Author Topic: I think my System is finally finished  (Read 2553 times)

Offline Nick B

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Re: I think my System is finally finished
« Reply #15 on: February 05, 2020, 11:33:46 PM »
An update on my personal stereo system.

Got the Modi 2 modified some months ago, to the point that I can upgrade it if one wishes. It is indeed world class.

My monoblocks, triode connected, are using Winged C KT-88s with Amperex orange, A frame, PQ 6dj8/Ecc88 made in Holland input/driver tube as reference. (Good luck finding Winged C KT-88s).

As such, I am working with different combinations of currently manufactured tubes to obtain the best quality sound, closest to my reference tubes, with prices people can afford.

This requires that I use two switches so I can find a new manufactured tube combination that "sounds" closest to my reference. The reference was obtain by special proprietary listening tests to make sure the amps do not alter the sonics of the input. (This same procedure was performed with my 10A and perfect 11A line preamplifiers when I was still active. I am retired now.)

Right now I am working with SED KT-88s and JJ 6dj8/Ecc88 tubes. Will report later on findings.

I am hoping this experiment will help others find a tube combo, reasonably priced, that can be made to sound awesome in their components, with some tweaking. Something worth trying that will not break the bank.

cheers
steve

Hi Steve,
Interesting you should mention the Modi 2 made by Schiit. A few years back, Jeff from Sonic Craft was quite enthusiastic on a Schiit dac mod, although I cant recall the model. Iím curious as to what was done to yours and the cost.
Nick
ICEpower 1200as2 amp
Audio Hungary APR 204 preamp
Fritz Carrera 7 BE speakers
Border Patrol SEi dac
Auralic Aries Mini & Mojo Audio lps
Roon, Tidal, Qobuz
PI Audio UberBUSS

Offline steve

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Re: I think my System is finally finished
« Reply #16 on: February 06, 2020, 05:01:11 PM »
An update on my personal stereo system.

Got the Modi 2 modified some months ago, to the point that I can upgrade it if one wishes. It is indeed world class.

My monoblocks, triode connected, are using Winged C KT-88s with Amperex orange, A frame, PQ 6dj8/Ecc88 made in Holland input/driver tube as reference. (Good luck finding Winged C KT-88s).

As such, I am working with different combinations of currently manufactured tubes to obtain the best quality sound, closest to my reference tubes, with prices people can afford.

This requires that I use two switches so I can find a new manufactured tube combination that "sounds" closest to my reference. The reference was obtain by special proprietary listening tests to make sure the amps do not alter the sonics of the input. (This same procedure was performed with my 10A and perfect 11A line preamplifiers when I was still active. I am retired now.)

Right now I am working with SED KT-88s and JJ 6dj8/Ecc88 tubes. Will report later on findings.

I am hoping this experiment will help others find a tube combo, reasonably priced, that can be made to sound awesome in their components, with some tweaking. Something worth trying that will not break the bank.

cheers
steve

Hi Steve,
Interesting you should mention the Modi 2 made by Schiit. A few years back, Jeff from Sonic Craft was quite enthusiastic on a Schiit dac mod, although I cant recall the model. Iím curious as to what was done to yours and the cost.
Nick

Thanks for the inquiy. The sound is so open (of course the speakers are totally gone), superlatives galore. I am not even interested in auditioning another expensive dac/player etc.

The mod included disassembly, working with the tiny pc board holes (working in static type conditions), changing, out boarding output capacitors to Mundorf Supremes, poly a portion of the power supply (analog), Vampire all copper jacks, 6n pure copper wire from Jenalabs. Mount, fasten parts. ~2.5 hours labour since I have it down.


I am figuring ~$599.00 plus shipping/handling without the larger chassis. The customer would point me to the part number and I would order their chassis, or other part selection. Of course, I cannot guarantee the sound quality if they wish custom capacitors.

The photo below uses an old 17" x 10" x 3.5" aluminum chassis, used parts so I can test and easily make modifications. No hole drilled for USB cable. I assume one would want a much smaller chassis, although 2 1/2" minimum height chassis would be needed. Width and Length would be dependent upon layout. For example, the output capacitors could be run directly back from the dac, so the length could be half or less.

