I am also an original owner of a TT 425 export model. Same type of meter
readings since day one. Power supply is fed from a 240 VAC 40 Amp circuit with
number 10 conductors. I always considered the lower plate voltage readings
consistent with early Russian methods for calculating 200 W limit on their
amplifiers. Lower plate voltage reading would make for more conservative power
output.... HI HI !
Best regards,
Gary - AB9M
CSM(r)G.L.Huber
glhuber@msn.com<mailto:glhuber@msn.com>
www.csm-gh.com<http://www.csm-gh.com/>
9679 Heron Bay Road
Bloomington,IL 61704
(309-662-0604)
National Webmaster for:
The Society of the Fifth Division
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----- Original Message -----
From: Marcel Jorba<mailto:ea3in@yahoo.com>
To: tentec@contesting.com<mailto:tentec@contesting.com>
Sent: Sunday, July 18, 2004 12:30 PM
Subject: Re: [TenTec] Titan 425E caps
Thanks for all answers.
If this is all the problem, I will live it.
73, Marcel
--- Joe Giacobello <k2xx@swva.net<mailto:k2xx@swva.net>> wrote:
> I have precisely the same problem with one of my
> 425's and had also
> concluded that a meter resistor is the problem. I
> am also living with it.
>
> 73, Joe
>
> ac5e@comcast.net<mailto:ac5e@comcast.net> wrote:
>
> >Hi Marcel: My 425 also indicates 1.8 "Plate
> Kilovolts" on the front panel meter. I was
> suspicious when that started, about five years ago,
> since the drive wattage and Tune/Load settings
> remained the same for the same power output so I
> checked the actual HV out of the power supply.
> >CAREFULLY!!!
> >My power supply itself puts out 2,320 Volts when
> the plate meter sits on the dot between the numbers
> 1 and 8 in the 1.8 red scale. Running CW with 1500 W
> measured output the actual voltage drops to 2,230 V
> - while the meter on the Titan drops to just a bit
> to the left of the 1 in 1.8. I suspect a dropping
> resistor in the metering circuit, but I haven't been
> curious enough to tear my setup down to get to the
> circuitry. Too much work for too small a concern.
> >Now, I was suspicious for three reasons. Besides
> the fact that my logged settings for max output had
> not changed, local hams who can hear me very well
> and know my voice report NO AC HUM on my signal with
> or without the amplifier in line. And the final
> reason is that when the filter caps go bad there's
> usually a very substantial drop in voltage between
> no load and full load.
> >If you don't show a big drop in HV between idling
> and operating I would not worry too much about it.
> If it worries you find a calibrated high voltage
> meter or a probe that will work with a meter you
> have and measure the HV at the power cable at the
> back of the RF deck. And have everything hooked up
> and metering - AND YOUR HANDS WELL CLEAR - before
> you turn the power on! Failure to do this can
> result in a well done ham!!!!
> >If the HV meter agrees with the built in meter, you
> may have a power supply problem worth fixing. If it
> reads much higher than the built in meter you
> probably have a voltage divider problem in the
> Titan's metering circuit.
> >73 Pete Allen AC5E
> >_______________________________________________
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> >TenTec@contesting.com
> >http://lists.contesting.com/mailman/listinfo/tentec
> >
> >
> >
> >
>
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