Try one tube at a time. Probably just one tube went.
On Sun, Mar 17, 2019, 9:29 AM gudguyham--- via Amps <amps@contesting.com>
wrote:
> Sounds like a bad tube
>
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> On Saturday, March 16, 2019, Bob Gibson via Amps <amps@contesting.com
> > wrote:
>
> I have a problem that just came up with my QRO amp..First I blew a 1/2a
> fuse on the bias board..I replaced it turned it back on then a 1/2a fuse
> blew on the LV and bias board again but not the same fuse..Screen voltage
> is OK and HV is OK. When I hit with 10 watts the fault light comes on and
> kicks the amp off and I see the grid current meter go all the way over..I
> see no burnt parts or smell parts...could this be a grid short in one of
> the tubes? I have pulled the tubes and nothing looks bad below..I think I
> will send the tubes down and have them check just to make sure it is not a
> problem with one of them..Bob W5RG
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