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Thanks very much, Adrian ! I have one of those new-fangled SS amps - a 2.5kW PEP out unit from Onder at VK-AMPS. Very nice on CW and SSB, but it doesn’t have the ability to run decent power out on

Thanks gents - the below was awesome. If you have any other scientific papers/references on tubes, please post the links. Many thanks. John VK6JX

The FL-2100B primary taps can be easily set for 234v operation. Although not specifically indicated in their wiring diagrams, it can be done. I have my FL-2100 wired this way... works great. See the

A Chinese tube never does from filament issues no matter??what amp they are in and what the filament voltage is. ?It will die from a G-F short or some other issue long before it dies from any

Somewhere is all the messages my question spawned; Adria Fewster posted a link to a Richard Measures, AG6K (SK), article about modifications to a Kenwood TL-922

That would have been it Hal! Mod-U-Lator, Mike(y)/W3SLK From: [email protected] [mailto:[email protected]] On Behalf Of HaL Mandel Sent: Thursday, October 19, 2023 10:04 AM To:

Dear Mike, Some years ago on the Amps @ Cont...Com forum, mention was made on methods of limiting thew inrush current to transmitting tubes and I believe to remember someone suggesting to run a

You know, this discussion of filament voltage and tube life just prompted me to why I originally joined the AMPS group and then consequently leading up to this group. The pieces finally fell into

Yes, in the good old days when transformers were cheap, People who ran the 2100 amps used an auto transformer, to cut the voltage to 230V. In the generations that followed, as those amplifiers were

In regard to seasonal line voltage changes, this is a very real issue ?in areas where houses are fed with unground utilities, like?developments.??Several houses?will be connected to pad mounted

Recently looking at a FL2100B that I wanted to switch over to run on 240 instead of 120. ?Going to the manual tor switching the line voltage you’ll notice that a range of input voltages are offered

I would not recommend? using a BIG? 240 vac variac to run the entire amplifier.? You will end up with poorer V regulation.? ?The peak current on the 240 line, every 8.3 msecs will make you gag.?

Jim, you comment: ## In the OP's case, if no room for a 5.0 vdc regulated supply, the 75 ohm @ 5-10 watt resistor in one leg of the 240 vac primary will work (or a 0-100 ohm, 25 watt rheostat).

Hey, that's great news Dave! That "VTX-X101" tube was Alpha-RF's "house brand" tube, and (as you discovered) they were supplied by Penta Labs. It is essentially a 3CX1500A7 copy. That date code would

I replaced the tube in my Alpha 9500 with an Eimac 8877. This tube produces 1500 Watts with less drive than the previous tube required to produce 1300 Watts. Turns out the original tube that was in

## For directly heated, thoriated tungsten tubes like? expensive 3CX-3000 / 6000 / 10,000? triodes, or 4CX-5000 / 10,000 / 15,000? tetrodes,? ?I'm 90% convinced that the grid to cathode shorts

A new? Eimac? 8877? is now a whopping $4250.00? USD,? as of last week, from? MFJ / Ameritron.? (which is gonna be a helluva lot more than that anywhere outside the USA,? like 36% more in

Thanks Reid and Jim for the clarification. Does the same procedure apply to the Oxide Cathode tube when setting filament voltage? Jim – KR9U _________________ Hold on a minute there

Hold on a minute there Jim, thanks for quoting the book I edited at one point in my career. The text in C&F refers to Thoriated Tungsten filaments, it has no relationship to oxide cathode tubes such

This whole thing comes up from time to time. Meanwhile this is a completely useless thing to try in a ham radio setting. This information was Intended for broadcast use where they try to stretch life