Thank you, RB, for your response although it was a lot more windy than I had
wanted. Your comment about the Drake L-4B containing surge suppressor resistors
in the filament transformer is incorrect. As stated in my message, which you
included in your reply, the resistors are bleeder resistors. They have values
of 50K ohms each and are connected across the HV capacitor string.
John, N9JG
-----Original Message-----
Date: Sun, 8 Oct 2006 18:42:34 -0400
From: "RB" <K9RB@bellsouth.net>
Subject: Re: [TenTec] Centurion Amp Woes
To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
Message-ID: <072901c6eb2b$0c486530$0201a8c0@k9rb8c670f7e81>
Content-Type: text/plain; charset="iso-8859-1"
[snip]
The resistors that you refer to are surge suppressor resistors, typically
installed on the primary of the filament transformer, to "step-start" the
filament voltage for a few seconds to aid in prevention of the large current
surge from distorting the filament by delaying full power from the filament
transformer until the filament gets warmed up slowly with partial power
first upon turning the amp on initially.
[snip]
-----Original Message-----
From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
On Behalf Of John K Gotwals
Sent: Sunday, October 08, 2006 4:40 PM
To: tentec@contesting.com
Subject: Re: [TenTec] Centurion Amp Woes
[snip]
In addition to the two
3-500ZGs, my L-4B power supply has two series connected 50 watt bleeder
resistors which get exceedingly hot while the power is turned on, and I
would guess that thermal fatigue of these resistors might also be increased
by frequent turn-on/off.
[snip]
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