Check the 1.5a fuse on the control board.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
> -----Original Message-----
> From: w3kl@w3kl.com [mailto:w3kl@w3kl.com]
> Sent: Saturday, December 05, 2009 21:19
> To: amps@contesting.com
> Subject: [Amps] Help With Command Technologies HF2500
>
> I have a Command Technologies HF2500 with QSK circuit.
>
> Earlier today when I fired it up on 160m, it behaved normally for a few
> minutes, but then I noticed that the grid current meter was pegging and
> the output (on CW) was zero. No plate current but plate voltage is fine.
>
> At first, I thought I might have blown the 3CX800A7s, but after removing
> the tubes and checking for shorts, I find none.
>
> I suspect that the biasing circuit has failed. Before I furthe tear down
> the system, does anyone have any insight into this probkem? Perhaps some
> of you have seen this problem with an HF2500 in the past and can steer me
> in the right direction.
>
> Thanks for reading - I appreciate any help anyone can provide.
>
> 73, Jeff
> W3KL
>
> Jeffrey K. Okamitsu, PhD, MBA
> +1-609-638-5402
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