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1-2 hrs max...per tube.

Hello Cooking the tubes. It was necessary to modify the tube polarization system. As shown previously, the HT power supply is floating relative to ground. This trick allows the cathode voltage

I had a bad relay on my Al-811H and went this route. There’s a write up on DX World here: https://www.worldwidedx.com/threads/ameritron-al811-relay-headache-solved-my-way.265840/ I bought special

The AL1500 relay is a typical 3pdt 12v relay. ?There is nothing magical about it. ?There are many relays that can be subsidized for it if the original cannot be found. ?With Ameritron going out of

Try w8JI, CTR Engineering, he may have one. 73? Andy? K9ATX -- "Where the Old Soo crossed the

The output relay in my Ameritron AL-1500 needs to be changed. I checked with MFJ since they are still selling some Ameritron replacement parts, but no luck.? From the user manual, this is "RLY1" and

Here's an update on the SVHFS 2025 Conference; Deadline for papers has been extended to March 17 Registration is open; details are in the attached file. Thanks, Robin Midgett K4IDC

WRX, with 200w drive, how much grid and plate current was it running? Bob W4JFA [email protected]> wrote:

Which models had 4kv on the plate? A Triode is only going to give 10 to 12 DB of gain. Man, I have worked on and rebuilt pretty much all of these amps and even the later 3KA with its HD supply won't

The Tokyo High power HL2K? with 3-500s was also such a amp. It had proper cooling(fully pressurised) On 240 VAC it could easily hit 2KW pep even though it was rated for 1.2KW PEP. Much like the TL922

It’s a well known fact that the Ameritron AL80b can obtain 1kw output ?pep?with a single 3-500. They only run 3000 volts anode voltage. ?The old Henry amps made prior to the power rule change

Which henry amps were rated at 2kw out Jim? C ________________________________ Sent: Friday, February 14, 2025 3:29 AM To: [email protected] <[email protected]> Subject: Re:

Some versions of the older Henry amps were rated for 2 kw pep out on ssb.? But they also had improved cooling and also a bigger B+ supply. To getter older tubes, on the drake L7,? you can use the

Hi Mike I'll try that transformer thing when I get to that point.. thanks don

I would be interested to know how you interface the TOA amp to the modulator tubes in my case using a pair TZ40s? 73 Mike VK2AMF

Don, I’m not sure if you know this, but you can use the 70.7V output to drive a 600Ω input. 5K/10KΩ P-P to 600Ω transformers are usually available. Turn them around and drive the grids

Thats what I'm leaning towards now. Scrap the input with all those 12AU7s and do something else. Reverse engineering that circuit seems fruitless . Not sure it even worked when built. Took a look at

I would rip all the front-end tubes out and drive it with a 10W TOA amplifier. You can get these cheap on ebay and other websites. $20 to $30 bucks. They have 4/8 and a 70v output with balanced and

WOW.... thanks so much for the input. Let me try to answer some of the questions Oops....its not a 350 watt modulator its a 300 watts. The thing is a monster. Has 4 - 12au7s into a pair of 6146's

Sounds good. I have a HB rig with two 4-400s modulated by 304TLs. It runs 10 to 160. I have had it on 10 and 20 recently. Through a 4 elment mosley. Over 300 contacts on 10-meter AM. If you want to