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- เผยแพร่เมื่อ 12 ก.ค. 2015
- I have been thinking of building a HF linear amplifier for some time, now I have most of the bits it may actually come to fruition...
I said at the end that I left a few bits out, I didn't show the grid current meter or the clamping diodes that connect the HV -ve rail to the chassis.
Lovely video. I understand a bit more about rf tube bias when explained well.
Thanks you for sharing > Great presentation OM, many 73's
An excellent informative video thanks Steve !
Thank you Sir, Very informative. They way of your presentation is also quite pretty. Hats off to your sir.
شكرا ⚘️كان عندي مشروع استبدال الصمامين طراز
I've got 1 of those valves, have yet to make an amp with it yet, but it looks promising. Have you made yours yet? if so, how does it perform?
good show
very istructive and easy way to understand how a valved amp works but its not really that easy .pay attention to High voltage risc .beginners may burn before seeing the neeedles raising . always shrt cut condensers before use ...they remember always their charge ...lol .tahk you so mach sir .best 73 .best wishes for all radio amateurs .CN8BHA .
My boyfriend just got a grounded grid amplifier schematic tattooed on his arm.
If i use 807 , is there any combining bethwen anode and catode?
Triquint make an RF transistor that runs linear from DC to a few dozen GHz, but they want roughly £680 each for them, and the USA legal limit or something respectable would take 12 or more. I looked at using this particular valve, when I obtained a pair of very old US Navy anode supply transformers that put out 6200 volts CT. Unfortunately the primaries are 105-120 volts AC 60 Hz. I have two of them, so running the primaries in series could work with 230 volts. I used MOSFETs on the primary to dial back the anode voltage. I am trying to use the UK terminology, for VK6CS's sake. I bought a USA made 8877 from an eBay seller in France, and that gave me a lovely output of 1500 watts peak effective power, with the plate voltage dialed back, or the drive power dialed back. Honestly, I am not 100% sure if the primaries on the anode transformers are 95-100-105-110, or how exactly those are wound, to be absolutely certain. I know the previous owner was running three 3-500ZG Chinese tubes. His power supply, was a rather spooky affair. Eventually his wife demanded he dismantle the thing and sell of the 3600-4000 volt anode supplies, lest he or one of his children get into it and light themselves up like the proverbial Christmas tree. I twisted up some coils using seamless extruded copper tubing, which I silver plated using a DC power supply, and some silver plating solution. You wind coils to rival mine! I made VHF jammers when I was back in primary school, and my classmates and I drove the local tele salesmen to madness at the local department stores with them. We would jam all the channels but two watch the salesmen run about changing channels, and then jam those channels. Then we would watch the frantic fun begin all over again. Or range was only about 15 maybe 20 meters. Great primer on making a linear amp! I have been considering buying some old Soviet valves! Now I see one being used! Superb, mate. CHEERS, 73 KI7AQJ Arizona.
How connect a grid current meter ? Thank you.
As soon as I can get an area set up to do videos, I will be showing step by step
I am concerned that your bias diode needs to carry 700 mA at 15V. What diode number will handle that amount of current/power?
What about a 4CX5000A and forced air cooling.
figure on 3800-4kv and 30-32v bias . at that voltage cathode impedance will be about 35-40 ohms . legal limit with ease .. not sure you are going to make it at 2800v . I built using pi input I have messed with a couple of them nice tube . like a super heavy duty 8877 . be sure to run them with filament and blower for 24 hours minimum as with any nos tube . have seen a couple that I couldn't get rid of gas and found there was rust inside
What is this sorcery?
класика