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Now I'm not sure.? I'll have to go look and find out.? Was using a TDS540A, which should go to 500 Mhz.? I can switch to an active probe and see what goes on. Back after a bit. Thanks. Harvey

Steve many thanks very long time! Many thanks for the fast advise! Built 1972..1978 at least. Found three of my GenRad sound level meters to check it . Must fab a 1.125" to 0.500" aluminum cylinder to

Rogerio, R110/1/2/37 are stressed at 1/2W. Mouser has MFR200 types in stock, if you do not have 1 or 2W in stock. The 2W Mouser has is cheaper than the 1W types and the additional power capacity will

Perhaps input frequency is too high for your scope to show the sharp edges but otherwise sine wave is not expected at U329 inputs, it should look like a square wave. Do you see the correct waveform at

Rogerio, Beamfinder switch is a sore spot in a LOT of tek gear. Clean and lubricate if you even suspect a problem with it. On the 576 the "cal zero and invert" switch pack is a realy soar spot and

Thank you for teh replies. My board is the new model (670-4126-00). I have measured all the resistors, but without desoldering one leg and they all seem ok. I am suspicious of S1125 (beam finder),

Mercury batteries used mercuric (II) oxide. Mercuric oxide is toxic and can be absorbed through inhalation as well as exposure to bare skin. Not nearly as bad as dimethymercury (one drop even with a

Bonjour a tous, restoring a 1972 GenRad Sound Level Calibrator 1562-A https://www.ietlabs.com/pdf/Datasheets/1562.pdf Used to calibrate measurement precision mics like Sound level meters like Genrad

Assuming that's the same 'scope -- the one with the incorrect 18650 battery, etc. -- I arranged with the seller (assuming it is the same seller) last Saturday to pay an agreed amount of cash for it

We've investigated the claims made that a particular eBay user was a scammer and they aren't true. The message that was accusing the original seller of being a scammer has been deleted after

Note that the link is picked up by eBay and recognised as an auction which has ended - so "helpfully" a similar item is shown. You can get to the original item following the link at the top of the

That is believed to be the 'scope in question The original listing is https://www.ebay.co.uk/itm/294643654575 which gives more info. Some discussion suggests that the NVRAM battery has been replaced

I guess it depends on your motor and mechanical system. Most of the time you can't instantaneously change the motor speed so you want the speed to ramp up to your desired speed and then ramp down to a

Hi Leo, How is the progress in your 2465B project? Still interested in the production date of this Heerenveen 2465B. Greetings, Egge Siert

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