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Old 6th September 2010, 05:58 PM   #4691
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So far no issue with feedback. I had my concerns as well, but is a temporary compromise. For serious listening I can pull the speakers away from the stand. The table weighs about 30kg so is itself very stable.
Right now I am glad to have the stuff off the floor and away from underfoot.
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Old 6th September 2010, 06:11 PM   #4692
Salas is offline Salas  Greece
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Nice. Good luck with the baby shunts then.
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Old 6th September 2010, 06:29 PM   #4693
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Hello
I have picked the lowest Idss pair of 2N5459s I could find, 6.6ma for Q7. I am thinking that R7 2.2K should be 1 watt maybe watt not watt? I^2*R=watts. The other resistors look ok at watt.
Thank you Salas for tossing out the RIAA and B1 projects, they are food for thought. JFETs are new for me to chew on.
I pulled out a copy of The Art of Electronics by Horowitz and Hill and getting up to speed on emitter followers, buffers, cascodes and the like. Transistor Man (Figure 2.5) is cool. Things like the wide range of Idss values for the same JFET is curious odd.
DT
All Just for Fun!
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Old 6th September 2010, 06:57 PM   #4694
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by SGregory View Post
Now that WAF is much improved, see attached before and after, I can continue with the v1.2 build....
Not an optimal set-up yet since my media room is under construction and will be for some time. But is much better than before..

The Salas RIAA fits perfectly under turntable.
I really like the heavy tables.....

What is the figure on the screen ?
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Old 6th September 2010, 06:57 PM   #4695
Salas is offline Salas  Greece
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DT

96mW dissipation on your 2k2 with 6.6mA passing.
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Old 7th September 2010, 08:51 AM   #4696
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I really like the heavy tables.....
Me too. Here's my VEGA Masterpiece
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Old 7th September 2010, 09:35 AM   #4697
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Me too. Here's my VEGA Masterpiece
Looks impressive, the arm is an original Schroeders? wich cart are you using? the base is Silestone or Corian?

Compared your TT vs ours TT, ours TT seems toys!!!!!
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Old 7th September 2010, 09:40 AM   #4698
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Quote:
Originally Posted by SGregory View Post
Now that WAF is much improved, see attached before and after, I can continue with the v1.2 build....
Not an optimal set-up yet since my media room is under construction and will be for some time. But is much better than before..

The Salas RIAA fits perfectly under turntable.
A little big the TV

The speakers are Proac future diy clons, wich drives & specs, how sounds?

About tube preamps are also diy, wich tubes, topology are you using?
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Old 7th September 2010, 11:15 AM   #4699
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Joaa,
My wife would be very un happy bringing in the boulder you have your turn table setting on. It would be the ultimate TT stand, however. Nice TT by the way;-)

Merlin,
The speakers are my own design based on my experience with Thiel's back in the days. Drivers are Scan Speak Revelators. I am very happy with the sound. "Quasi" first order crossovers. Very hard on the tweeter. +/- 2db down to about 32hZ. What is interesting and happened quite by accident is that they have a very nice impedance characteristics for tube amps.
The Preamp is a 12b4. CLCLC filter regulated by series 0D3. It is in flux right now. Currently using a ccs load with LED bias. I am very happy with sound of 12b4, however, they tend to be feedback prone and noisy. Currently using GE JANs. I have in the works several experimental boards to optimize the design and operating points including discrete CCS and a Gyrator load.



P.S. Am now only missing 2 resistors to complete the V1.2 Build. Mouser has an error in their online catalog. When ordering 0.49R resistors, they send 6.49R resistors. Made the mistake twice now. Should have remaining parts in Wednesday or Thursday.
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Last edited by SGregory; 7th September 2010 at 11:22 AM.
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Old 7th September 2010, 11:52 AM   #4700
Salas is offline Salas  Greece
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1R//1R is the easy solution for 0.5R.
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