So _never_ connect the probe's GND clamps to any other level than the GND level of your radio. Another thing to remember to avoid damage to your computer and scope is that the scope's GND signal is directly connected to your computer and via the computer's power supply a connection to the earth potential of the mains exist. With the open end of this capacitor you can touch the interesting points in your radio, wait 'til the trace (that has jumped to the top) comes to the center again and stabilizes and then measure the AC while the capacitor blocks the DC offset (it charges itself to the DC voltage within seconds, so you should discharge it (easily done by touching the metal frame of the radio with the open end for some seconds) before measuring at different levels or touching by hand to avoid the painful (but not lethal) electrical shock. Another possibility for measuring smaller signals with a high DC bias (as usually found at the anode of the nice dusty tube on the left in your 2nd picture) is to create an AC coupling (that's unfortunately missing in the Hantek in order to spare some ct in production) by connecting a small (~10.100 nF) plastic film capacitor in series to the tip of your probe, this capacitor should have an operating voltage > 500 V to be on the safe side. For higher voltages a X100 probe can be used but these are expensive. Supplied with the scope are two probes that can be set to X1 or X10 mode, the later setting allows to measure ± 50 V signals (with ☓50 V safety margin). The input (at the BNC plug) shall never exceed ± 35 Volt to avoid degradation or damage. I started my electronic experiments many years ago with gear like this - been there, done that Just out of curiosity - what kind of measurement tools do you have at hand when working with tube radios? Regarding the Hantek scope, please keep in mind that the usable input voltage of Hantek6022 is limited to ± 5 Volt (voltages outside this range are clipped and the channel name in the bottom lines turns red as a warning (as seen in my screen shot some posts up). Find more unmissable deals now.Hi Raxis13, Nice historical radio, but due to high internal voltages also a bit dangerous. These chairs are trendy, comfortable, and come in many different colors and styles, designed to meet a wide set of customer preferences. Wholesale hanging egg chairs are also offered at amazing bargain prices. Shop at to find different models of wholesale aluminum folding chairs with webbing, including rattan chairs. Find other types of wholesale aluminum folding chairs with webbing, including wholesale lawn chairs, backyard chairs, and porch chairs. These featured products can be purchased at amazing prices here. Hammock swing chairs are popular for their amazing functionality and relaxation effects. Wholesale outdoor patio chairs can serve the same purpose as any other set of chairs. Outdoor tables and chairs are a great way for completing décor. Wholesalers on offer a wide range of aluminum folding chairs with webbing that come in various shapes and sizes. No matter your customer preferences, you can stock your business with reliable wholesale aluminum folding chairs with webbing when you shop at. Get bistro sets today at amazing deals, with awesome bargains on patio tables and chairs too. Alternatively, choose wholesale folding chairs outdoors for those who want to easily store chairs to create more room for other activities. When looking for recreational chair designs that can fit any garden, choose wholesale patio chairs. The different styles of aluminum folding chairs with webbing available here can enhance the appearance of a garden in different ways.
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