Use a 9V battery, or two, in series with a 10K resistor, and a low current meter.. then test in the usual way. -Chuck Harris Victor via Groups.Io wrote:

Thanks Tom! I'll open it up and take a look. My fear is that it would be potted inside. It's definitely worth a shot!

Jason, be sure to include the same part for a 3L5 in your searches. I believe they both have the same board in them, and I'm almost sure the discriminator is the same. And before you give up, I'd

Albert, This afternoon, I was reviewing the measurement done yesterday and found a problem (intermittent connection) with the cable connecting the wave generator to the Q1430 collector. After repair

The boards are extremely cheap from JLCPCB, online quote. yahoo.com@groups.io> wrote:

Has anyone had a build of these made up and ten or so that they wish to sell? If not, is anyone interested in going in on a group buy (of unpopulated boards)? Thanks, Victor

Question #2 - does anyone have a 1L5 that is working you don't need anymore or one you are parting out? Thanks and best regards, Jason

Just to add some other flies for the ointment: When I first started my 547 HV repair project, my scope, which had sat idle for several years before I got it, would only run for 15 minutes before the

Hi John, thank you for pointing me to the world of oscilloscope washing, cleaning. I read about the experiences of others and the industry washing oscilloscopes with water. The hairs on my head

Victor, Previously I wrote "I did an easier and less risky test. F1437 tied to GND,...". Actually, with the signal between GND and collector, this doesn't help at all because of the high inductance

Hi Morris, Yes, the deflection factors, which I called the "gain of the CRT" is an inverse function of the high voltage, and I have taken this into account. It requires simple readjustments of the

hi Rogers thank for indications I will control the transistor Roberto

Victor, Today I did more waveform measurements. I always viewed the primary voltage and primary current ( A6302 current probe) waveform and each time I tuned for resonance. Last time I made a

Thanx Dan. Your response is exactly what I wanted to see. I very much appreciate your time in answering my question. Gary wrote: -- Gary Robert Bosworth grbosworth@... Tel: 310-317-2247

-- Gary Robert Bosworth grbosworth@... Tel: 310-317-2247

Hi Ernesto, I'm not surprised that the focus and astigmatism are still OK with reduced HV but don't forget that the CRT deflection factors will be affected by the HV which means the calibration will

Hi Gary, The Prescale Input contains a high-pass filter (R2368/R2466/L2362/C2362) designed to engage Input-Out-Of-Range at low frequencies that could cause false triggering of the U2350 prescaler IC.

I found this to look at Gerber files online .  I have not tried it. https://www.gerber-viewer.com/ Tom Bryan

I would also be interested in a couple of these adapters. I looked over the files at the link but don't have the appropriate apps to open them.

I recently purchased a 1L5 off of eBay and popped it on the bench and attempted to start calibrating it. 10KHz up seems fine, but it is completely deaf in the 50Hz-9990Hz range. On the oscilloscope