Hi guys;
I am busy with the repair of the above amplifier.
The tool has been destroyed by a lightning !
I have the full user manual with the original schematics of the equipment.
But the schematic does not correspond with what I see by opening the amplifier
for repair ?
Does someone nows if there are made some modifications in the past well none by
some radio amateurs ?
I think they are not realized by the means producted factory modifications
later(I think could be otherwise).
I saw on the 300VDC supply that there is added some 3 series diodes from this
power supply to earth and a supplementary output wire connection.
This wire has been come loose due the lightning but I can not find where it has
been connected in conjunction with my original schematic.
Because this part of the circuit is not on my schematic ?
The originally output of the 300VDC power supply is already connected to the
screen of the tube.
I have not any idee what this wire connection is,as function on my 300VDC
screen supply of the 4CX250B tube ?
If you wish I can sent you the original schematic with the add-ons I already
found behind the box .
Some resistance have also not the same value has indicated on the original
schematic.
I think by the release of this VHF amplifier,there is sure has been talking
around in a discussion group or a reflector.
And some guys have maby announced some modifications around the original
circuit concept ?
I think I have sutch amplifier in repair now,he operates before the lightning
superb !
Regards Jean ON4AEF.
ELECTRABEL NV/SA, 8 Regentlaan - Boulevard du Regent
1000 Brussel - Bruxelles, 0403170701, RPR/RPM Brussel/Bruxelles
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