Tube vs. Solid State Preamp
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From: JosephKK on 5 Apr 2010 21:28 On Sun, 4 Apr 2010 03:02:20 -0500, "Tim Williams" <tmoranwms(a)charter.net> wrote: ><krw(a)att.bizzzzzzzzzzzz> wrote in message >news:af6fr5t6iteeoe96r189559vusg7vmco6i(a)4ax.com... >> FM wouldn't be as obvious. Wouldn't FM just put a DC bias on the mic >> circuit? > >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 Cool, bragging rights accrue.
From: JosephKK on 5 Apr 2010 21:30 On Mon, 05 Apr 2010 01:17:12 -0400, "Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote: > >Don Lancaster wrote: >> >> Michael A. Terrell wrote: >> > >> >>> I've seen quite a few tube PA amps that picked up CB radio, and >> >>> police radios into the UHF Mobile band. Some small churches freaked out >> >>> when a police call came through the speakers, at full volume during a >> >>> church service. >> >> The original tale was that it was a ham radio operator, and the message >> said "Seek You the Exit!". > > > I've heard police calls, Am & FM radio stations, ham & CB radio on >sound systems over the decades. On CBer was interfering with a small >church next to his house. Instead of asking him to cooperate and stay >off the air during their services, they were banging on his doors and >screaming at him. 'Bigmouth George' got mad and every time they held >service for the next several months, he told them off. BTW, 'Bigmouth >George' lived a half block from me at that time. and all you needed to >hear him was a small speaker, a 1N34 and a few feet of wire for an >antenna. I would have "dropped a dime" on someone like that.
From: Jim Thompson on 5 Apr 2010 22:12 On Mon, 05 Apr 2010 21:21:20 -0400, "Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote: > >Jim Thompson wrote: >> >> On Mon, 05 Apr 2010 16:53:30 -0700, Joerg <invalid(a)invalid.invalid> >> wrote: >> >> [snip] >> > >> >I once repaired a TV set that had motorized tuning. Amazing. >> > >> [snip] >> >> Not really amazing... I've seen quite a few ;-) >> >> What might really amaze you... the 1968 Philco-Ford car radio... the >> search-tuning version... was all motor-driven inductor slugs... I >> know, I worked on the design :-) > > > Yet the Lincoln used a Delco 'Wobnderbar' radio that year. Cars manufacture back in those days was an interesting game. High end cars had all the experiments... the idea being: rich folk will tolerate field failures if you kiss up to 'em and give 'em a loaner... no maintenance costs whatever :-) (Interesting aside... you should have seen the brouhaha when wife-of-upper-Ford-management goes into a car wash in Dearborn, "rolling door locks" went off during the roll, the hand washers couldn't open the doors and the car behind crashed into m'lady's fancy Lincoln "toy" :-) Everything innovative I ever did in automotive went into Lincoln's, Cadillac's and Chrysler 300D's first. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | The only thing bipartisan in this country is hypocrisy
From: JosephKK on 6 Apr 2010 00:04 On Mon, 05 Apr 2010 17:21:45 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote: >On Mon, 05 Apr 2010 16:53:30 -0700, Joerg <invalid(a)invalid.invalid> >wrote: > >[snip] >> >>I once repaired a TV set that had motorized tuning. Amazing. >> >[snip] > >Not really amazing... I've seen quite a few ;-) > >What might really amaze you... the 1968 Philco-Ford car radio... the >search-tuning version... was all motor-driven inductor slugs... I >know, I worked on the design :-) > > ...Jim Thompson A motorized autodyne? Damn, that thing must have been a real pig to align.
From: Michael A. Terrell on 6 Apr 2010 05:29
Jim Thompson wrote: > > On Mon, 05 Apr 2010 21:21:20 -0400, "Michael A. Terrell" > <mike.terrell(a)earthlink.net> wrote: > > > > >Jim Thompson wrote: > >> > >> On Mon, 05 Apr 2010 16:53:30 -0700, Joerg <invalid(a)invalid.invalid> > >> wrote: > >> > >> [snip] > >> > > >> >I once repaired a TV set that had motorized tuning. Amazing. > >> > > >> [snip] > >> > >> Not really amazing... I've seen quite a few ;-) > >> > >> What might really amaze you... the 1968 Philco-Ford car radio... the > >> search-tuning version... was all motor-driven inductor slugs... I > >> know, I worked on the design :-) > > > > > > Yet the Lincoln used a Delco 'Wobnderbar' radio that year. > > Cars manufacture back in those days was an interesting game. High end > cars had all the experiments... the idea being: rich folk will > tolerate field failures if you kiss up to 'em and give 'em a loaner... > no maintenance costs whatever :-) > > (Interesting aside... you should have seen the brouhaha when > wife-of-upper-Ford-management goes into a car wash in Dearborn, > "rolling door locks" went off during the roll, the hand washers > couldn't open the doors and the car behind crashed into m'lady's fancy > Lincoln "toy" :-) > > Everything innovative I ever did in automotive went into Lincoln's, > Cadillac's and Chrysler 300D's first. Did you ever see Caddilac's 'Automatic Headlight Dimmer'? ;-) -- Lead free solder is Belgium's version of 'Hold my beer and watch this!' |