Search found 260 matches

by rowuk
Wed Jun 05, 2019 9:27 pm
Forum: Everyones Projects
Topic: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
Replies: 1068
Views: 93228

Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

At least the car batteries would not hum!
by rowuk
Wed May 01, 2019 6:32 pm
Forum: Valves
Topic: OH YES
Replies: 14
Views: 881

Re: OH YES

Maybe the problem is not the price, rather the units ability to fulfill expectations. Because we do not even have words to describe what a "superior" playback should have, pricey things like this are an easy target. Sometimes we pay more for the idea than the technology to build it. I think most mem...
by rowuk
Fri Apr 19, 2019 8:40 pm
Forum: Speakers
Topic: Ferrite Versus Alnico
Replies: 5
Views: 356

Re: Ferrite Versus Alnico

Building a driver for 30 Watts allows for a much different voice coil and cone material/geometry. Maybe the increased tone comes from from not having to handle 1000watts?
by rowuk
Sun Mar 17, 2019 9:41 am
Forum: Headphones
Topic: House sound?
Replies: 8
Views: 2538

Re: House sound?

I compared all of these and ended up with the AKGs. My sound engineer son ended up with Beyer, an audiophile friend ended up with Grado. The explanation is easy. The problem is that the geometry of our head and ears is unique and that means that the cans are not all pointing in the same direction. D...
by rowuk
Sun Mar 17, 2019 9:30 am
Forum: Computer Audio
Topic: Digital.
Replies: 23
Views: 2789

Re: Digital.

2011 MacMini, BitPerfect, Focusrite Forte ADC/DAC, separate “analog” USB Powersupply. It could just be me, but Focusrite seems to have a magic hand on ADC/DAC transformation. For onsite recording I started with their Saffire range and now have tried many different models. Nothing ever appears that m...
by rowuk
Sun Mar 10, 2019 11:40 am
Forum: Speakers
Topic: 3D Print
Replies: 4
Views: 363

Re: 3D Print

I am using a Faital HF146. The horn is similar to the Fane but not baffle mounted. Everything is acoustically time aligned with low order crossovers.
by rowuk
Mon Mar 04, 2019 5:44 pm
Forum: Speakers
Topic: 3D Print
Replies: 4
Views: 363

Re: 3D Print

Actually my concept has not changed for over 30 years: don't change anything unless you can describe what is wrong and why a change would fix it. I have tried for several years to integrate the magnetostat tweeters and have given up. They remain conspicuous. So I have a defined issue and the opportu...
by rowuk
Sun Mar 03, 2019 5:13 pm
Forum: Speakers
Topic: 3D Print
Replies: 4
Views: 363

3D Print

I bought a 3d printer as a Christmas gift to myself and have been busy making trumpet and cornett mouthpieces. Now my playback has its turn. I have printed a couple of 3Khz horns for my compression drivers. I will crossover somewhere above 5K. The left is tractrix and the right is spherical. They ar...
by rowuk
Sun Mar 03, 2019 4:37 pm
Forum: Speakers
Topic: Speaker Motors
Replies: 29
Views: 1334

Re: Speaker Motors

It would be interesting to see/hear if the LCR equivalent of that speaker would provide similar results (without compression effects due to the voice coil getting hot).
by rowuk
Sun Mar 03, 2019 4:16 pm
Forum: Speakers
Topic: A Question of Right and Wrong.
Replies: 95
Views: 12009

Re: A Question of Right and Wrong.

I think that there are some absolutes. With them, perhaps some caveats, but still general acceptance. For sure, we can learn something from them all. 1) Quad ESL57 - perhaps bass and extreme upper register shy, but I have never met anyone that denies that they make a very special music 2) Klipschorn...
by rowuk
Sat Mar 02, 2019 11:32 am
Forum: Speakers
Topic: New 18" speakers.
Replies: 17
Views: 863

Re: New 18" speakers.

They are called Ripole - similar to the Linkwitz dipole, but with higher compression. Axel Ridtahler pioneered this variant. There are several documented builds from Germany.
https://www.lautsprechershop.de/index_h ... ler_en.htm
by rowuk
Sat Mar 02, 2019 11:23 am
Forum: Speakers
Topic: Speaker Motors
Replies: 29
Views: 1334

Bob Carver Challenge

Back in the day, Bob Carver challenged the audiophile press, claiming that he could replicate the transfer function of a tube amp with his SS power amps. https://www.stereophile.com/content/carver-challenge Bob Carver won. One of the major factors was adding a resistor to the output to dramatically ...
by rowuk
Fri Sep 14, 2018 9:05 pm
Forum: Everyones Projects
Topic: PCL86 SE Ultralinear Monos
Replies: 47
Views: 4287

Re: PCL86 SE Ultralinear Monos

Did this project ever get off of the ground? I am looking for a dedicated single ended pentode tweeter amplifier with only a watt or two.
by rowuk
Fri Sep 14, 2018 9:01 pm
Forum: Valves
Topic: The Humble EL34
Replies: 33
Views: 6290

Re: The Humble EL34

My low frequency single ended pentode is doing a GREAT job. I do not use tube rectification in the PS however. I really like what the RH amplifiers do with the best diodes. The cheapest magic that I know of is the RH84 and that just much bigger is the RH Universal with EL34 (which I like much better...
by rowuk
Fri Sep 14, 2018 8:53 pm
Forum: Speakers
Topic: Speakers Feedback
Replies: 1
Views: 479

Re: Speakers Feedback

David Hafler had an excellent set up for using 2 speakers to generate a surround channel out of normal stereo. The positive lead went to positive on the amplifier, the negative leads from both speakers were connected together. This created a L-R and a R-L difference channel. In case the surround spe...