[Elecraft] KPA500 Transformer

[David Christ]

Torque wrenches are used for two reasons:

1) to make sure things are tight enough

2) to make sure things are not tightened too much.

Stating the proper torque is good engineering practice.  For common screws and bolts one can find the suggested torque in reference books and online.  For special circumstances the manufacturer should publish the proper values.

David K0LUM

> On Oct 20, 2020, at 5:31 AM, Alan - G4GNX <g4gnx at g4gnx.com> wrote:
> 
> Then perhaps someone needs to educate Elecraft not to specify use of a torque wrench, in their assembly instructions. ;-)
> 
> 73,
> 
> Alan. G4GNX
> 
> 
> ------ Original Message ------
> From: "Bert" <ve3nr at bell.net>
> To: elecraft at mailman.qth.net
> Sent: 20/10/2020 05:15:21
> Subject: Re: [Elecraft] KPA500 Transformer
> 
>> Toroidal transformers cause very little acoustic hum, unless the core
>> is not tightly wound or the copper wire windings are loose!
>> 
>> If you have to tighten the mounting bolt with a torque wrench
>> to get the transformer quiet, something is wrong!
>> 
>> Bert VE3NR
>> 
> 
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