[Amps] Command HF 1250

Hugh Phillips K7XM jacshitt at mho.com
Sun Jan 20 17:26:04 EST 2013

I have a Command HF 1250.

I'm trying to locate D21.

(1) When Keying the amp I see high Grid Current.
(2) F2, 1 amp fuse on control board OPENS.
(3) I see slight NEGATIVE plate current.
(4) I think D21 is shorted.
(5) Where is D21 located???
This isn't the easiest amp I've worked on.
I can't understand why they didn't high more components inside more enclosures.

Thanks In Advance.

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