[Amps] Another SB200

[jeremy-ca]

The meter movement is 200ua and is identical to both meters in the SB-220. 
The HM-102 meter also has the same rating. There are at least 3 different 
meter manufacturers and swapping dial scale often require drilling new 
mounting holes and trimming the scale itself for clearance. Use the old one 
as a template.

Svetlanas are usually fine on HF, some have problems with them on 6M. I 
wouldnt change from the 572B; most Chinese versions are reliable and 
reasonably priced.

Carl
KM1H




----- Original Message ----- 
From: "Andre Goldschagg" <totiranger at gmail.com>
To: <Amps at contesting.com>
Sent: Wednesday, September 26, 2007 6:59 PM
Subject: [Amps] Another SB200


> Hi all,
>
> After the last day or 2 i am half reluctant to post the following here:)
>
> I have on the shelf a SB200 that was part of a deal - i think the PO 
> wanted
> to can it. Anyway i fired it up and all works but the meter and it has all
> of about 100W of output.
>
> 1. Looking at the meter i can see that it has been opened and worked on so
> without testing i am going to assume it is cased. Is there any other meter 
> i
> can replace it with or where can i find a replacement.
> 2. It has 2 Svetlana tubes and from what i hear that might not be the 
> wisest
> choice as far as replacements go. This might prompt me to retrofit using a
> GI7B. What is the input impedance of the 2 572B's?
> 3. Without replacing the existing transformer is there a way i can 
> piggyback
> another transformer to up the voltage a tad to give me about 2500 on key
> down? The GI7B should draw about 400mA.
>
> Looking forward to some replies.
>
> Andre
> ZS5UA
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