Test Equipment Anonymous

https://imagizer.imageshack.com/v2/800x600q70/922/WvgRnZ.jpg https://imagizer.imageshack.com/v2/800x600q70/922/a6fhoA.jpg I'm at home and the only picture on my phone is this which I took as a gag for some friends a few years ago. Head drum was 14400 RPM in NTSC land. Edited to add: And a reel of q...

This is the other 3400A that's available locally: https://www.facebook.com/marketplace/item/1239086987633247/?ref=search&referral_code=null&referral_story_type=post&tracking=browse_serp%3A7aebcd1e-27e6-4aef-b5da-c742ffe0e3f1 They want $150 Canadian for it but claim to be open to offers. ...

I have 3 and a half HP3400As. All have the IEC connector. They all have the photo chopper and nuvistor input stage. I believe there were production mods to replace the nuvistor with a FET input stage and the photo chopper with an IC chopper amp. Three work nicely and agree. The other, I can't quite...

Welcome back. I'm sorry to hear there have been a succession of "it never rains but it pours moments"; we can all sympathise. Sometimes life is plodding along quietly, there's a big bang, and then it takes time to settle into "the new normal". I hope you can find some distractin...

Holy crow. I'm still around. I've been so swamped lately that I haven't even been lurking though. 2025 finished up hectic but ok for the most part. Apart from a ton of work and indoor football starting up in late fall, I had two short road trips to the US to visit friends which were both good althou...

Unfortunately Ozzy has given his last "Fuck You". Kudos to Sharon for sticking with him through thick and thin. https://imagizer.imageshack.com/v2/xq70/922/39TEIM.jpg https://media.cnn.com/api/v1/images/stellar/prod/gettyimages-93351549.jpg?c=original&q=w_860,c_fill/f_avif Now Hulk Ho...

The HP 211AR's still sitting apart on the bench waiting for me to get back to it. I did finally get to the store and picked up fuses and fuse holders so hopefully a power test will be possible soon. I'm very curious to see if you have symmetry issues like I did. Same here - that’s the million dolla...

Here's some random Saturday Heathkit test equipment that I took pictures of for someone: https://imagizer.imageshack.com/v2/800x600q70/923/lGCB64.jpg https://imagizer.imageshack.com/v2/800x600q70/923/YnwtbY.jpg The HP 211AR's still sitting apart on the bench waiting for me to get back to it. I did f...

Batten down the hatches, turn on the A/C, and stay the hell inside. :shock: https://imagizer.imageshack.com/v2/xq70/923/sNWOdv.jpg https://imagizer.imageshack.com/v2/800x600q70/922/LTbNOm.jpg The air conditioning ran flat out here until about 3:45 AM. It's been cycling since, now that the heat's fi...

I hate it when I'm sick during vacation time. I did recently discover that under UK law, you can claim back the holiday days, and book them as sick days instead. Obviously this is only viable if you get full sick pay (I do), with no waiting period I'm not sure if it's Canadian law or company policy...

I hate it when I'm sick during vacation time. I did recently discover that under UK law, you can claim back the holiday days, and book them as sick days instead. Obviously this is only viable if you get full sick pay (I do), with no waiting period I'm not sure if it's Canadian law or company policy...

Here are the pictures from the very quick visual inspection of the HP 211AR from this evening. https://imagizer.imageshack.com/v2/800x600q70/924/vkVNDc.jpg https://imagizer.imageshack.com/v2/800x600q70/923/5NYVSV.jpg https://imagizer.imageshack.com/v2/800x600q70/924/4OMm2y.jpg https://imagizer.image...

It's amazing how a case of the flu can wipe you out and put you in bed for days at a time. Whatever I caught completely obliterated my days off between shift rotations and I'm still not fully recovered. Anyways, I did get some bench time before heading to work tonight. I did a quick check on the CE ...

To us techs on the production area these 8000A's were "the Bomb". The "bees knees". Greatest thing since sliced bread. We had never seen or used a small and compact DMM with LED's. So all these many years later I wanted one and then found out what a piece of crap it was. This wa...

Look more closely, especially at the other side of the connector (with Fluke blue shroud reinstalled) and see there is a shroud made of - wait for it - perforated card?! Involuntary shudder, as I remember Bulgin connectors. Bulgin plugs. Memories of Quad ESL 57 speakers there. Anyways, the Fluke 80...

Look more closely, especially at the other side of the connector (with Fluke blue shroud reinstalled) and see there is a shroud made of - wait for it - perforated card?! Involuntary shudder, as I remember Bulgin connectors. Bulgin plugs. Memories of Quad ESL 57 speakers there. Anyways, the Fluke 80...

Test set up: 2465 set to 50 ohm input. 75 ohm output on the generator. Why hp chose 75 ohm is a mystery to me. The results. Drum roll..... So the symmetry issue is finally fixed. All that's left to do is calibrate the frequency dial. There are adjustments for each range so it should fall into place...

Hey Mike - if you want to get the correct counter to calibrate your square wave generator, there's one on The Bay of Evil now! https://www.ebay.com/itm/306299652398?_skw=hp+524+nixie&epid=19064607187&itmmeta=01JV5BA7JF33H4JGDMAE4TY854&hash=item4750e1c92e:g:W8cAAeSwmIdoImXB&itmprp=en...

MED6753 wrote: ↑Mon May 12, 2025 7:02 pm Calibration was a bit fiddly but finally fell into place. Will burn-in for at least 2 hours then this project is complete.

Oh no it isn't! Not until the spectral purity of that sine wave is checked out on a spectrum analyzer!

Mike, IIRC my 523D was working when last I powered it up - want to borrow it? ;) https://photos.smugmug.com/Electronics/HP-523D-Electronic-Counter/i-NcvQQdn/0/LT68vGN2VDjgbWq9WsJNNb9jhF63mL96ZKCWhTWv4/XL/HP%20523D%20front%20view-XL.jpg https://photos.smugmug.com/Electronics/HP-523D-Electronic-Count...

I broke down and ordered two CE Manufacturing multisection capacitors, the 30/20/20/20 uF at 525 V that's a drop-in replacement for the can that's found in different Dynaco amplifiers. I'm debating back and forth between doing the Dynakit Stereo 70 that I've got plus one Mark IV, or both Mark IV amp...

Yesterday was a long, exhausting day but I did end up making contact with the lady selling the HP 211AR so I ended up heading down to the Niagara peninsula to pick it up after work. It was being sold along with some other test equipment and ham radio gear by a silent key's widow. We ended up enjoyin...

It's been a slow morning at work and I was browsing around on Kijiji and came across a sales listing for an HP211AR which is the rack mount case version of the same square wave generator you've got not far from home for reasonable money and I just messaged the seller now. Hopefully it's still availa...

If it is indeed an Astable Multivibrator then it definitely has an issue because the output should be a square wave and depending on the frequency selected it's a pulse which becomes more of a square wave at the highest frequencies. I'll wait until I get a new 6C4 and see what happens. I doubt the ...

Question for you smart guys. Is that circuit an Astable, Monostable, or Bistable multivibrator circuit? Depending upon the correct answer it may be functioning properly and the problem lies further down the circuit path. From my quick read of the theory of operation in the manual, it sounds like it...