Cheers
steve
« Last Edit: February 06, 2020, 05:20:28 PM by steve »
Steve Sammet (retired, owner, SAS Audio Labs)
"V" Very Low Capacitance ICs, 40pf 1 meter
SAS Audio Labs Test Phono Stage
SAS Audio 11A Tube Reference Preamplifier
SAS Audio Labs 25 W Triode Reference Monoblocks
2 way test Spkrs, 28 - 20khz  -3db (28hz)

Offline Nick B

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Re: I think my System is finally finished
« Reply #17 on: February 06, 2020, 06:50:57 PM »
An update on my personal stereo system.

Got the Modi 2 modified some months ago, to the point that I can upgrade it if one wishes. It is indeed world class.

My monoblocks, triode connected, are using Winged C KT-88s with Amperex orange, A frame, PQ 6dj8/Ecc88 made in Holland input/driver tube as reference. (Good luck finding Winged C KT-88s).

As such, I am working with different combinations of currently manufactured tubes to obtain the best quality sound, closest to my reference tubes, with prices people can afford.

This requires that I use two switches so I can find a new manufactured tube combination that "sounds" closest to my reference. The reference was obtain by special proprietary listening tests to make sure the amps do not alter the sonics of the input. (This same procedure was performed with my 10A and perfect 11A line preamplifiers when I was still active. I am retired now.)

Right now I am working with SED KT-88s and JJ 6dj8/Ecc88 tubes. Will report later on findings.

I am hoping this experiment will help others find a tube combo, reasonably priced, that can be made to sound awesome in their components, with some tweaking. Something worth trying that will not break the bank.

cheers
steve

Hi Steve,
Interesting you should mention the Modi 2 made by Schiit. A few years back, Jeff from Sonic Craft was quite enthusiastic on a Schiit dac mod, although I cant recall the model. Iím curious as to what was done to yours and the cost.
Nick

Thanks for the inquiy. The sound is so open (of course the speakers are totally gone), superlatives galore. I am not even interested in auditioning another expensive dac/player etc.

The mod included disassembly, working with the tiny pc board holes (working in static type conditions), changing, out boarding output capacitors to Mundorf Supremes, poly a portion of the power supply (analog), Vampire all copper jacks, 6n pure copper wire from Jenalabs. Mount, fasten parts. ~2.5 hours labour since I have it down.


I am figuring ~$599.00 plus shipping/handling without the larger chassis. The customer would point me to the part number and I would order their chassis, or other part selection. Of course, I cannot guarantee the sound quality if they wish custom capacitors.

The photo below uses an old 17" x 10" x 3.5" aluminum chassis, used parts so I can test and easily make modifications. No hole drilled for USB cable. I assume one would want a much smaller chassis, although 2 1/2" minimum height chassis would be needed. Width and Length would be dependent upon layout. For example, the output capacitors could be run directly back from the dac, so the length could be half or less.

Cheers
steve

Thanks for that info, Steve. Thatís a very nice price, especially because you think so highly of the sound. I was just on the Schiit website and wasnít aware that they had so many products. I now recall that Jeff at Sonic Craft was so enthused over the modded Bifrost. My Border Patrol SE dac resolves beautifully, but Iíd be quite curious how it compares to your Modi 2.
ICEpower 1200as2 amp
Audio Hungary APR 204 preamp
Fritz Carrera 7 BE speakers
Border Patrol SEi dac
Auralic Aries Mini & Mojo Audio lps
Roon, Tidal, Qobuz
PI Audio UberBUSS

Offline steve

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Re: I think my System is finally finished
« Reply #18 on: February 07, 2020, 01:19:50 PM »
An update on my personal stereo system.

Got the Modi 2 modified some months ago, to the point that I can upgrade it if one wishes. It is indeed world class.

My monoblocks, triode connected, are using Winged C KT-88s with Amperex orange, A frame, PQ 6dj8/Ecc88 made in Holland input/driver tube as reference. (Good luck finding Winged C KT-88s).

