Random said number 5
Wednesday, December 23, 2020
Wednesday, December 9, 2020
I've used this title before around the holidays and this time I'll take it 100% literal.
Being a huge fan of silver wound things and loving the sound of silver wound cartridges I decided to take my game up a notch and see what 0.9999 gold coils sound like.
Thursday, December 3, 2020
Thursday, November 26, 2020
Not many thinks kicking around lately that need new homes but these might appeal to a few of you.
A customer needed some naked speakerformers that went form -3 to -7dB and I inadvertently calculated and wound a pair that were -3.5 to -7.5dB. Rather than bin them for the copper I figure someone here can put them to good use. Full details of the concept can be found here.
leave a comment with a way to identify you and random.org will pick the new owner mid next week and of course I'll cover shipping.
Friday, November 6, 2020
I have been playing a fair bit with cartridge designs lately and have come to the realization that setup (mainly SRA) can have a profound impact on the sound of a cartridge. When trying to make apples to apples comparisons of different suspension types or silver vs. copper wound coils, small changes in SRA will quickly swamp out the variable you are trying to isolate.
Friday, September 18, 2020
It would seem that something as trivial as a garage door opener would never find its way to these pages but often it is the trivial that gives a glimpse into who a person really was.
This seemingly Rube Goldberg approach to automatically opening a garage door is a testament to the cleverness that was Dennis R. Hoyer. I have no idea when this was constructed but given that they date back to 1926 my guess is going to Sears was not an acceptable option for Dennis.
The key to the operation is the drive mechanism and when I first looked at it I simply thought motor pulled the door open and the casters and gravity did the trick to lower the door with the motor providing some resistive force. Upon further inspection I realized something different was going on since the casters were pointed in the wrong direction.
Saturday, August 15, 2020
Saturday, July 11, 2020
For s sense of scale here it is in relation to a charge coil for the magnet in a Sequerra ribbon.
This is a piece of more contemporary audio history. JC built the charger for Dick Sequerra to charge the magnets for his ribbon drivers.
Wednesday, June 17, 2020
Tuesday, June 9, 2020
Audio lost another of its treasures last week when Dennis R. Hoyer passed away in Milwaukee. If you had a vintage transformer that needed help, Doc was the person to call. On a recent trip to Milwaukee where I grew up I had the chance to visit his lab as 60+ years of his work was being dismantled. As I was admiring his winder his cousin Damian put his license plate from 1980 in my hand and suddenly I got all choked up and truly knew who Dennis was.
His files are a Who's Who of tube audio history
Thursday, May 28, 2020
Moving Coil Step-Up Transformer Design Considerations.
as a teaser here is the venerable peerless 4722 compared to a SUT that follows the practices I have laid out. Please leave comments with any critiques.
Friday, May 22, 2020
Next is something that fits in the middle ground between the Elmaformer and the basic autoformer modules. Many customers have been asking for an alternative to the plastic shaft found on the entry level units without the cost of the Elma switched version. These are based on a 23 position Blore Edwards switch and offer a good compromise between cost and performance.
It should be noted that all of the autoformers are wound identically to each other and the only difference between the various versions are in switch type.
Sunday, May 17, 2020
The chassis work by Melissa & Doug represents the 'Early Davey Functionalist' era that predates the 'Drug thru the Hudson' look of the early 21st century.
It is a simple remote controlled 100K linear pot attached to some RCA plugs used explore loading options for MC cartridges. At one point the concept piqued the interest of a well known Stereophile reviewer but upon borrowing the unit, he was terrified to plug it in to his system so into the archives it went.
The remote controlled pot was the handy work of of our good friend John Chapman and the concept evolved into the Opti-Load which replaces the pot with a relay controlled resistor matrix.
Tuesday, April 28, 2020
Sunday, April 19, 2020
Thursday, April 9, 2020
this is where it gets crazy, I just sent a 90 pound shipment to Ngan and the cost was $230 using fedex great rates. This was nearly double the $130 I was quoted for my initial guess of 120 pounds so I started asking questions. Turns out there is currently a price break at 110 pounds so adding 20 pounds of "weight" dropped the shipment cost to $118. I asked if I could just claim 110 pounds and ship 90 and they replied my rate would be declined and I would be charged full price at 90 pounds which is like $1800. This meany I needed to start throwing weight into the box and a pair of the 1dB speakerformers was part of that weight. I figured some would say the fix was in since the units are already in Hong Kong so I hit up random again and Jason gets to see if they go to 11.
Thursday, April 2, 2020
Ok... poor play on words. I just updated the Speakerformer page with some more fake news on why you need them. I also added a "Rshunt" calculator and two new tapers. One is a middling version that does -6 to -15.5dB and an "I don't know what I need" version that does from -1 to -20dB in 1dB steps.
Up for grabs is a pair of the 1dB per step versions pictured above just wash your hands for 20 seconds and leave a comment with your name or some sort of identification and random.org will pic a winner in a week.
- ▼ 2020 (22)
- ► 2019 (19)
- ► 2018 (14)
- ► 2017 (20)
- ► 2016 (13)
- ► 2015 (20)
- ► 2014 (33)
- ► 2013 (79)
- ► 2012 (88)
- ► 2011 (119)