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Spent a good amount of time yesterday studying available caps and Nichicon documentation. Came across this: https://www.nichicon.co.jp/english/products/pdf/aluminum.pdf Section 2-9 "Life and

Probably not a factor in this case, but in some cases we have found that metal film resistors (of the same value/wattage as the original carbon comp resistors) would blow open when exposed to high

Just a note: I have it on good authority that the inventory that was in the building Stan was leasing has been moved, sold, or something. It all went out of state, so I've heard. I have reason to

Our stuff season is getting its last additions today, there's still one hard to find 149-0035-00 fan motor (465/475), some blue CRT filters, and some interesting Tek internal bits including a 2335/6/7

You need to read the group Wiki. I suggest the one on the nanovna-users group. DaveD -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

John said: This is very sad news. Do you know which one of the brothers it was? Sad to hear, they have been very helpful in the past with reasonable prices and good shipping practices. I hope the

That is probably a miss-memory. What the designer in GE was talking about is a layer of contamination that boils up to the surface of the normally highly emissive cathode material. When the layer

In receiving tubes, that "interface layer" is called Cathode Interface, and is very true. Look it up. -Chuck Harris Nenad Filipovic wrote:

Nothing can be made 100% reliable as a daily driver, so no, your 485 might break, and it might need an expensive repair. If that is your only consideration, go with something new. The 485 is a nice

Take a look inside of your 453A, make note that gold is almost $1900/oz, and tell me, with a straight face, that it is only worth $5-10 in a not working condition. Even a broken jug has $5 worth of

Hi Tom, wow fantastic this nanoVNA, I saw that there is also a V2 version, maybe I will buy it, but I didn't understand how to use it with my SA (maybe using it as generator ?). -- Cheers, Attilio

Jared good work! We found the old Bourns trimpots (cermet) are the best, and avail in 3, 5 turns besides one turn. TEK sampling plugins are interesting but difficult to get working. Used units can

If the "interface layer" theory was true then the same negative resistance phenomenon would also be observable in conventional tubes. Personally I've never seen one behave like that, although I curve

Thanks, but that doesn't solve my request. The 1A7 manual shows the original pre-amp with 4 Nuvistors, and not the modified pre-amp installed in my 1A7 version as described above.

Well, after replacing a couple faulty trimpots (it looks like they were already replaced with some cheap rubbish in the past) it seems to work as well as I can measure on my TDS210 and HP 34461A.

Depends on what you need to do. Completely inadequate if you need to take data with a computer. I used one for years doing ultrasound preamp and power amp design work. 2 channels right there on the

Hi Maurice, These contain no proprietary ICs (no ICs!). The only sort-of unobtainium parts are the tunnel diodes used in the trigger circuits. These scopes are highly repairable as long as the jug

Hi Maurice, I got my 453 for $10 and it turns out it was only needing a cleaning... I'd pass on a non-working one, unless it was (essentially) free, like mine. Phil

Hi Attilio, One other option you may wish to take a look at is the nanoVNA. It's small and portable, and for the price, it's hard to beat. I've done a lot impedance matching and filter tuning with it.

Hi Tom, thank you very much for the explanations, in fact I was looking for a TR502 Tektronix tracking generator but I can't find it, so for now I will have to settle for a noise generator NF-1000