There are also notorious Chinese knock-offs which contain low-power (2N2222?) dice in what appear to be period-authentic packages. They'll pass the standard multimeter diode test, but don't survive

Thomas Garson wrote on 10/4/2020 3:09 PM: <snip> Hello-- In addition to deliberate process changes, some manufacturers reportedly labeled their parametric rejects as 2N3055s. The rejects met or

Greetings, On Friday last I was at the local surplus store, which is giving up after 30 years, and ran across a Fluke/Philips PM3350A scope in fantastic condition. I bought it for a modest

If your 2N3055s are in aluminum packages, they are likely Motorola or Fairchild fab, and will be epitaxial (high gain). If they are in steel alloy cans, they could be RCA, which would be hometaxial,

Hi Jeff, I took a quick look at the schematics. There's nothing in the circuit that demands extreme properties of Q1338, so a 2N2222 should function as a sub, although I'd probably use a 2N3904,

One thing to try is to press the beam finder in a darkened room and see if there is a slight glow from the CRT. I had a bad Y output amplifier which put the spot way off the screen. It cannot be

My project as of late has been refurbing a 475 I picked up in non working condition. I recapped the power supply and got my -15 back up with no ripple, still had no trace at all. I have HV, but

I worked at IOtech from 1990 to 1992. I'm not sure that software was ever taken beyond DOS. Steve HenDrix

Hi All, On the KO4BB site, the Dos version of the IOTech Analyzer 488 software is the only one available. I am looking for the Win 95/98 version, does anyone have it ? Regards. JJ

Thanks for that, guys. I have three old 2N3055 in my "junk box". One doesn't have a manufacturer's name but is also labelled 3055H and has (using my MK-328 transistor tester) what I assume is a beta

As David Partridge says, it's risky to pop in a modern replacement. It's not just a matter of gain (I assume you meant beta). The original 2N3055 was made by a now-extinct "hometaxial" fabrication

You want an old slow (low Ft) non-epitaxial 2N3055 for the HT inverter. David

This may be a little premature, but if the problem is a failed Q1195, it looks as if it a Tektronix-made 2N3055-family NPN power transistor. Tek show its part-number as 151-0140-00. The question I

There's not much point experimenting with other fixed resistors. Wait until you obtain the replacement pot. My philosophy is to minimize the amount of (re)soldering, to reduce the risk of damaging the

Raymond: The X1 pot is the pot that is bad. I left it in place an added a 390 ohm resistor, to correct a severely collapsed trace (less than 2 divisions). pdxareaid: i can experiment with other

The A sweep should be more than 10 divisions; it's not critical and normally reaches beyond the left and right edge (so, wider than the screen's width) after correct adjustment of the 'scope. If the

T912 F782 — picture of unlisted fuse - 1 photos · Updated Oct 2 https://groups.io/g/TekScopes/photo/254490/0?p=Created,,,20,2,0,0

On Sat, 3 Oct 2020, David Sidrane wrote: I would also want to purchase one. Where is it supposed to be ordered from? Who sells those? > Hi Chris, > > Did you ever order any of the 260-2500-00? I

Hi Chris, Did you ever order any of the 260-2500-00? I would like one purchase one. David

It wasn't, John. I saw the Seattle report. That was Seattle in 2014. This one I was st was Denver in 1973 at the convention center helipad. Greg