KPA500 shut off with a bang

[Nand Kishore]

Hi All,

KPA500,S/no:1778 was being operated on RTTY  at approx.320W.
Antenna is a steppir beam.

Heard a loud DHOOP sound and the amp.went off.

Fuses intact.Opened the top and left side panel,nothing
seen as far as I can make out.

What should I be looking for?

73 and HNY.
Nandu
VU2NKS
ex-vu7ag,vu4kv
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