As such, I am working with different combinations of currently manufactured tubes to obtain the best quality sound, closest to my reference tubes, with prices people can afford.

This requires that I use two switches so I can find a new manufactured tube combination that "sounds" closest to my reference. The reference was obtain by special proprietary listening tests to make sure the amps do not alter the sonics of the input. (This same procedure was performed with my 10A and perfect 11A line preamplifiers when I was still active. I am retired now.)

Right now I am working with SED KT-88s and JJ 6dj8/Ecc88 tubes. Will report later on findings.

I am hoping this experiment will help others find a tube combo, reasonably priced, that can be made to sound awesome in their components, with some tweaking. Something worth trying that will not break the bank.

cheers
steve

Hi Steve,
Interesting you should mention the Modi 2 made by Schiit. A few years back, Jeff from Sonic Craft was quite enthusiastic on a Schiit dac mod, although I cant recall the model. Iím curious as to what was done to yours and the cost.
Nick

Thanks for the inquiy. The sound is so open (of course the speakers are totally gone), superlatives galore. I am not even interested in auditioning another expensive dac/player etc.

The mod included disassembly, working with the tiny pc board holes (working in static type conditions), changing, out boarding output capacitors to Mundorf Supremes, poly a portion of the power supply (analog), Vampire all copper jacks, 6n pure copper wire from Jenalabs. Mount, fasten parts. ~2.5 hours labour since I have it down.


I am figuring ~$599.00 plus shipping/handling without the larger chassis. The customer would point me to the part number and I would order their chassis, or other part selection. Of course, I cannot guarantee the sound quality if they wish custom capacitors.

The photo below uses an old 17" x 10" x 3.5" aluminum chassis, used parts so I can test and easily make modifications. No hole drilled for USB cable. I assume one would want a much smaller chassis, although 2 1/2" minimum height chassis would be needed. Width and Length would be dependent upon layout. For example, the output capacitors could be run directly back from the dac, so the length could be half or less.

Cheers
steve

Thanks for that info, Steve. Thatís a very nice price, especially because you think so highly of the sound. I was just on the Schiit website and wasnít aware that they had so many products. I now recall that Jeff at Sonic Craft was so enthused over the modded Bifrost. My Border Patrol SE dac resolves beautifully, but Iíd be quite curious how it compares to your Modi 2.

I would not mind auditioning yours first if that is ok. I want to see just how close they compare in absolute terms.

Actually, I am using the best coupling cap on the planet (cap went extinct some years ago), but the Mundorf Supreme is a real close second. I would also have to rearrange the caps and button mine down before shipping.

cheers
steve
« Last Edit: February 07, 2020, 01:29:21 PM by steve »
Steve Sammet (retired, owner, SAS Audio Labs)
"V" Very Low Capacitance ICs, 40pf 1 meter
SAS Audio Labs Test Phono Stage
SAS Audio 11A Tube Reference Preamplifier
SAS Audio Labs 25 W Triode Reference Monoblocks
2 way test Spkrs, 28 - 20khz  -3db (28hz)

Offline Nick B

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Re: I think my System is finally finished
« Reply #19 on: February 07, 2020, 08:15:15 PM »
An update on my personal stereo system.

Got the Modi 2 modified some months ago, to the point that I can upgrade it if one wishes. It is indeed world class.

My monoblocks, triode connected, are using Winged C KT-88s with Amperex orange, A frame, PQ 6dj8/Ecc88 made in Holland input/driver tube as reference. (Good luck finding Winged C KT-88s).

As such, I am working with different combinations of currently manufactured tubes to obtain the best quality sound, closest to my reference tubes, with prices people can afford.

This requires that I use two switches so I can find a new manufactured tube combination that "sounds" closest to my reference. The reference was obtain by special proprietary listening tests to make sure the amps do not alter the sonics of the input. (This same procedure was performed with my 10A and perfect 11A line preamplifiers when I was still active. I am retired now.)

Right now I am working with SED KT-88s and JJ 6dj8/Ecc88 tubes. Will report later on findings.

