SB 200 question

[Ray Friess]

All those who replied:
Thank you for your input.  It is exactly the type of answer I was
looking for.   Right to the point.
I've been a ham for 35 years and know a fair amount of theory, but
sometimes something pops
up ... even for us old timers ... that help is needed on without a lot
of theory discussion.   Don't
get me wrong .. I love discussing theory as much as the rest of us, but
sometimes I want to get
right to the practical fix and you have all helped me out.

This is a new amp (new for me anyhow ... if a Heathkit can ever be
considered new anymore HI HI)
and I have not loaded it up yet.  I plan on putting a wattmeter on it
and if I get what appears to be
a correct output, that will also tell me that the plate voltage is where
it should be.

Scott ...   about the 30L-1.    I also have two of them ... and I get
about the same plate voltage you
do ... 1900 to 2000 and I use 120 input for them..    That was part of
the reason I was puzzled about
the sb 200...
    Thanks again all of you...   I'll check those resistors and let you
know what I find....
Ray

Freeberg, Scott (STP) wrote:

>Ray, I saw Gareys comments to your question and he described it well.  One additional thing to consider is that the resistor string feeding the meter could be drifting or out of spec.  My SB220 started reading low plate voltage.  Luckily it wasn't a power supply problem, but instead one of the several megohm resistors in the meter voltage divider was seriously out of tolerance, throwing the voltage divider off big time.  Doesn't take much error on a several megohm resistor to throw a voltage reading off big time.
>
>I don't own an SB200 but I believe its similar to the Collins 30L-1, and I get around 1900 volts on the plate, and I also use 220 VAC.  When wired properly, the transformer outputs the same high voltage voltage regardless of the 120 vac or 220 vac input voltage. Sounds like your SB200 is working great.
>
>The SB200 sure is a nice looking amp.  Hope to get one someday.
>73, Scott WA9WFA
>
>
>
>
>

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