Discussion in 'Amateur Radio Amplifiers' started by KN4CTD, Jan 20, 2019.
That’s a good tidbit of information to know.
What... is your Spidey Sense tingling?
No tingling lol, but I’ve heard enough horror stories that I’m not getting my hands anywhere near anything that could possibly get hv onto or into it. I’m still leery using a hv probe even though I know it’s safe. I go by the both hands in your pocket rule!
With HV silicone insulated wire, DC would not be an issue. Induced RF would be something to be careful about, but amp experts could probably add good expertise here about that. I would get fingers anywhere near the tube. The wires can be extended out as far as you want. You could even put a socket on the back panel for it if you want. Another option would be to connect it to a battery, analog meter, and appropriate voltage divider and make yourself a temperature gauge.
As mentioned, infrared measurement can be tricky. Blackening the area you want to measure helps a lot -- just a spot of flat back paint will do it. I've found the laser pointer feature to be not so helpful and I just move it around to find the highest temperature area.
I totally agree with being very careful around HV!
Thanks for all the suggestions everyone. I’m giving up trying to measure temperature using this method. I might get some indication sticks and try it again one day. I painted the head of the bolt in the center black....still shows really low temperatures being driven by 100 watts and tuned for max output.
I have two spare tubes with coolers also......so itll probably never really matter no more than I use it. I get more satisfaction from using the dual gi-46b amp I put together in that yokogawa chassis.
I checked the fan speed taps....I stated that I thought we had moved to the high speed tap but I’m wrong. According to the manual, it is on the medium tap. I’m gonna move it before I put the lid back on.
Moved the fan to high speed. It’s pretty loud like that but it should be moving more air now.
What did you say?
Can't hear you over the blower noise.