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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