[Amps] Dentron DTR-2000L Tank Circuit

[Carl]

Go back to the original plate choke and try it

Carl
KM1H


----- Original Message ----- 
From: "Mike & Becca Krzystyniak" <k9mk at flash.net>
To: <Amps at contesting.com>
Sent: Monday, November 22, 2010 3:57 PM
Subject: [Amps] Dentron DTR-2000L Tank Circuit


> Howdy,
>
>   Recently I wanted to give a hardware facelift to my old Dentron
> DTR-2000L, mostly because it is pushing 20++ years in age.   I was not
> looking to do the perfect rebuild with proper protection circuits and 
> other
> but instead simply doing a component refresh and adding a little 
> robustness
> to the original component selection.
>
>   Beefing up the power supply diodes and capacitor updates were straight
> forward.  Then, for what ever reason, I decided to try a new plate choke 
> and
> also went about changing out the smaller door knob caps with some of the
> Russian door knob caps of the same value.  I'm not sure where things went
> wrong but the tank is all hosed up now.  160m tuning is barn door wide.
> 80/75 has little to no dip and the loading seems to be out in left field
> somewhere.  40m and 20m are not much better but at least they show 
> somewhat
> of an expected response when dorking around with the knobs.  I didn't even
> try 15m or 10M as those bands tend to cook stuff beyond repair if not 
> close
> to begin with.
>
>   So, instead of doing a complete rip (backing out all the upgraded
> components 100%), is there a simple way to see where things moved too?  I
> have heard you can use an antenna analyzer for verifying the putput Z for 
> a
> given load.  Is this as straight forward as it sounds?  Any advice on how 
> to
> hammer things back to expected values for this class of desktop amp?
>
> Thanks in advance.
>
> 73's  Mike K9MK
>
>
>
>
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