[Amps] AL-811H popping fuses

[Alek Petkovic]

Yep. A very frustrating amp to work on. They desperately need a 
removable cover below the tube socket area. Getting to anything on that 
control board is a mission as well.

Not a nice machine to work on.

73, Alek. VK6APK

On 1/02/2014 1:40 AM, Tom Osborne wrote:
> Well - got it fixed.  It was the filter caps.  Also ran into another 
> problem (that I caused) when working on it.
>
> I was going to take the sub chassis with the tube sockets out to check 
> the bottom.  After loosening one of the screws, found it was the one 
> that held the tube socket in, not the one that held the chassis in. 
> After loosening it, I decided not to take the chassis out.
>
> Problem was - now I've got a loose screw holding the socket in as the 
> nut fell off.  No problem - right?
>
> Yes, there was a problem.  When I fired the amp up, I was getting a 
> bad motorboating sound in the radio.  Rechecked all the caps and they 
> were tight.  I took the tubes out and put them back in one at a time 
> to see if it made the noise.  Put 3 of them in and all was OK, but 
> when I got to the last one, the noise started again.  It was the one 
> with the loose screw on the socket.
>
> I had to remove the sub-chassis to get to the bottom of it and put the 
> nut back on and now all is OK.  Seems that was holding the ground for 
> the grid.  Doesn't work very good when it's loose :-)  73
> Tom W7WHY
>
>
>
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-- 
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