Wednesday, March 31, 2010

The Microscopy of Vinyl Recordings

Ever since I scored the Garrard 301 I have become a vinyl junkie. Doing some reading at the vinyl engine I found this link to microoscopy of vinyl recordings.

I find this fascinating. All that beautiful music comes from these grooves.

The site also has some great detailed pics of stylus.

This is a great five page article.

Friday, March 26, 2010

Thursday, March 25, 2010

Jensen Loudspeaker Vintage Ads

Jensen Imperial ad as well as a kit and component price list. I'd love to hear an Imperial. I have seen one. They are a good size.

Tuesday, March 23, 2010

Les Electrodes Hand Made Vacuum Tubes

Some people roll their own tubes few make their own tubes. Claude Paillard is such a man. Bravo!

Part 1.

Part 2.

Sunday, March 21, 2010

Harry Olson Folded Horn 1956

This looks to be a great horn. It is featured in the book Acoustical Engineering by Olson. Hand written notes by Olson have been posted by Bill Woods of Acoustic Horn.The driver Olson used was the RCA MI-1141-A.Here are some excerpts from the book Acoustical Engineering.

Olson's hand written notes.

Wednesday, March 17, 2010

Cleaning records with wood glue. Insanely stupid or insanely genius?

Allegedly this works and very well. It has been posted on various forums across the internet but starting in Europe. Points have been raised about residual chemicals left on the record after removing the glue. I can't answer that but maybe someone can. Please post a reply to this thread if you know.

I think this method is interesting. If it works and is not harmful to stylus or cartridge this method could be used on extremely dirty vinyl. I'll likely try this just to say I did.

I am going to take a guess and say pouring wood glue over records is likely a bad idea. For those not wanting to try wood glue. Here is what the other side of the coin recommends.

NOSValves VRD tube amps or Valve Roller Dream amps

I've been lucky enough to hear these VRD monoblock tube amps on several occasions and they are incredible. They are also a bargain at $3199 a pair. These are American made hand crafted tube amps.

From the website.
VRD Mono Block Specs

Walnut, cherry and maple hand finished with 5 coats of Tung Oil

Brushed stainless steel Top/Bottom and Rear plates

Custom wood type requests can be accommodated

60 watts Ultra Linear/30 watts Triode switchable

KT88 output tubes, Standard
Full bias control per output tube with above-chassis test points and
multi-turn controls
1.1V input sensitivity
100K input impedance
AC balance control
1000V PS filtering for extended life
10H choke per amp
All Triode front end, 12AX7 Driver, 12AU7 phase splitter, Direct coupled
Tube Rectified 5AR4
Separate provisions for 4, 8, and 16 ohm speakers
Valve Rollers Dream! The amps can run EL34, 6L6GC, 5881, 350B, KT66, KT88, 6550, KT90 and more (some tube choices require a 5U4GB rectifier tube)

Phase splitter can be experimented with, using 12BH7 or st1:stockticker>ECC99

Input/Driver tube can use 12AX7 and variants
Total Harmonic Distortion .06% @ 1 watt, .15% @ 5 watt, 1% @ Full-rated power 20Hz to 20KHz

Dimensions 10 ¼” X 14” including speaker binding posts

Lettering is just for information not on the actual amps.

The most annoying thing to me in the hi-fi industry is plastic speaker binding post. They are crap. When you touch them they feel cheap but when you grab onto these metal binding post you just know you have a high quality piece of gear. I know that is nit picky but that is how I feel about it.

Craig also does incredible vintage tube amp restorations. I've heard a couple of his restored Scotts and they are top notch. You wouldn't know the amp was 50 years old. High quality craftsmanship.

One last pic. If you prefer a stereo VRD amp that can be arranged.

Tuesday, March 16, 2010

Early hi-fi enthusiasts

I like the term hi-fi enthusiasts much better than audiophile. The term audiophile to me conjures up people who spend thousands on megabuck interconnects speaker cables and power cords.

Check out this early hi-fi enthusiasts system. It seems part of this system is portable. Lots of 10 inch RTR tapes in the back ground. The tone arm is really interesting as well.

1938 DIY Beer Keg Radio

I'm curious how many of these were built. Not hi-fi but certainly worth building to confuse your dog.

Monday, March 15, 2010

Jensen Back Loading Folded Horn Cabinets July 1952

Great documentation for a Jensen back loading folded corner horn. You can use 12 or 15 inch drivers. This was shown earlier as a Brociner cabinets but it seems it was more than likely licensed from Jensen. The documentation calls for a Jensen P15 to be used which is what was used in the early Klipschorns.

Thursday, March 11, 2010

Audio Tube Gods Be Praised

Brent Jesse one of the most trusted names in tube sales has a youtube channel. I feel like a dunder head for only now finding this. After getting burned on tube sales a couple times I called Brent at he was not out to sell the most expensive tubes but to help me get the best tube for the appplication. He also excels at finding the best tube in a price range. He can of course guide you to the cream of the crop high dollar tubes if that is what you want. I never buy vintage tubes from anyone but Brent.

Brent Jessie Audio Tube Channel.

Direct to a coupls videos.

How to spot rare 12ax7 tubes.

How to spot a vintage 6SN7GT Part 2

How to spot a vintage 6SN7GT Part 3

Horn Type Speaker Systems By George L Augspurger

These are two great articles from Audio High Fidelity. They talk about some of the most important speakers in audio history.

Part I Fundamentals of horn speakers; the folded horn; introduction to the corner horn.

Part II Variations in the Klipsch design; the exponential labrinth; the radial horn.

Tuesday, March 9, 2010

Happy Birthday PWK The Legend In Sound

Paul W Klipsch would have been 106 today. Thanks for the reminder from Klipsch employee Trey Cannon. Thank you for the incredible speakers PWK.

You just know what is about to happen in this photo. That guy is about to get a Bull Shit button flash.

At the controls in the Hope labratory with the mighty Klipschorn.

This is Paul W Klipsch at a CES show unveiling his newborn Klipschorn Jubilee. Unfortunately Klipsch Corp scrapped the project after Paul's Passing. The Klipschorn Jubilee LF and K403 HF were a genius swan song from one of the great speaker builders.

Catenoid Corner Loudspeaker 1956 - 1960

This is an interesting speaker. I saw one once but had no idea what it was at the time or how much it might be worth. Wish I had bought it but oh well live and learn. There isn't alot of information available. Below are pictures articles and snippets I've found of the Catenoid.

The Audio League Report Vol.1 No.10 November 1955.