Home » Audio » Thermionic Emissions » Trigger finger is itchy
Trigger finger is itchy [message #92119] Mon, 27 July 2020 12:53 Go to next message
Rusty is currently offline  Rusty
Messages: 391
Registered: May 2018
Location: Kansas City Missouri
Illuminati (1st Degree)
There's a new hombre on the horizon. And my trigger finger is really itching to pull. A preamp that has phono with gain controlled by a tube. And tube rectification. https://www.transcendentsound.com/slider.html
I had resisted pulling the trigger on his prior phono pre because it had so much gain that with my set up would necessitate adding volume pots for gain attenuation on each channel of it. Rozenblit is known for innovation and dependability with his products. I can attest to that. I've used his OTL and preamp for decades now. The preamp, the grounded grid I cobbled together from plans from one of his books. Which makes it a rather sentimental attachment for me. But I can use it with my old Hafler 220 amp and my 1st speaker build, Dynaudio Gemini's. This ought to be quite a change from the Graham Slee phono I've use for decades too. Fate made me wait with his former phono pre. Had to have a new hvac system put in. Guess the fickle finger worked. Ready, aim....

https://www.transcendentsound.com/images/slider/DSC_0041@2x.jpg
Re: Trigger finger is itchy [message #92120 is a reply to message #92119] Mon, 27 July 2020 13:14 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 17833
Registered: January 2001
Illuminati (33rd Degree)

That looks really sweet! If you do pull the trigger, please write back. Maybe even do a build thread!
Re: Trigger finger is itchy [message #92130 is a reply to message #92120] Tue, 28 July 2020 21:40 Go to previous messageGo to next message
gofar99 is currently offline  gofar99
Messages: 1533
Registered: May 2010
Location: Southern Arizona
Illuminati (4th Degree)
Hi, Yes some feed back would be nice. The write up makes me want to mention something about signal to noise. I notice that the preamp is listed as DBA for S/N. This is a common way to do it but..... it might not tell the whole story. DBA uses a roll off for noise below say 200 HZ and is really steep below 50HZ. I personally prefer DBV. That is flat without any roll off. At about 20HZ the difference is about 40 to 50 db. So at 20HZ a device with a -80DBA S/N could actually have only a S/N of -40 DBV. Since the DBA curve is supposed to be related to the sensitivity of our hearing that may not matter to most folks. I personally have the feeling that low frequency junk can alter the quality of the sound. I was really chagrin when I measured my pre-production tube phono preamps at -53DBV at 20HZ. The DBV for 300HZ and up was -93. A less scrupulous designer would say fine -53 DBV at 20 is about -90 DBA and let it go. Not my style. I thrashed it and made several changes so that at any frequency below 300HZ it was at -80DBV and still at -90 to -95 above that. Is it quiet....yes indeed. So my message is beware of specifications and know what they mean. I encourage folks to listen to devices and determine if they are suitable and pass on the numbers. Smile

Good Listening
Bruce
Re: Trigger finger is itchy [message #92131 is a reply to message #92130] Wed, 29 July 2020 12:51 Go to previous messageGo to next message
Rusty is currently offline  Rusty
Messages: 391
Registered: May 2018
Location: Kansas City Missouri
Illuminati (1st Degree)
Never noticed any spurious noise with the two older designs I've used for some time. From his website he has a line stage product called the fixer that the specifications list noise as less than 200 microvolts unweighted. Is that the same as what you mention? Anyway, based on the products I've used for so long and his strong reputation in the diy community for integrity I don't feel too insecure that this product will be anything less than the write up says. Guess I need to pull that trigger and find out. Final cost with tubes is going to be around $750. The one tube it's built around, the 6386 is a pricey little buggar. Around $125.
Re: Trigger finger is itchy [message #92132 is a reply to message #92131] Wed, 29 July 2020 13:33 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 17833
Registered: January 2001
Illuminati (33rd Degree)

I took the comments on S/N to be more about dBA versus dBV and less about the device.

I kinda have a feeling that preamps from both Bruce's are pretty stellar. Both are passionate men making the best stuff they can make.

Such good stuff!
Re: Trigger finger is itchy [message #92133 is a reply to message #92132] Wed, 29 July 2020 19:30 Go to previous messageGo to next message
Rusty is currently offline  Rusty
Messages: 391
Registered: May 2018
Location: Kansas City Missouri
Illuminati (1st Degree)
Absolutely. I've no doubt about the veracity of both designers. Both have my admiration as creative craftsmen, even artisans depending on how looking at the audio business. I just know Rozenblit from using his products and having a bit of home town pride of someone making a small mark in the audio field that lives a few miles away from myself. I don't detect animosity, just some professional throw down. I've read enough peer debate, here and many other venues and disciplines that it's all part of the make up of experience and interpretation. Healthy stuff.
Re: Trigger finger is itchy [message #92134 is a reply to message #92133] Wed, 29 July 2020 20:27 Go to previous messageGo to next message
gofar99 is currently offline  gofar99
Messages: 1533
Registered: May 2010
Location: Southern Arizona
Illuminati (4th Degree)
Hi, I never intentionally disparage other designers or builders. Doing so has IMO no value. I just wanted to point out that there are different ways to indicate performance and that the ultimate decision for getting something ought to be by listening to it. I figure if the person getting it is satisfied then all is well. Smile

Good Listening
Bruce
Re: Trigger finger is itchy [message #92152 is a reply to message #92119] Sat, 15 August 2020 11:13 Go to previous messageGo to next message
Rusty is currently offline  Rusty
Messages: 391
Registered: May 2018
Location: Kansas City Missouri
Illuminati (1st Degree)
I ordered it and I will post pics of it's innards after I get it soldered. And how I interpret it's contribution from what I used for so long. Have to wait for his delivery he said. He's swamped with orders. He's a one man band. I'll get personal delivery from the designer himself.
This forum seems to have the dog days of summer with a covid twist going on. Not much activity.
Re: Trigger finger is itchy [message #92156 is a reply to message #92152] Sat, 15 August 2020 15:10 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 17833
Registered: January 2001
Illuminati (33rd Degree)

That's awesome, Rusty! Can't wait to see pics!
Previous Topic: Microphonic KT120s
Goto Forum:
  


Current Time: Sat Aug 15 15:29:36 CDT 2020

Sponsoring Organizations

DIY Audio Projects
DIY Audio Projects
OddWatt Audio
OddWatt Audio
Pi Speakers
Pi Speakers
Prosound Shootout
Prosound Shootout
Smith & Larson Audio
Smith & Larson Audio
Tubes For Amps
TubesForAmps.com

Lone Star Audiofest