[Amps] Command Technologies VHF 1200

[Louis Parascondola]

could be a bad tube,  Bob I fix these amps. Lou W1QJ



-----Original Message-----
From: David Robbins <k1ttt at verizon.net>
To: amps <amps at contesting.com>
Sent: Tue, May 14, 2013 1:32 pm
Subject: Re: [Amps] Command Technologies VHF 1200



assuming that is similar to their other amps, check the control board for 
probably a 1a fuse and make sure it is still ok... that is the cathode return 
fuse that blows in case of a tube arc or power supply fault.  if it is blown 
replace it and then carefully try turning it on and tuning up.  those fuses can 
blow if it isn't tuned properly making the plate current high for too long.  if 
it still trips then characterize the 'trip'... is it the main fuse, the control 
board fuse, or grid protection that is 'tripping'.

May 14, 2013 01:23:03 PM, rja12 at comcast.net wrote:

Hi all,
Found one of these at a tiny fest in upstate, NY.......real cheap, 
but it has a problem. The owner told me it trips whenever drive is applied. 
I'm thinking it could be something north of the amp.......tuner, coax, 
antenna.....something that can't handle QRO. I got to pull the cover and it 
passed the visual and sniff test.

Once I enlist my wifes help (I'm still recovering from abdominal 
reconstructive surgery and can't lift that much weight) to get it in the 
house, I'll try it with my 2KW Bird Dummy load and see what happens. Hope 
the 3CX800 isn't smoked.

Anyone have any experience with these amps?

Tnx & 73,
Bob
N2OAM

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