Tube vs. Solid State Preamp

Probably not the tube doing the rectification, though. Usually a corroded wire/contact in a mic was the culprit.

Well, in Europe propaganda stations from behind the former iron curtain were huge in terms of power. Megawatts. In Germany the problem was Radio Tirana. It was sad, they were blowing money on propaganda and electricity while their people were barely scraping by and often didn't have enough electricity. But that's what such political "systems" ultimately do to people.

--
Regards, Joerg

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"TIMM"s, i think.

Depending on the sermon topic and the nature of that police call it could be a fitting reminder of the consequences of sin :-)

But FM rarely gets in. AM radio from low flying aircraft is another matter. Ham radio as well but since they use SSB most of the time that will sound more like Charlie Brown's teacher ... wah-wa-waah ... ouuah-wah-wah-waaah.

--
Regards, Joerg

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No, it was usually on an unused mic input, where someone forgot to screw the shorting cap back on. That was one of the reasons that Switchcraft developed the shorting version of their 2501 series chassis mount connector.

--
Lead free solder is Belgium's version of 'Hold my beer and watch this!'

You really need to move to a better neighbourhood. BTW a Finnish friend of my daughter's (the friend lives in Olu--they met at school in France) says that during the Winter War, the Finnish government essentially put the whole adult population on methamphetamine to increase production, and then cut off the supply cold turkey when the war was over.

Is that so?

Cheers

Phil Hobbs

--
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Principal
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http://electrooptical.net

For communion do you serve coffee and doughnuts? ;-)

FM wouldn't be as obvious. Wouldn't FM just put a DC bias on the mic circuit?

The problems (with phones, too) I've found were lousy connections.

No, those are for _after_ worship services, even for deputy sheriffs in attendance :-)

Yes, that's why I don't quite understand how police radio could have gotten in there unless it was through a wireless mike link.

--
Regards, Joerg

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circuit?

How many wireless mikes did you see in small churches in the '50s trough the '70s?

Any AM detector can demodulate FM via 'Slope Detection'.

--
Lead free solder is Belgium's version of 'Hold my beer and watch this!'

Early tube audio amps were high impedance and unbalanced inputs, which made them easy to disturb. Kind of like Phil or dimbulb.

--
Lead free solder is Belgium's version of 'Hold my beer and watch this!'

Welcome to America :-( ...Jim Thompson

--
| James E.Thompson, CTO                            |    mens     |
| Analog Innovations, Inc.                         |     et      |
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circuit?

You hadn't said 70's but I did see wireless mikes back then. Here I must confess that I rarely went to church in those days. But we used them at school events, at the town hall, and so on. Once as a kid I was a helper during some council meeting ballot. They handed me a wireless mike to announce results. I felt real important when they gave me that thing :-)

... _if_ there is a rather steep filter in front of it. That would have to be a real coincidence.

--
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corroded

circuit?

The input is unbalanced, and not dressed for RF, so it will do slope detection. I used to put a ferrite bead and a 100 pf capacitor in old amps to make a low pass filter to keep all the RF from the usual triode input stage. A lot of the old amps ran the preamp at full gain, with the gain control after the triode. Some nasty designs, lifted right out of the RCA, GE and Sylvania tube handbooks. A 5W VHF or UHF commercial radio would knock some of them out of service at a quarter mile.

--
Lead free solder is Belgium's version of 'Hold my beer and watch this!'

If it was that long ago they were probably AM police radios.

Chris

I wasn't alive in the '30s.

--
Lead free solder is Belgium's version of 'Hold my beer and watch this!'

Pervitin was administrated to ski/foot patrols operating behind enemy lines

in the Winter and Continuation war, typically a week at a time. Pervitin was also administered to ordinary ground troops during the massive Russian assault in 1944.

I have never heard of any wide spread use of Pervitin by civilians.

A massive use of Pervitin would have created a large post war drug problem, however, immediately after the war, the most addicts were due to morphine, which was available without descriptions in the 1920-30's and the use in military hospitals during the wars.

BTW, the city is Oulu (not Olu) at 65N at the Bay of Bothnia.

At school, the school radio station gets into everything. Part of this is because the antenna is on top of the dorms, and who knows, maybe they don't have it tuned very well and it's putting out some AM as it is. But I've been told it's more likely due to multipath, e.g. by reflecting off the building across the street.

I installed ferrite beads and ceramic caps. My stereo is now quieter than anyone else's at the school.

Tim

--
Deep Friar: a very philosophical monk.
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