ht ran across this item on eBay with a low starting bid. I would have bid but I own 4 LCR meters now, including a Genrad Digi-Bridge. If you would like a good accurate digital bench LCR meter, this w
Will, I believe Chris is talking about converting from a PI network to a Pi-L network. The Pi-L having two levels of impedance matching, and a little more harmonic suppression, than the original Pi n
Nope, he's talking about adding some inductance between the plate and the tune-C, making a kind of "L-Pi" (or L-Pi-L!) network. The idea is that with very high plate load impedances it may be impossi
For an L you need the capacitance on the high-z side. ** In this case the tube side would be the high-Z side. It would be the plate capacitance of the tube itself. The capacitance should be from plat
Has anyone bothered to consider the fact that the peak plate voltage is divided by the number of turns of wire in the choke, and you don't ever want that 'volts per turn' number to exceed the insulat
A 22 uH air coil choke can be wound on a 1/2" diameter form with a length of about 2" using about 22 - 26 gage wire. If I recall, it takes about 90 turns, but don't hold me to that. That sounds a lot
I've sure changed a bunch of those orange boogers which was burnt in two too! The Z-28 was YELLOW, not Orange. I have seen the Orange ones and they were larger and for a different frequency. Regards,
I am in the process of developing a means of notching plastic rod for coil spacing retainers using my shopsmith, cuts a notch in 1/4"rod to half thickness about 1/8 inch apart. This will give with #1
This may be an oversimplification on my part, but it seems to work. When I am trying to determine the Input (C1), Output (C2), and Tank Inductance for an amplifier, I consider the circuit to be actin
Dennis, When I worked an example for 1.8MHz I got reasonable numbers for C1 and L but C2 was 10x higher than what the PI-L program yields. If you divide C2 by Q it is about right. Tomm Tomm, That sou
Anyone out there willing to give this test procedure a try? I am at work right now and no access to a big PA to check this out. Standing by for test results! Tom, I have tried that a few times in the
For those that have tried the amplifier resonance test, the apparent shift in resonance most likely due to the change of input impedance shift of the input of the amplifier as you change the tune cap
In a message dated 2/23/05 11:26:25 AM Central Standard Time, g8gsq@ic24.net writes: I don't think there is much difference between a dummy load and antenna, that wasn't the thought behind my post. I
Upon opening up the unit. The two vitreous enamel resistors I used as plate fuses had melted and broke. Also, the large doorknob blocking cap had split open and was blackened. There was no other obvi
Costco® is currently selling an IR thermometer for <$70 that can be used for measuring the temperature of anode coolers. I have been using the Radio Shack one for about 3 years now and have found
Todd, This brings to mind another question I have always wanted to ask, and I believe that it is on-topic when we start talking about DC on 3-500Z tube filaments. If you power your filament with DC,
I appreciate your feedback.... But you never once addressed the problem with maintaining the proper BIAS in a multi-tube grounded grid 3-500Z amplifier when the tube filaments are series connected ac
I can't see it changing the temperature of the filament, but I can see that it will lead to uneven emission along the length. Steve Steve, My point exactly! Regards, Dennis O. _______________________
They are suited for single-frequency operation. The difference between 60% efficiency and 90% efficiency with the same input power is 0.3 S-unit or 1.76db. But for mobile operation, the difference in
I lost track of who said what/when; In a sine wave the average voltage is zero therefore average power is zero.In an ac circuit with sine wave voltage, average current is also zero. One could be led