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Another alternative us to just figure out which plate is bent and bend it back. If it's burnt and melted, use needle nose pliers to remove the plate it hits on the rotor side. As long as the amp tunes before the load cap is fully meshed, the missing plate didn't mater and it's removal will make...
I have no doubt the amplifier does the numbers you say and more. However, you can achieve longer tube life on an oxide coated cathode, by not undervolting the filament. This is because this type of cathode is dependent on reaching a high enough temperature to produce a protective Cloud over the...
If you can get the Chinese 3CPX1500A7 for reasonably less than you can get an Eimac 3CX1500A7, I might go for it. The reason is the higher breakdown voltages are exactly what this tube benefits from in terms of reliability.
This tube is noted for grid arcs and arcing between the cathode and...
If it's anything like the first version, Icom had zero ability to supply their authorized facilities with a single power supply component for the PW-1. If you couldn't Source the part from another supplier, you had to purchase a new Supply at approximately half the cost of the amplifier. The...
This is correct. I took the base off a 811 tube to repurpose the socket. Soldered three wires into the sockets filament and grid pins. These wires attach to a 3-500Z socket that has an outboard filament transformer to run the tube. As I recall I am using the 811A test and adjusted the load for...
Is the tube cracked? If not, it's likely not making a good connection in the socket. The M2057 is exceptionally difficult to find and I've never seen a tube tester with it listed. Although you can test them as a 6KD6, with the filament set for 12 volts.
It's worth mentioning the M2057 tube has...
This reinforcing clamp only limits flexing at the antennas first coupling joint. The weakest link, where any flex would be undesirable and cause the top of the fiberglass tube to split.
It's not long enough to remove flex in the sections above or below the coupling joint. Had the new...
I've seen that happen with a few of the old red door knobs that they used in Heath kits. There're not as good as the tan colored ceramic ones. I'm sure they didn't use anything quite as good here either. Not that it's required.
"Constantly needing retuning after a minute of no keying", sounds like a fixed value capacitor across the tune or load, is shifting in value as it heats. Not even sure if there is one padding that variable, but it is one of the few things that cause that symptom.
You're not going to like the answer. Your amplifier is oscillating. That is a typical problem with smaller Texas Star amplifiers, due to their bias circuit design, sharing an RF contact on the relay.
Those 3 amps of filament current, also give the 6KN6, a whooping 1.5 amps of peak cathode current! It has the widest oxide coated cathode of any sweep tube. I bought sleeves of these tubes years ago for $4.99 per tube. I've been using them ever since in every application from a single tube grid...
I think the problem has to do with the DC biasing on your first single-ended transistor driver. Since it is single-ended and NPN, I don't think it should be powered from the same split rail Supply that is feeding the complementary symmetry outputs. If I suspect what is happening is correct, your...
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