I am hoping this experiment will help others find a tube combo, reasonably priced, that can be made to sound awesome in their components, with some tweaking. Something worth trying that will not break the bank.

cheers
steve

Hi Steve,
Interesting you should mention the Modi 2 made by Schiit. A few years back, Jeff from Sonic Craft was quite enthusiastic on a Schiit dac mod, although I cant recall the model. Iím curious as to what was done to yours and the cost.
Nick

Thanks for the inquiy. The sound is so open (of course the speakers are totally gone), superlatives galore. I am not even interested in auditioning another expensive dac/player etc.

The mod included disassembly, working with the tiny pc board holes (working in static type conditions), changing, out boarding output capacitors to Mundorf Supremes, poly a portion of the power supply (analog), Vampire all copper jacks, 6n pure copper wire from Jenalabs. Mount, fasten parts. ~2.5 hours labour since I have it down.


I am figuring ~$599.00 plus shipping/handling without the larger chassis. The customer would point me to the part number and I would order their chassis, or other part selection. Of course, I cannot guarantee the sound quality if they wish custom capacitors.

The photo below uses an old 17" x 10" x 3.5" aluminum chassis, used parts so I can test and easily make modifications. No hole drilled for USB cable. I assume one would want a much smaller chassis, although 2 1/2" minimum height chassis would be needed. Width and Length would be dependent upon layout. For example, the output capacitors could be run directly back from the dac, so the length could be half or less.

Cheers
steve

Thanks for that info, Steve. Thatís a very nice price, especially because you think so highly of the sound. I was just on the Schiit website and wasnít aware that they had so many products. I now recall that Jeff at Sonic Craft was so enthused over the modded Bifrost. My Border Patrol SE dac resolves beautifully, but Iíd be quite curious how it compares to your Modi 2.

I would not mind auditioning yours first if that is ok. I want to see just how close they compare in absolute terms.

Actually, I am using the best coupling cap on the planet (cap went extinct some years ago), but the Mundorf Supreme is a real close second. I would also have to rearrange the caps and button mine down before shipping.

cheers
steve

Steve,
I just sent you a PM. As Iíve heard of you since Marty DeWulf was writing Bound for Sound many years ago, Iíd very much enjoy your thoughts. Marty raved about your 11A preamp.
Nick
ICEpower 1200as2 amp
Audio Hungary APR 204 preamp
Fritz Carrera 7 BE speakers
Border Patrol SEi dac
Auralic Aries Mini & Mojo Audio lps
Roon, Tidal, Qobuz
PI Audio UberBUSS

Offline steve

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Re: I think my System is finally finished
« Reply #20 on: February 08, 2020, 08:52:33 PM »
An update on my personal stereo system.

Got the Modi 2 modified some months ago, to the point that I can upgrade it if one wishes. It is indeed world class.

My monoblocks, triode connected, are using Winged C KT-88s with Amperex orange, A frame, PQ 6dj8/Ecc88 made in Holland input/driver tube as reference. (Good luck finding Winged C KT-88s).

As such, I am working with different combinations of currently manufactured tubes to obtain the best quality sound, closest to my reference tubes, with prices people can afford.

This requires that I use two switches so I can find a new manufactured tube combination that "sounds" closest to my reference. The reference was obtain by special proprietary listening tests to make sure the amps do not alter the sonics of the input. (This same procedure was performed with my 10A and perfect 11A line preamplifiers when I was still active. I am retired now.)

Right now I am working with SED KT-88s and JJ 6dj8/Ecc88 tubes. Will report later on findings.

I am hoping this experiment will help others find a tube combo, reasonably priced, that can be made to sound awesome in their components, with some tweaking. Something worth trying that will not break the bank.

cheers
steve

Hi Steve,
Interesting you should mention the Modi 2 made by Schiit. A few years back, Jeff from Sonic Craft was quite enthusiastic on a Schiit dac mod, although I cant recall the model. Iím curious as to what was done to yours and the cost.
Nick

Thanks for the inquiy. The sound is so open (of course the speakers are totally gone), superlatives galore. I am not even interested in auditioning another expensive dac/player etc.

