Hi,
I have arrived in Europe and the L-7 seems to have made it without damage, at
least no visual damage.
The amp was wired for 220v when I had it in the USA. Upon arrival here, I
switched the USA AC plug for a European plug. But as soon as I turned on the
amp, the house circuit breaker
It looks like we have it working now, please disregard prior message.
73, Bill
--- On Sat, 6/5/10, Bill Dzurilla billdz@yahoo.com wrote:
From: Bill Dzurilla billdz@yahoo.com
Subject: L-7 blew circuit breaker when turned on, what's up?
To: drakelist@zerobeat.net
Date: Saturday, June
, Bill
--- On Mon, 5/31/10, Bill Dzurilla billdz@yahoo.com wrote:
From: Bill Dzurilla billdz@yahoo.com
Subject: Repacement for R12 fuse resistor on L-4B and L-7 power supply?
To: drakelist@zerobeat.net
Date: Monday, May 31, 2010, 3:04 PM
Well, I have determined that the
cause of my
Well, I have determined that the cause of my power supply problem is R12, the
.82 ohm 2 watt resistor on the B+ output of the power supply. It is visibly
damaged.
I have searched this list and elsewhere and it seems there is a split of
opinion on whether to replace R12 with a similar
Hello,
As you may know from my prior post, I have a homebrew 6m 3-500Z amp that I am
trying to get to work with a Drake L-7 power supply, so far without success.
The amp has an internal power supply, with the HV disconnected. I have the B+
of Drake p/s connected directly to the same spot
Hi,
The B- of the power supply for the Drake L-4B and L-7 goes to pin 6 of the
Cinch connector. Inside the amp, the B- is floated above ground by a one ohm
resistor. The one ohm resistor that floats B- above ground is said to be for
the purpose of plate current metering. I do not quite
in the military or civilian
schools!
Anyway, the resistor is near ground, (unless it opens!,) and so
connecting it to a panel meter is much safer than having the meter
connect across a shunt resistor somewhere up in the HV area of the supply.
73, Garey - K4OAH
--- On Sat, 5/29/10, Bill Dzurilla
--- On Sat, 5/29/10, Bill Dzurilla billdz@yahoo.com wrote:
From: Bill Dzurilla billdz@yahoo.com
Subject: Re: L-4B and L-7 power supply question
To: drakelist@zerobeat.net
Cc: k4...@mindspring.com
Date: Saturday, May 29, 2010, 11:26 AM
Garey,
Thanks for the reply. I still don't get
Hello,
I have a homebrew 6 meter RF deck using a 3-500Z tube. I was thinking I could
power it with my L-7 power supply. The big 8 pin connector appears to be a
standard Cinch connector. What about the High Voltage connector, what is that?
And where could such a connector be purchased?
73,
, 8:30 AM
Bill,
That connector is a standard Millen connector. They are available at RF Parts,
Upay (Ebay), and elsewhere.
73,
Evan
-Original Message-
From: Bill Dzurilla billdz@yahoo.com
To: drakelist@zerobeat.net
Sent: Mon, May 24, 2010 7:15 am
Subject
,
* polishing or totally removing the stator with the white traces,
* Carl's suggestion below to try a piece of insulation between the coil and the
cap.
Have not yet tried any of these suggestions, but please keep the ideas coming.
73, Bill NZ5N
--- On Tue, 5/18/10, Bill Dzurilla billdz@yahoo.com
Thanks, John. I noticed the black dot as well and it drove me crazy trying to
figure it out. After many attempts to duplicate, it turned out to be the rotor
on the Load cap. It disappears a moment before the arc because I was turning
that control to the left at the time of the arc. That is
Thanks for the reminder about the cooling, Evan. The source of the arc is
difficult to see in the video, but if you look through the plastic bubble that
forms the back side of the plate current meter, you can see the source of the
arc, in the Plate tuning capacitor.
73, Bill
--- On Wed,
Jim,
The arc occurred with a dummy load, so the antenna system is not to blame.
73, Bill
From: Jim Shorney jshor...@inebraska.com
Subject: Re: [Drakelist] Drake L-7 arc - plate capacitor
issue?
To: drakelist@zerobeat.net
drakelist@zerobeat.net
Message-ID:
All the amp gurus must still be recovering from Dayton.
Bill, you didn't
mention if you were testing with an antenna or a dummy
load.
73
-Jim
On Sun, 16 May 2010 09:19:35 -0700 (PDT), Bill Dzurilla
wrote:
I opened up the amp and everything looks OK, except for
one of the 25 or so
on 160m, but if my
theory is correct it would arc on 160 as well as 80.
The capacitor plates are not dented or deformed in any way.
So, do you think this is the source of the problem? If yes, is there any fix?
73, Bill NZ5N
--- On Fri, 5/14/10, Bill Dzurilla billdz@yahoo.com wrote:
From
Hi,
I recently acquired an L-7 amp and I tried it out today. I used my Pro II as
the exciter and an amp keyer.
I got 1250 watts out into a dummy load on 40, 20 and 15, and 1000 watts out on
10. My understanding from a Google search is that this is about right, as the
power supply is not
Anyone know where to find a soft start for the L-7? Jeff at Harbach told me his
L-4B soft start does not work on the L-7, and his universal soft start does not
work on either the L-7 or the L-4B.
73, Bill NZ5N
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