Evan and John,
Thanks for the responses,
I am not sure about the bleeders this is what the guy who sold me the amp told
me.
Where are the bleeders located? and as soon as the amp show up if you could
help me figure this out it and we will identify the harbach mod and then we can
see if there are any other mods that need to be done.
73
Bill
K9BUB
--- On Tue, 7/29/08, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
From: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Subject: Re: [drakelist] Drake L-4B
To: drakelist@zerobeat.net
Date: Tuesday, July 29, 2008, 7:45 AM
Bill,
I'm not sure which Harbach mod(s) you are referring to. There is a step-start
for the high voltage, step-start for the filaments, replacement rectifier and
capacitor board, and which sort of determines what else you might do.
When I rebuild supplies I replace just about everything except the power
transformer, and with components that have better ratings than the original.
One important mod is to replace the 5K 7wt resistor on the underside of the
supply with a 20 watt equivalent; your unobtainable ALC pot will thank you for
it.
I also place one or two fans on top of the supply. I use a model that is 220v
but will start and run reliably on 110v. It is so quiet you can't hear it and
it brings the case temperature down dramatically.
73,
Evan, K9SQG
-----Original Message-----
From: Bill <[EMAIL PROTECTED]>
To: drakelist@zerobeat.net
Sent: Mon, 28 Jul 2008 10:56 pm
Subject: Re: [drakelist] Drake L-4B
I just found out the the L-4B has the Harbach mod and the bleeder resistors
were removed to eliminate excessive heat.
Is there anything else I need to do to the power supply?
Thanks!
73 de
Bill
K9BUB
--- On Mon, 7/28/08, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
From: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Subject: Re: [drakelist] Drake L-4B
To: drakelist@zerobeat.net
Date: Monday, July 28, 2008, 2:41 PM
I would think 20A would be fine unless the run is long, then I'd opt for 30A.
Be aware that pin arrangements for the plug and socket change for the various
ratings.
Even if the PS is working ok with the amp, I always replace the 5K 7wt resistor
on the underside of the supply with a 5K equivalent, 20 watt rating. When the
original resistor fails, it takes out the ALC pot that also contains the
standby switch; these haven't been available for decades.
-----Original Message-----
From: Duane Calvin <[EMAIL PROTECTED]>
To: drakelist@zerobeat.net
Sent: Mon, 28 Jul 2008 2:34 pm
Subject: Re: [drakelist] Drake L-4B
I ran a 20A line for my Alpha 99. Works great.
73, Duane AC5AA
At 01:23 PM 7/28/2008, you wrote:
Just bought a Drake L-4B amp and while I am waiting for the amp to arrive I had
the electrician over. He wants to know what everyone is running for their 240V
line. 15, 20 or 30 amp service.
Thanks!
73 de
Bill
K9BUB
Duane Calvin, AC5AA
Austin, Texas
www.ac5aa.com
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