[Amps] DRAKE L-4 AMP - 'rewiring the ON/OFF switch"

[Stan Gammons]

Yes, that's a nice board which I have in my L-4B.  If I'm not mistaken
Paul, you designed the ES4L4B?  I went the external switch route before
I added the ES4L4B board.


73

Stan
KM4HQE


On 11/30/22 20:59, Paul Kraemer wrote:
> Or you could install ES4L4B board from Harbach.  Inrush current is less
> than 3 amps and it doesn't foul up a bunch of other wiring
>
> Plus you get soft key and bias voltage too!
>
> Paul K0UYA
>
>
> On 11/30/2022 8:47 PM, Stan Gammons via Amps wrote:
>> If the idea is to take the burden off the hard to find on/off switch, my
>> solution was making an external on/off switch using a box with
>> appropriate receptacle and a double pole toggle switch. I have the kit
>> to repair the L-4B switch, but expect I'll never need it since I leave
>> the power turned on all the time and power the amp on with the external
>> on/off switch.
>>
>> 73
>>
>> Stan
>> KM4HQE
>> a
>>
>>
>>
>> On 11/30/22 20:31, gudguyham--- via Amps wrote:
>>> I assume you want to use a 120v relay as a contactor to take the burden off the on/off switch.  There’s ALWAYS 120vac available on the same terminals the blower connects to.  NEVER use chassis ground for a neutral return.  Simply hook into the blower terminals for 120v AC. Shift the wires from the original on/off swith over to the relay contacts in the same configuration.  The CW/SSB switch is part of the on/off switch but is separate electrically.  I assume you’ll keep it as is.
>>>
>>> Sent from the all new AOL app for iOS
>>>
>>>
>>> On Wednesday, November 30, 2022, 9:03 PM, A Lawrence Fibich <lfibich at sbcglobal.net> wrote:
>>>
>>> Might be a bit hard to explain - so if you have/know this unit perhaps can talk off line?  I am rewiring the ON/OFF switch so the 220VAC doesn't go through the switch. Using an AC relay (output/control side) - to Switch/connect the power lines previously mounted to the ON/OFF switch. Then the ON/OFF switch is now used to 'turn on' the relay - power to the relay - comes from the Filament circuit via the ON/OFF switch to one side of the input/control on the AC relay - and the other terminal on the input of the AC relay is then grounded.Something just doesn't 'feel right' in having the one side 'grounded' - and asking/wondering if a problem. Another thought is ? if I should use a resistor of some value to decrease the voltage in this circuit going to the chassis ground? Thoughts and experience doing this on this unit is appreciated.73Larry F.W6EFLFibich at sbcglobal.net
>>>
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