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Re: LF: RE: G3LDO 500kHz rig

To: <[email protected]>
Subject: Re: LF: RE: G3LDO 500kHz rig
From: "Graham" <[email protected]>
Date: Sat, 1 Mar 2008 15:52:11 -0000
References: <000001c87a63$13267ea0$8700a8c0@rtv5f9d8dfdf44> <[email protected]> <004901c87abb$636f7120$0301a8c0@g3kev> <[email protected]> <000901c87b17$0b094400$0201a8c0@ken> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]

Only 750 volts ! I was messing about with my spare (linear) pa from the trp5000 , with 1750 Vdc from a 400 hz inverter psu taking 45 amps from 26vdc .the psu was taking 6 amps from the mains ... .. after a few melt downs of the ht fuse , ive given up for the time being .. looks like the anode decoupling chokes do not have enough inductance to hold 500 khz back , the rf has even arc'ed through the ceramic case of a 20 watt wire wound balast to the mounting shoe and that was with 100 watts carrier power 25% of the max 'hf' output....

G ..

think ill start a qrp club hihi



----- Original Message ----- From: "Peter Dodd" <[email protected]>
To: <[email protected]>
Sent: Friday, February 29, 2008 11:52 PM
Subject: Re: LF: RE: G3LDO 500kHz rig


Ken M0KHW wrote
How many watts is the PL519 running?, I have some 807s I was thinking of
using, but they like 750 volts on the anode.

The PL509/519 is very rugged and will give far more power than an 807 at relatively low HT voltages. I run my PL519 at around 80watts output although it is capable of a bit more without exceeding the anode dissipation. The only downside is that the PL509/519 requires 40v for the heaters but I had a suitable transformer in one of my many junk boxes.

In 1998 LX1PD used a transmitter on 136kHz that used 16 PL36s in parallel. The PL36 was also a TV line TB valve.

regards

Peter, G3LDO




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