Yes, I forgot about alc, which I also don't use.
- Paul
At 11:52 AM 7/25/2013, Jim W7RY wrote:
And provide the ALC voltage. If you donâ??t use
ALC (which I don't) then you can remove them.
73
Jim W7RY
-----Original Message----- From: Paul Baldock
Sent: Thursday, July 25, 2013 10:41 AM
To: Ed K0KL ; amps@contesting.com
Subject: Re: [Amps] L4B Caution
I suggest you remove the bleeder resistors. They serve no purpose
other than to speed up the bleed down when you turn the amp off. They
create a lot of unnecessary heat in the supply.
- Paul KW7Y
At 10:32 AM 7/25/2013, Ed K0KL wrote:
I had a bad experience when working on an L4B
for a pal. The bleeder resistor mounting
scheme proved to be a little poor (unusual for
Drake). When reinstalled, one of the resistors
shorted to the mounting screw.
This bleeder is held in place by a screw that
goes through the center of the resistor. Mica slices
insulate the ends (chassis and screw head).
Only thing is the resistor arced through the ceramic
base material. So I used glass tape to
insulated the screw on the reinstalled components. This
provided better spacing to the center of the screw.
Note- I replaced the resistors, having the same
thing reoccur. Only with the use of the tape did
the thing calm down. Ordinary electrical tape
won't work as it will melt caused by the heat of
the resistors.
Anyway, that was some time ago, the amp is
going strong. Except for a rather weak plate
transformer, this puppy will no doubt last several lifetimes.
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|