Message-ID: <000e01c87bb4$427c6f00$0e00000a@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <000001c87a63$13267ea0$8700a8c0@rtv5f9d8dfdf44> <47C753BC.3060006@ukonline.co.uk> <004901c87abb$636f7120$0301a8c0@g3kev> <47C82E82.20200@ukonline.co.uk> <000901c87b17$0b094400$0201a8c0@ken> <47C89AA8.70805@ukonline.co.uk>
Date: Sat, 1 Mar 2008 15:52:11 -0000
MIME-Version: 1.0
Subject: Re: LF: RE: G3LDO 500kHz rig
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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" <g3ldo@ukonline.co.uk>
To: <rsgb_lf_group@blacksheep.org>
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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>