[Amps] HL2K question

[Patrick Egloff]

Hi All,

Thanks for the few suggestions.

You can find 2 pictures in a temp folder on my web page :
http://tk5ep.free.fr/temp/

The cabinet and cover are made in steel.

Thanks for any suggestion,
73 Patrick


2008/7/31 Patrick Egloff <pegloff at gmail.com>

> Hi all !
>
> A friend of mine gave me a Tokyo High Power HL2K amplifier (serial #
> 603456) . Of course, it did not work anymore.... :-)
>
> After reparing all the problems (HV transformer leaking, HV caps, fan + fan
> relay, different output Pi caps, bias circuit) , cleaning all the switch
> contacts and changing the tubes, it is now running normaly and is very
> stable. Well, i should say, more or less normaly !
>
> Indeed, i noticed something weird around the output coil. At first, i was
> testing the amplifier with the bottom cover removed so i could access to the
> caps and coils.
> When i mounted this cover for a final check before puting this amp in
> service, i noticed an output power drop on all lower bands but more
> noticeable on 80 and 160m. On 80m it dropped from 1,1kW to 950W and on 160m
> from 1kW to 800W ! Tuning is very "blur" on 160m.
>
> I also noticed that the cabinet around the coil was getting really warm.
> When running at full power and sliding the cover to move it closer to the
> coil to its normal position, i see some small sparks between the cover and
> cabinet and feel some "tinglings" in the fingers.
>
> This ouput coil is less than 1cm (0.39 inch) on all its length from the
> cabinet and 1,5cm (0.59 inch) on all its length from the cover ! I think
> this is far to close...
>
> Has anyone a HL2K and experienced the same problem ? Maybe more recent
> serial numbers have a different layout ?
>
> Except moving the coil a bit further from the cabinet and cover (not easy
> in a commercial amp), i don't see how i can solve this problem.. Any idea ?
> What would be a "good" distance ??
>
> 73, Patrick
>
> --
> Patrick Egloff - TK5EP
> email : pegloff at gmail.com
> Web page : http://tk5ep.free.fr
>



-- 
Patrick Egloff - TK5EP
email : pegloff at gmail.com
Web page : http://tk5ep.free.fr