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Messages - TC Chris

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1
Wow, what an opportunity.  And another photo shows two Karlson speaker enclosures. Who nows what drivers are hiding in there?  Here's a link to a discussion of the speakers:
http://diyaudioprojects.com/Forum/viewtopic.php?f=11&t=2851

Chris Campbell

2
Chat / Re: Are these speakers?
« on: August 15, 2017, 09:49:50 PM »
I'll go check it out Saturday . That area is usually expensive as far as estate sales go. I heard  a rumor a year ago that a
pile ( 7 to  8 ) of Big McIntosh tube amps  sold  for $70 at a yard sale in that area.

Long ago my Dad knew the projectionist at the biggest local movie theater.  One night we visited the projection booth.  It was large, and off on the left side was this big rack of perhaps 8 big RCA commercial amplifiers.  I've always wondered what happened to them.  Maybe they are still there--the theater has been converted to a performance space and "event center."  I have occasional thoughts of wangling a visit and if they are there, offering to cart the obsolete equipment away for them.

Chris Campbell

3
Magnificent Magnavox / Re: 1962 Magnavox Astrosonic Stereo Theatre
« on: August 14, 2017, 07:26:33 PM »
Some more:

Last photo here--TWO connectors not connected.

Chris Campbell

4
Magnificent Magnavox / Re: 1962 Magnavox Astrosonic Stereo Theatre
« on: August 14, 2017, 07:24:53 PM »
Here's the pictures of the inside. Let me know if there is anything visibly wrong that would cause the right channel not to have sound or if you have trouble viewing.

The 5th photo down shows a press-on connector--the kind often used for speakers--that is not pressed on to anything.  Maybe a speaker lead is disconnected?  Can't tell from the photo.

Chris Campbell

5
Chat / Re: Are these speakers?
« on: August 14, 2017, 07:21:48 PM »
Others may be more knowledgeable than I, but the only vintage makers of full-range electrostatics were Quad (British) and KLH (American).  There's also Janszen, but I think they didn't make full-range speakers.  And there were some more recent small-scale high-end makers.  See what name is on those devices.

There was also a "Sweet Sixteen" DIY speaker design, published in Popular Electronics or Pop. Mechanics.  It used 16 small cheap speakers in series/parallel.  M uncle built one but I never heard it.  I've read that they sounded like 16 cheap speakers.

Chris Campbell

6
Chat / Re: Are these speakers?
« on: August 13, 2017, 11:20:57 PM »
Check for more info on them.  Very thin speakers may be electrostatics--big capacitors that make sound.  They require a power supply, so look for a cord.

Chris Campbell

7
Magnificent Magnavox / Re: 1962 Magnavox Astrosonic Stereo Theatre
« on: August 11, 2017, 05:10:42 PM »
The usual reply to "is it possible?" questions is "anything's possible."  It's really easy to get the backs off, and then you can see what's actually happening.  Sometimes a tube that has lost vacuum (cracks, etc.) may show some orange-ish color.  But really, guessing at what might be wrong doesn't really get you anywhere.  Open it up and have a look-see.

Chris Campbell

8
General Discussion / Re: Altec A7 Voice of the Theater
« on: August 10, 2017, 06:01:37 PM »
My question was what kind of doping material you use on old cloth surrounds.  I've read that it deteriorates or disappears and needs to be supplemented.  There have been lots of approaches.  I was wondering what you have used.

Chris Campbell

9
General Discussion / Re: Altec A7 Voice of the Theater
« on: August 09, 2017, 10:21:53 PM »
My KLH 17s, currently semi-retired, are waiting for future service.  They're acoustic suspension and cloth-surrounded.  I've read that the doping material evaporates or disintegrates, and there appear to be much discussion about what to use as a replacement.  Have you done that?  With what?  The goal is obviously something that works but without changing the speaker's characteristics like resonance.

