Doug,
If memory serves me correctly the original 2500 ran around 2200 vdc on the
plate and the 2500B around 1850vdc. Not sure what they changed or why since
it was the same tube config. the whole time. Maybe a different plate xmfr
manufacturer came around.
There was a very well written article in Comm. Quarterly around a year or
two ago. Also a nice article in QST around same time. Both dealt with the
conversion of the amp.
One guy used a pair of 3CX400s and the other a pair of 4CX400s.
>From what I have seen the pair of tetrodes cost abt the same as one of the
triodes.
If you want a very rugged little desk top and the same exact size (even same
cabinet) go with the Dentron Cliperton-L. Not enough L for 160 and the
doorknobs they use as padders are marginal but with the right mods it would
probably be better in the long run. Four of those 572Bs will draw around 1
amp at abt 2100vdc under load. I know from experience as I have had at least
10 in the shack over the past ten years. Four of the Svetlana 572Bs can be
had for around $240. Not bad for an amp that will do around 1400 out with
the stock power supply.
I usually incorporate most of Rich's mods and his web page is THE source for
the right mods.
GL with the hunt!!
BTW you could also talk with Murray Neece k5mDm as he does or did recently
have an MLA-2500 with a single 3CX800 tube. His e-mail is radioranch@qth.com
73s
Lane
Ku7i
-----Original Message-----
From: dsnowden@ncdc.noaa.gov <dsnowden@ncdc.noaa.gov>
To: amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
Date: Wednesday, September 15, 1999 7:01 AM
Subject: [AMPS] Dentron MLA2500 Question/s
>
>
>
>I am thinking about buying a MLA2500 without tubes.
>
>1. What is the difference between an MLA2500 and MLA2500B ?
>
>2. I know the tubes (8875 ?) are expensive now days and do remember
>that some sort of conversion to different tubes has been published
>somewhere.
>Is it worth the time and cost of conversion? I am guessing the tubes used
>for the conversion are not going to be cheap.
>
>Any references to conversion articles?
>Any of the famous Measures fixes apply to this amp?
>
>I'd kind of like to put one on my desk because I am sort of limited on
>space.
>
>Thanks, Doug N4IJ
>
>
>
> National Climatic Data Center
>
>
>
>
>
>
>
>--
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>
>
--
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