HP 3734A Electronic Counter 5 MHz 5 digit Nixie 1966 repair teardown

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I was a little bit delayed by the fact that there exist no free schematics or service manuals for this one, so if you have something like this ? please scan upload and share it, thanks in advance. This one is nice and clean now and is counting again, only a few minor details like digit 3 sometimes flip a 3 to a 5, and the max frequency is about 300 KHz, this is my number 62 Hewlett Packard video..
NOTE TO THE FUTURE : Always remember to open, and perform optical inspection, Before power on !
I found a new surprise inside, and got a bit angry, what the heck..
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#teardown
#hewlettpackard
#vintage
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I use auto generated subs, i am sorry there are a few spelling errors,
maybe one day they can do it better..
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(Thanks to all my Sponsors / Traders / Swappers / Sellers / Buyers, without your support and constant flow of cool items in/out, none of this would be possible)

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3 окт 2024

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Комментарии : 29

@NixieClaus 3 месяца назад

You will never ever forget the full inspection before powering units up.

@TeardownOZ2CPU 3 месяца назад

the best advise when testing / checking old unknown stuff, and also put an earth wire to the chassis

@IMSAIGuy 3 месяца назад

The HP repair site took the cards out and put them in a dishwasher. The internal design manual for instruments required the product withstand one dishwasher cycle using Calgonite soap.

@TeardownOZ2CPU 3 месяца назад

correct, you CAN wash electronics in a dishwasher, good idea to remove the salt, but it is also a hard wash that will remove some silkscreens and some component values, so i personally dont recommend to do it, i prefer to do it manually, this way i know what is going on, and can stop if it goed bad at a much erlier stage.

@IMSAIGuy 3 месяца назад

@@TeardownOZ2CPU you are right, probably ok in the old days when new, but now I like your hand wash.

@IMSAIGuy 3 месяца назад

oh, and I'm sure my wife would not allow it anyway :)

@TeardownOZ2CPU 3 месяца назад

@@IMSAIGuy we can also image the day we have 50 large boards and need to be done with it, I most likely end up with the dishwaster, but i do it a day my wife is not home.. no need for a funny argument

@TeardownOZ2CPU 3 месяца назад

@@IMSAIGuy dont ask, dont tell, it is not lying..

@domozs4370 2 месяца назад

All presented units so exotic in Poland before 1990...

@absurdengineering 2 месяца назад

Mega Muppet is a very apt term. I shall borrow it when the occasion arises :)

@TeardownOZ2CPU 2 месяца назад

I got it from a British friend, he use it all the time

@absurdengineering 2 месяца назад

@@TeardownOZ2CPUIt is really good. Instant chuckle. You rock!

@splitprissm9339 3 месяца назад

I learned to love old cal and inventory stickers... unless the case is in a condition where you want to take it to pieces and give it a shower of degreaser or even caustic soda based cleaner and will turn the stickers into a mess that still will be nasty to remove ;) White spirits (I think it's called Rensebenzin in Danish... love the word) tends to be good at getting unsightly stickers and glue loose...

@CraigPetersen12f36b 2 месяца назад

610-01020 = 1966, week 10 1020th unit. Nice old unit. Newer units use a slightly different scheme, for example, 1208A15088 is the serial number for my HP 400E. The first two digits '12' is the number of years since 1960, the next two, '08' are the number of weeks in that year, 'A' is the country in which this unit was built, in this case America, and the last set of numbers are the units production number. If I remember correctly, the serial number does not reflect the actual date the unit was built, but the finalization date for that production run.

@TeardownOZ2CPU 2 месяца назад

thanks for the serial system age explain will be handy next time i get an HP

@CraigPetersen12f36b 2 месяца назад

@@TeardownOZ2CPU No problem, keep up the great videos.

@byterock 3 месяца назад

The two neon bulbs are there to counter 'The Dark Effect' one is on all the the time, to keep the strike voltage of the blinking one constant.

@ludmilascoles1195 3 месяца назад

Never heard of that before, will have to read up on that

@jrkorman 3 месяца назад

Sort of remember that term somewhere in the distant past, but can't remember what it was used on.

@byterock 3 месяца назад

@@jrkorman I did a short video on it as a counter I was working on had the same card ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-BGEhT4Wtub4.html

@ludmilascoles1195 3 месяца назад

@@jrkorman yeah I was just reading about it, I found it in a 1950s textbook not much use for it since the transistor age

@DMahalko 3 месяца назад

Checking for failed / shorted capacitors at least in the power supply section should be your first plan of action before applying any power. Expensive test instruments are likely to have better caps than consumer goods but their electrolytics can leak and dry out the same as anything else. Otherwise in the first 0.1 second of turning on the power you may explode irreplaceable components and the thing is now dead.

@TeardownOZ2CPU 3 месяца назад

I keep adding reasons for a good round of looking, BEFORE power up old stuff :-) it is amazing what I have found of wierd reasons, the one you see at 5:39 is new and crasy !!

@splitprissm9339 3 месяца назад

I'm always paranoid about testing frequency counter accuracy with 10MHz (or what their timebase is) or multiples, especially if the timebase oscillator is not strongly shielded and well decoupled.... oscillators are known to lock naturally if they can...

@TeardownOZ2CPU 2 месяца назад

Yes that is possible, I should do a little follow up on this next time I have an old unshielded osc, in a counter, could be fun to see if I can prove this phenomenon