[Amps] HLA150

[Will Matney]

Joe,

What would one do about the cheap flimsy PC boards they use which do warp, and have traces undersized that burns out all the time? Also, one would need to take the heatsink out, and have the whole top machined flat again to cure the problem where the self-tapping screws puckered the aluminum up around the screw making it so the transistors cant set flat. Last, these are about all designed around low RF drive levels and have a weak voltage divider in the input made from 1 watt resistors and a potentiometer, plus a very weak antenna relay for the power going through it. That is on the ones I've seen, and I'm not too sure that you wouldn't have more in it than you could by another good one for. That's my opinion of them of course.

Best,

Will

*********** REPLY SEPARATOR  ***********

On 6/28/06 at 10:06 AM Joe Isabella wrote:

>I agree -- the question to me is whether or not the cost of the amp + new
>circuit + time to modify is worth the hassle.  If the amp only does
>100-150W cleanly, just go buy a 100W rig!!  Probably a lot less trouble in
>the end.
> 
>Joe, N3JI
>
>
>----- Original Message ----
>From: Steve Thompson <g8gsq at eltac.co.uk>
>To: amps at contesting.com
>Sent: Wednesday, June 28, 2006 10:00:19 AM
>Subject: Re: [Amps] HLA150
>
>
>Joe Isabella wrote:
>> Sounds to me like adding a regulated bias circuit (read: CHEAP) would
>solve its problems.
>
>Checking the limits of linear operation is an important test - likely to 
>be lots less than the 'rated' output even with improved bias supplies.
>
>Steve
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