[Amps] L4B Caution

[Paul Baldock]

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 don’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 at 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.
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>
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