rk wrote:
> Augusto Yipmantin wrote:
>
>>Hi all,
>>
>>My name is Augusto, OA4CVT, I am making a 432 mhz cavity using a 4CX250B
>>tube from EIMAC.
>>At moment I have an HV power supply with 1700 to 2000 VDC working well,
>>it was made to drive a 3CX1500A tube for HF.
>>What I need to make is a 375 VDC regulated power supply for the screen
>>tube and 5V @4Ah for filament. Some people told me about the IP-32 power
>>supply for a Heathkit amplifier, but there is not information available
>>for this device.
>>May anyone help me to get a schematic for the power supply?
>>73 de Augusto, OA4CVT
>>_______________________________________________
>>Amps mailing list
>>Amps@contesting.com
>>http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>>
>
> I think the filament is 6.00 not 5 or 6.3..
A complete data sheet on the tube is on my web site - see
http://www.g8wrb.org/data/Eimac/4CX250B.pdf
At UHF, it needs to be lower than 6V. At 432MHz it should be 5.5V.
375V is a bit high on the screen too I *think*.
Check the actual Eimac data sheet, not what you see quoted here,
someone's web page, how Heathkit did it etc.
1700-2000V sounds fine, but again check the data sheet.
You also need a grid bias supply in case you were not aware of it.
Something around -55V seems to ring a bell, but again, check the data
sheet.
--
David Kirkby,
G8WRB
Please check out http://www.g8wrb.org/
of if you live in Essex http://www.southminster-branch-line.org.uk/
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