On Mon, 12 Oct 1998 12:42:39 EDT YDDOG@aol.com writes:
>
>ok gang ,,
>
> Here is the story ,, at a recent hamfest I purchased a
>Hunter
>2000 c
>* Bandit * . Aside from a shorted filament choke , open resistors ,
>blown
>capacitors in the power suppy and visable burns on the plate of the
>tuning Cap
>,
>it was in Good shape <sic> .
Not bad for a circa 1965 amp that could be viewed as the "prototype" to
the SB-220.
Since the Bandit was available as a kit it would be prudent to examine
closely ALL connections.
I have just about finished repairing it
>and want
>to
>fire it up , thus my question . Finding the right filter capacitors
>was
>difficult , the
>originals are 140 MF at 475v ( 6 total ).
Modern caps of the Computer Grade variety are rated at least 475V Surge,
some a bit higher.
I was only able to locate
>this type
>of
>cap at 450v and replaced them with these. The total voltage of these
>capacitors
>is now about the same as the plate voltage 2700v. I know from an
>engineering
>view this is terrible ,, but ,, will it work ? Is there anything else
>I should
>be checking before bringing it up ?
Altho the schematic says 2700V, the manual states 2200V which I would
assume is under load. I havent had one here for about a year and my
manual has no real world PS notes. The first thing to do is bring the amp
up with a variac and measure the voltage across each cap as you increase
the primary. That will tell you what will need to be done.
Since the amp uses a doubler supply additional caps would have to be
added in pairs. There is no room above but a pair of axial lead Mallory
TC-807 series might just fit below.
With no input network and a plate choke that is marginal on WARC the
2000C has been showing up at decent prices. It also makes a great
platform to convert to 6M!
It will run up to 1300W out with 100W of drive....my notes actually say a
high of 1350W on 40M and a low of 1150 on 10M with like new Amperex
8163/3-400Z's.
GL Carl KM1H
something I might have overlooked
>?
>I defer to the experts .
>
>Mike ( N I 3 I )
>
>--
>FAQ on WWW: http://www.contesting.com/ampfaq.html
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
>Search: http://www.contesting.com/km9p/search.htm
>
>
___________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com
or call Juno at (800) 654-JUNO [654-5866]
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|