> I tried the 100 ohm resistor and it causes a current
> rush. The lamps look like they are going to blow for a
> brief second.
This radio has pretty much the same tube lineup as the S-38. It does away with one tube by using a selenium rectifier.
I have both radios, and the S-38B does the same thing, as it lacks the 'globar' resistor. If you can find them somewhere (mouser.com, etc), you need a
'Negative Temperature Coefficient Thermistor'...
> I wonder if putting a delay circuit in would help
> any? Sort of what is used in amplifiers.
Too complicated - I think you can fix it if you can find a close approximation to the thermistor.
This is a sort of global parts search. He searches digikey, mouser, newark, etc all at the same time for one part entry.
I entered 'globar' and found at least one NTC thermistor at Newark:http://www.newark.com/jsp/search/productdetail.jsp?SKU=38C4165&CMP=AFC-OP
Newark, I think, sells to anyone; just open an account. Mouser.com and Digikey.com are all great parts houses and tolerate small orders.
BTW - I think the S-120 a swell receiver. It's a general-coverage, consumer-grade model. It ain't ham-grade. But mine's a 'daily driver' here at my desk at work!