> In an old 5CX3000A 1.6-32MHz amp I am working on,
> the plate blocking caps are rated at 8KV. Can I
> guesstimate from this what plate voltage was intended?
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I have worked on FM broadcast transmitters and Henry HF
amplifiers using the 5CX1500A and B series tubes. If you
want information about any of said, I can supply it.
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Henry made (IMO) a dog of an HF amplifier using this tube,
for a short time it was popular in Elcom Bauer and Sparta
FM Broadcast Transmitters. Probably other brands used it.
-
The Sparta 602 is a long lasting unit running a tap selected
output,high voltage supply is used to set the output power.
>From memory the thing would easily honk 2200 plus watts
out on 95.3 Mhz a big 24/7 .
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The tube can be rebuilt... I was told the A&B versions are a
bit different, which includes separate socket requirements,
but actual direct swapping worked in two VHF examples.
-
Gas is a big concern... I would give it at least an two to four
hours warm up after a slow ramp to the rated min filament
voltage. Depends on how long it's been idle.
-
This tube seems more sensitive to proper heater voltage than
any other I've worked with. I would never apply screen voltage
without something near the proper min anode potential.
When its going full tilt, it is an incredibly bright light source.
-
Let me know if you need information from the paperwork I
have here.
-
cheers
skipp
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