[Amps] MLA-2500 Power Supply Capacity

[Gary Smith]

My question is how do you intend to cool the 800A7's?
If my memory is correct, the air was driven through (over and around ) the 
cooling fins of the 8874's in the MLA-2500's.  The 800A7's need the air to 
be driven up past the base(s) and then through the calling vanes from 
underneath the chassis.
73,
Gary...wa6fgi


----- Original Message ----- 
From: <k6zz at mail.ccis.com>
To: <amps at contesting.com>
Sent: Wednesday, January 18, 2006 6:33 PM
Subject: [Amps] MLA-2500 Power Supply Capacity


> Hi Folks,
>
> I could use some advice on the MLA-2500 power supply.  I'm
> planning to put a pair of 3CX800A7's in a tubeless but
> otherwise very good condition MLA-2500.  It seems like a
> straightforward modification, but I am somewhat concerned
> about comments I have seen regarding the ability of the
> power supply to handle these tubes.  What is it about these
> particular tubes that would put an extra strain on the power
> supply?  If they aren't driven any harder than the original
> 8875's or a pair of 8874's, what difference would it make?
> I could use different tubes but I happen to have a good pair
> of 3CX800A7's so I'm inclined to move forward if the power
> supply can handle it.
>
> I have no desire to push the modified amplifier to power
> levels beyond its capacity, but I would like to comfortably
> run the amp at the legal limit if the power supply and tank
> circuit can handle it.
>
> Have you done this particular modification before?  Is the
> power supply up to the task?  If not, what can be done to
> improve its shortcomings?
>
> 73, Bob K6ZZ
>
>
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