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Hi Toby, Please take the time to remove one of those A5 SMD-Electrolytics (Diagional Cutter preferred). You will be surprised. Greetings, Egge Siert

I purchased a very inexpensive 7B70 in as-is condition. On arrival, it wouldn't trigger and I traced the problem to the first Tunnel Diode, VR304, (a 10mA TD) in the Trigger Generator. It appeared

I was excited to actually use the TinySA for something, and it worked great on the high band but when I switched to the low band, it was showing what looked like a very stable pulse train across the

Jim, Check CR1372 and CR1379 for leakage. If leaky, replace with 1N4937. When one or more are leaky, it will give a too bright trace like you have. Also check the 22 meg resistor. It is likely out of

I have yet to check them out, but the waveforms I see are sufficiently identical to the ones in the manual, so I'm thinking they're ok. From what I know of the circuit: Inputs are conditioned, run

How about a wild shot from the hip...? There is a (I believe) 47 uF tantalum on the unregulated 15 supply located under the shield cover over the hv section. Maybe it is trying to fail? Regards

Quadzillatech is now banned

Hello! New guy here. I have a 475A scope w/DM44 that I bought not working maybe 15 years ago. Replacing one of the power supply filter caps fixed it then. It's been great for occasional use since

Nope:? 7D14 of which I have one, and 7D15 of which I have several. Very different critters, 7D14 is about 500 Mhz, but not so versatile.? 7D15 is about 200 Mhz or so, and does period, events, and

Barry, I was incorrect about the 7D15 using 0367 types. They use 0402. They are the same transistor with a different number stamped on it. They are most likely leaky from C to E. The 0402 is only in a

Harvey, If you mean 7D15 and not 14, check the 151-0367-00 transistors for leakage between C and E. The leakage will check as a diode. Checking hfe will give way off results like 0 or way high like a

I wouldn't have any second thoughts about using the 2445 as a parts mule for the 2465. The 2465 is just the more capable instrument. I'm still waiting on a new run of the RU800

I think that this IC was only produced in one plugin, and for only a particular run of serial numbers. I may have a problem with mine, I may not.? I'd be tempted to replace the whole board with an

I use my 7L5 not daily but certainly weekly, for audio restoration and repair, and I love it. Inspection of the spectrum of distortion products, and for FM MPX purposes for which it is ideal: checking

Dave, I was also bidding on a 1L5 at one point, and it also went for (what I consider) real money. The 1L5 is more of an antique than the 7L5, though the 7L5 is pushing 50. The TinySA meets all my

I have restored and own a few tek 2465 scopes, now have a decision to make and looking for opinions. I have an otherwise good condition 2465 with U800 failure - power supply recapped a couple of years

Mark, I'll try that. It could just be a "perfect storm" of several parts contributing to the failure. Regarding one of these plugins, one of the custom ICs has one bad output (the 2^0 bit) which

Couldnt agree more Siggi! Cell technologies are completely different, a backup battery needs to trickle a small amount of current over a very long time. 18650 cells are not meant for that at all,

wrote: Yeah, it's not about the circuit current consumption, it's about the self-leakage of the cell. It'd be a very special 18650 that holds any sort of charge for years - WikiPedia quotes leakage at

I don't consider the 7L5 to be an antique, certainly not when compared to the?851A/8551A and the early Tek/Nelson-Ross/Pentrix SAs. Got a chance to actually use the Tiny SA last week; I had to