[TenTec] centurion

[MadScientist1948]

2N3055 is about as common as America cheese…

A better replacement is the 2N3771, which has more than double the power handling capacity.

Both are REALLY common so you should not need to resort to NTE replacements.

Gary

> On Mar 28, 2018, at 1:17 PM, Rodney <w3krq at dejazzd.com> wrote:
> 
> Thanks for the info. I got a net130 as a sub for the 2n3055 and ordered off internet the mpsw42
> 
> -----Original Message----- From: Floyd Sense
> Sent: Tuesday, March 27, 2018 11:10 PM
> To: tentec at contesting.com
> Subject: Re: [TenTec] centurion
> 
> The problem is not on the QSK board, it's on the Filament/AC board.  Q1
> and/or Q2 are bad.  You'll need to pull the board out so you can get to
> Q1, which is on the back side of the board.  To do that, you need to
> heat the large filament lead till the solder flows and then pull up on
> that corner of the board to separate it from the filament lead.  Before
> doing that, there are a couple of screws to remove that hold the board
> in place.  You don't need to remove any of the other leads attached to
> the board - you'll be able to turn it over easily.  This problem can
> occur when a tube shorts, or if you fail to allow time for the filter
> caps to drain their charge before removing the cabinet top.  If the
> cabinet interlock closes and draws an arc, you'll probably lose Q1
> and/or Q2.  When you disassemble the aluminum piece on he rear of the
> board from the board, don't lose the two spacer washers or the two
> ceramic washers.  The metal washers are necessary to properly space he
> board so it isn't bent when you reassemble and tighten the two screws
> that engage the metal lugs.  Use a 2N3055 for Q1 no matter what's there
> now.  Q2 is obsolete, but you can find them on eBay.  They may not have
> the same case type as the original - don't be concerned about that.
> 
> You can email me if you have any further questions about the fix.
> 
> 
> 73, Floyd - K8AC
> 
> 
> On 3/27/2018 10:09 PM, Rodney wrote:
>> I have  plate current of 190m in stand by should be 0 , trouble is on the QSK board no.81542 I think it is Q1 and D2 anyone have any info on this problem. 73 Rod
>> 
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