[AMPS] SB-220 parts needed

[rich]

>
>Hi Gang:
>I should get this thing going. But first, I need:
>
>Filament xfmr, p/n 54-238

When a tube grid/fil. shorts in a SB-220, the unfused 5v filament/relay 
110v PS transformer usually melts down.  To prevent this possibility with 
the new transformer, convert the cutoff bias method from voltage-cutoff 
to resistor-cutoff,  [see article on my Web site]

>Multimeter,    p/n 407-146
>(I think the plate current meter, p/n 407-145, has the same specs)
>
They are both 200uA movements.  The same movement was also used in other 
Heathkits.  

>...

good luck, Ralph

-  R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, 
www.vcnet.com/measures.  
end


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