Chris Campbell

10
General Discussion / Re: Altec A7 Voice of the Theater
« on: August 08, 2017, 11:16:37 PM »
Nice.  What are the surrounds on the woofers--paper?  Foam surrounds were one of the great frauds perpetrated on the buying public.  Paper-surround speakers from 80+ years ago still work fine.  Cloth surrounds on my KLH Model 17s work fine after 50 years.  But foam....   My ca. 1983 Genesis speakers lost their surrounds all at once just after I had hand surgery, so I paid for surround replacement--but with butyl rubber.

Chris Campbell

11
Music / Re: First LP
« on: August 08, 2017, 09:02:14 PM »
Wow, I like it.  It's a little closer to the jazz end of the spectrum than the pop/dance music end.  I wasn't aware of that work.  I'm a sucker for music from the '30s.

Chris Campbell

12
Magnificent Magnavox / Re: Grounding/Fuse-Link??
« on: August 06, 2017, 11:35:04 PM »
Let's not get snarky.  There are few sure-fire solutions for lightning, if it chooses you.  In the old days TV antenna twinlead was protected by a "lightning arrestor" where it entered the house, but I suspect that those were mostly to prevent the house from burning down, not to actually assure protection of the TV.  Of course, tubes are more durable in EMF spikes than solid-state devices. 

My sailboat's VHF-FM radio has a "lightning arrestor" device in the coax. It's a spark-gap device and again, mostly to protect the boat.  I've also got a fancier version, some sort of gas discharge device, that I've never installed.  There is little unanimity on protecting boats from lightning.  I've grounded all the standing rigging--the wires that hold up the mast--as well as the 1.5" x 1/8" bronze strip that runs down the backside of the wooden mast to cover wire chases.  They are all connected with the external cast iron ballast by heavy gauge stranded copper wire.  There's a sharp-pointed stainless rod at the top of the mast.  One theory is that this creates a "cone of protection" for those under it.  Another is that it will lead the charge to ground if you are hit.  I'm skeptical of that, based on what I've read about the very weird behavior of lightning when boats have been hit.

You can always buy a surge protector, a good one, that will at least guard against line surges including ones that might come from lightning strikes that aren't direct on your house. For direct strikes, that original advice is sound:  unplug AC cord, disconnect external antenna.

Chris Campbell

13
Chat / Re: Hank Snow's '53 Eldorado
« on: August 06, 2017, 11:16:00 PM »
No radio means no antenna but yes, the antennae were vacuum through 1955.

Whoa...  Hank Snow's car had no radio?

Chris Campbell

14
Magnificent Magnavox / Re: proper idler wheel ?
« on: August 03, 2017, 05:40:04 PM »
If the old one is working, maybe the best plan is to save your money for other repairs.  If the rubber surface is lightly glazed, you can clean it up easily by using a belt or disc sander.  Find a suitable axle for the idler (nail, steel rod, etc.) and use it to hold the wheel's surface against the moving sandpaper.  If you skew it slightly, you can scuff off the surface.  Just don't get carried away and grind it up.

Chris Campbell

15
Chat / Gratitude for civility
« on: August 01, 2017, 09:15:27 PM »
Hey, just a note to say that visiting this group is always fun.  In part, it's just because I like old  electronics, and especially the kind that makes music.

But the other good thing is that we're all polite and tolerant.  I'm pretty sure that if we polled all participants, we would find a wide range of political opinions, religious beliefs, and Very Firm Views.  But nobody here gets into those things that make for big fights, and better still, nobody insists that his or her own views on electronics, engineering, or repair technique are the only correct ones.  There are some groups where the people with Very Firm Views regularly denounce all who disagree as fools or idiots.  It doesn't make for an interesting exchange of information.

Bear in mind that I agree with George Carlin, who said that everybody who drives slower than he does is a moron, and everybody who drives faster is an idiot.  But I have learned to keep my views of driving technique to myself, mostly.

Chris Campbell

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