heyheyhey..
now I'm testing with the new coil still at 50Vdc ;-)
ops I was forgetting: without dissipator :-)) just with the mounting
alu block it runs at room temp, maybe it is worth later at full power!
The
picture of Andy is not in thema: is the consequence of qro ampli on
undersize external loading coil :-)
By the way when this ampli will finally run on the antenna I need to re-
size the variometer because it warms already with 250W..

Also the new tank coil with 2,5mm² wire after 1 hour has a bit of
fever.. but is not warm as the former.

Just a quick question Andy: speaking of the guard circuit, if I read
Iguard whithout mismatch is correct the assumption that the link has
too many turns?

Alan: I'm vintage.. and I'm sure I have a variac in the basement :-)
thanks for the hint ;-)

Thanks all for the psycological and praxi help !!
Marco

----Messaggio originale----
Da: [email protected]
Data: 4-giu-2017 17.49
A: <[email protected]>
Ogg: Re: R: Re: LF: Re: I: Fw: For today the FETs survived...

Something like this ...
http://www.g4jnt.com/QRO_LF_DoesThis.JPG
'jnt :-)


On 4 June 2017 at 16:25, Chris Wilson <[email protected]> wrote:

> Hello Alan,
>
>
> No, what he needs is a video camera, and the courage to post the
> result here for scrutiny, we need a bit of fun now and again ;)
>
> Good luck Marco, what's the worst that can happen.... :)
>
>