On Nov 16, 2006, at 9:26 AM, Robert B. Bonner wrote:
Hsu,
200 watts out, it sounds like he is not getting adequate RF drive to the
finals.
So why is there 500mA of anode-I?
Its been a long time since I've tuned up a KWS-1. The ones I
worked on (back in the 70's) were both 4X150 powered units, not 4CX250.
Does the unit make a KW with another set of tubes in it?
It sounds like with adjusting the bias you can draw current with the tubes.
But if the transmitter doesn't make RF drive it cant make output.
Could just be an alignment issue with the tube change. I don't have a
manual for that transmitter here.
BOB DD
-----Original Message-----
From: ham_amplifiers@... [mailto:ham_amplifiers@...]
On Behalf Of R L Measures
Sent: Thursday, November 16, 2006 3:32 AM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] NOS cermic-metal tube burn in
My guess is that the wattmeter is in error.
On Nov 15, 2006, at 4:58 PM, Hsu wrote:
Screen PS V=350V,
anode PS V=2kV.
they are in Collins KWS-1.
My friend have been burn in for 2 hours, the bias crrrent has
ben increase to 100ma, and can get more
(400-500ma) current, I think the tubes are good.
Hsu
----- Original Message -----
From: R L Measures
To: ham_amplifiers@...
Sent: Tuesday, November 14, 2006 2:20 AM
Subject: Re: [ham_amplifiers] NOS cermic-metal tube burn in
What is the screen PS V?
What is the anode PS V?
What Class?
On Nov 13, 2006, at 7:34 AM, Hsu wrote:
Hi, There are two Chinese FU-251F(4CX250B) cermic-metal tubes,
they
are new but storge for very long time. The output power only
200-250W( a pair), Could someone cal tell me how to solve this
problem?Is it means I have to drop them in the junk box?
73! Hsu
R L Measures, AG6K, 805.386.3734
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