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Talking of wobbles , no wobbly bob
before operating as well !!
It would be funny if the NOV stated 100
mW max erp or some other qrp level
....
650-0-650 400 mA , too small , core will saturate
with FW bridge , the centre tap indicates the
core is 'small' as designed for half
wave .. will need over 40 mF smoothing at
those rates , if its single phase 50 hz , that's
4Kw pk
will need 1500-0-1500 1 amp oil filled ,
choke smoothing ? .. time to dig out the 1950 handbooks
G
Sent: Wednesday, December 19, 2012 10:24 PM
Subject: LF: Re: RE: MORE VALVES
Ken
The valve and base in the picture is a
4CX1500B that was intended for 137 Khz not 500 Khz.
At present both on 137 es 500 I am using solid state
Transmitters, which are probably safer. I do have a selection of Dentron
Amplifiers for the HF Bands with 8875 valves.
Watch those High Voltages, no margin for mistakes, one
Wobble and you Vaporise !!
73 es GL de Mal/G3KEV
----- Original Message -----
Sent: Wednesday, December 19, 2012 8:20
PM
Subject: LF: RE: MORE VALVES
Hi
Mal.
What valve are you
using? I am currently building a TX with a 6293 Beam Tetrode in the PA. the
building of the two power units has slowed the construction down with the
inter-linking control cables etc. The PA xformer is 650 ? 0 - 650 volts @
400mA with a bridge rectifier, the valve max anode voltage is 3Kv and anode
current 1.5A. I am hoping for Class C, 500 watts output cw on 472kHz (if we
ever get the NoV).
73.
Ken
M0KHW
This is a 137 Class C
amp project, but since CW activity has dropped to virtually
NIL I am not rushing to complete.
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