we use a 100W non inductive restive load. You also need