[Amps] AL-80A HV Glitch

[George]

Hello Mark, I have an ALS1500, and had a similar problem. Found the 
screws holding the HV filter board had become loose during shipping.
This was not a problem until after several weeks of use. Once it 
surfaced it progressively got worse. Normally this wouldn't be a problem 
(unless
they completely disengaged, however Ameritron has elected to use the 
standoffs supporting the HV filter board as the ground return path for 
the HV.
This can be very dangerous as well as problematic, as in my case. Not to 
mention poor engineering practice.  After tightening the screws on both
side of the standoffs, I added ground wires (four) from the filter board 
to the chassis. This resolved the arcing issue and gave me more confidence
in the power supply connections.

73,
George, K4GVT
 


Mark McCloud wrote:
> Hi All,
>
> I have an AL-80A that has developed a sort of momentary shutdown. I have it connected to 115vac.
> I noticed a momentary "snap" after it was turned on for a while but wasn't sure it was coming from the amp.
> Later it developed the momentary loss of HV but came back immediately. In fact, the HV meter never dipped more
> that a few hundred volts while idling before coming back to about 2900 volts. I took it off line and popped the cover to look 
> for anything that looked or smelled bad. Nothing found so far.
>  
> As a precaution I ordered 8 new Mallory caps from Mouser thinking that they may be the cause. Any thoughts?
>  
> Mark
> K6YCV
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>