[Amps] Command HF-2500 meter lamps wattizit?

[Carl]

----- Original Message ----- 
From: "Bill, W6WRT" <dezrat1242 at yahoo.com>
To: <amps at contesting.com>
Sent: Wednesday, July 21, 2010 8:44 PM
Subject: Re: [Amps] Command HF-2500 meter lamps wattizit?


> ORIGINAL MESSAGE:
>
> On Wed, 21 Jul 2010 17:15:35 -0400, "Carl" <km1h at jeremy.mv.com> wrote:
>
>>
>>What a PITA to change the PS caps in this thing!
>>
>>Carl
>>KM1H
>
> REPLY:
>
> Amen!  When the HF-2500 was originally reviewed in QST the reviewer
> made a comment about how easy it would be to do repairs. The guy
> obviously has never actually tried to repair one.
>
> 73, Bill W6WRT


Whoever approved that layout should be castrated!
The QST review claims not only is it easily servicable but then says the PS 
board is in the pressurized tube compartment....to keep it cool.

Maybe thats why they used undersized equalizing resistors whose cool leads 
browned up the PC board rather nice. I wonder how much air flow there is in 
a dead end side section of that chassis? The blower is at the far end 
blowing across the opening and right at thet tubes. And to add to the insult 
the caps are Nichicons without even a temperature rating. No wonder the HV 
was down  400V and it wasnt just the three 1meg 2W carbons across almost 
2700V.

Now I know why the customer dropped it off and said "take your time".

Carl
KM1H




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