No do not increase the bleeder resistor values, that would allow the "choke
input" voltage of .9 times the supply voltage to climb to 1.4 times the
voltage acting like a "Cap input PS" and possibly do some amplifier damage.
If you did that you'd see a 1000V plus swing on the plate supply voltage
instead of rock solid.
From: email@example.com [mailto:firstname.lastname@example.org] On
Behalf Of email@example.com
Sent: Thursday, June 28, 2007 2:27 AM
To: firstname.lastname@example.org; email@example.com
Subject: [Amps] Re-2: Henry 3K Classic stby. Input Power?
Thank you all for the answers!
I could explain about 400w idle but forgot the 200w from the bleeders. I
find that quite a lot. Is it wise to increase the value of the resistors or
is it better to keep them and be lucky of a warm shack in winter (and a
sweaty op in summer...)?
Karl-Arne: First I measured the ac input with a very cheap
"pliers-amp-meter" (hope this is the correct translation) and u x i gave me
about 800w ac input. The second measure was with a adaptor for the ac line
that took care of cos(phi) giving the more realistic 600w.
Anyway I enjoy the amp (especially when looking at my new and unused Eimac
3cx1200a7 as a spare part in the shelf ;-)
-------- Original Message --------
Subject: Re: [Amps] Henry 3K Classic stby. Input Power? (27-Jun-2007 11:23)
> Are you sure that you are measuring "active power (= U*I * cos (fi))"
> in standby?
> The power factor of an idling capacitor input power supply can be quite
> ----- Original Message -----
> From: <firstname.lastname@example.org>
> To: <email@example.com>
> Sent: Tuesday, June 26, 2007 3:21 PM
> Subject: [Amps] Henry 3K Classic stby. Input Power?
> > Hello,
> > I bought a used Henry 3K Classic with one 3cx1200a7. The amplifier is
> > working great and I am very satisfied with the quality of it. The output
> > power is very good and really sufficient (1.5kw). What surprises me is
> > AC input during standby: 600w! Has anyone an idea if this is normal or
> > there is a problem?
> > Many thanks for every hint and 73's!
> > Markus, DL4SEQ
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