Marc,
I agree with Lee. Low input voltage. Mine shows 2700 volts running
from a 240vac line after rebuild. What do you see in the cw/tune
position, lower by the same percentage?
Rick
W9WS
On Feb 20, 2012, at 11:00 AM, drakelist-requ...@zerobeat.net wrote:
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Today's Topics:
1. Re: low plate voltgage l4b (kc9...@aol.com)
2. Re: low plate voltgage l4b (Dino Papas)
----------------------------------------------------------------------
Message: 1
Date: Mon, 20 Feb 2012 11:16:17 -0500 (EST)
From: kc9...@aol.com
To: hs0...@gmail.com, drakelist@zerobeat.net
Subject: Re: [Drakelist] low plate voltgage l4b
Message-ID: <8cebe021be02ba4-1cb4-1a...@webmail-d062.sysops.aol.com>
Content-Type: text/plain; charset="utf-8"; format=flowed
Marc,
What is your line voltage?
73,
Lee
-----Original Message-----
From: hs0zju <hs0...@gmail.com>
To: drakelist <drakelist@zerobeat.net>
Sent: Mon, Feb 20, 2012 10:53 am
Subject: [Drakelist] low plate voltgage l4b
I recently aquired a l4b. I upgraded the ps and soft key with harbach.
I turned the amp on in ssb with no load and have 2400 volts. I did not
try and key or do anything else as i do not want to cause damage. I
believe i should have 2600volts.?
73 marc hs0zju
sent from galaxy tab 10.1
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------------------------------
Message: 2
Date: Mon, 20 Feb 2012 11:16:57 -0500
From: Dino Papas <k...@cox.net>
To: Mail List - Drake Gear Drake Gear <drakelist@zerobeat.net>
Subject: Re: [Drakelist] low plate voltgage l4b
Message-ID: <5f4823bb-0c60-45c9-9673-9cce13f9c...@cox.net>
Content-Type: text/plain; charset="us-ascii"
Marc - I just rebuilt the L-7PS with a Harbach board (and a L-4PS
with the Heathkit Shop board)....Both boards show 2700 volts on the
amp meters after putting them into operation.
Did you do a low-voltage test before installing? I applied a 20VAC
voltage to the input and got ~50VDC at the outputs verifying the
voltage doubler function.
You may want to give that a try....sounds like a part reversal
during install.
Dino KL0S
On Feb202012, at 1050 AM, hs0zju wrote:
I recently aquired a l4b. I upgraded the ps and soft key with
harbach. I turned the amp on in ssb with no load and have 2400
volts. I did not try and key or do anything else as i do not want
to cause damage. I believe i should have 2600volts.
73 marc hs0zju
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