The mod included disassembly, working with the tiny pc board holes (working in static type conditions), changing, out boarding output capacitors to Mundorf Supremes, poly a portion of the power supply (analog), Vampire all copper jacks, 6n pure copper wire from Jenalabs. Mount, fasten parts. ~2.5 hours labour since I have it down.


I am figuring ~$599.00 plus shipping/handling without the larger chassis. The customer would point me to the part number and I would order their chassis, or other part selection. Of course, I cannot guarantee the sound quality if they wish custom capacitors.

The photo below uses an old 17" x 10" x 3.5" aluminum chassis, used parts so I can test and easily make modifications. No hole drilled for USB cable. I assume one would want a much smaller chassis, although 2 1/2" minimum height chassis would be needed. Width and Length would be dependent upon layout. For example, the output capacitors could be run directly back from the dac, so the length could be half or less.

Cheers
steve

Thanks for that info, Steve. Thatís a very nice price, especially because you think so highly of the sound. I was just on the Schiit website and wasnít aware that they had so many products. I now recall that Jeff at Sonic Craft was so enthused over the modded Bifrost. My Border Patrol SE dac resolves beautifully, but Iíd be quite curious how it compares to your Modi 2.

I would not mind auditioning yours first if that is ok. I want to see just how close they compare in absolute terms.

Actually, I am using the best coupling cap on the planet (cap went extinct some years ago), but the Mundorf Supreme is a real close second. I would also have to rearrange the caps and button mine down before shipping.

cheers
steve

Steve,
I just sent you a PM. As Iíve heard of you since Marty DeWulf was writing Bound for Sound many years ago, Iíd very much enjoy your thoughts. Marty raved about your 11A preamp.
Nick

Thank you Nick. Sent pm with address. I will take care and will post my thoughts. Yes, both Martin DeWulf and Rich Weiner from Bound for Sound purchased an 11A for each of their reference systems.

The 10A line preamp was one of only three that made the "Exceptional Merit" list of BFS.

Cheers and great week.
steve

ps. BFS did not accept any advertising.
« Last Edit: February 17, 2020, 09:13:39 PM by steve »
Steve Sammet (retired, owner, SAS Audio Labs)
"V" Very Low Capacitance ICs, 40pf 1 meter
SAS Audio Labs Test Phono Stage
SAS Audio 11A Tube Reference Preamplifier
SAS Audio Labs 25 W Triode Reference Monoblocks
2 way test Spkrs, 28 - 20khz  -3db (28hz)

Offline jimbones

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Re: I think my System is finally finished
« Reply #21 on: February 20, 2020, 09:50:03 AM »
ha ha he said over ha ha  :rofl: :rofl: :rofl:
Modwright LS100 Pre, Art Audio Vinyl Reference, Wells Audio Inamorata Pwr, VPI Classic II/Dynavector 20X2L, Two plus Two Speakers,  Roon Rock, Auralic Vega DAC, Emotiva ERC-3, MIT, WireWorld, Wywires, Shunyata, TWL

Offline steve

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Re: I think my System is finally finished
« Reply #22 on: February 24, 2020, 02:18:37 PM »
ha ha he said over ha ha  :rofl: :rofl: :rofl:

Well, I did do one thing this past week. I bypassed my speaker xover  capacitor with a 190pf capacitor.

Secondly, I do need to make my speakers more attractive.

cheers   :D
steve
« Last Edit: April 15, 2020, 09:41:33 PM by steve »
Steve Sammet (retired, owner, SAS Audio Labs)
"V" Very Low Capacitance ICs, 40pf 1 meter
SAS Audio Labs Test Phono Stage
SAS Audio 11A Tube Reference Preamplifier
SAS Audio Labs 25 W Triode Reference Monoblocks
2 way test Spkrs, 28 - 20khz  -3db (28hz)

Offline steve

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Re: I think my System is finally finished
« Reply #23 on: April 15, 2020, 09:55:20 PM »
ha ha he said over ha ha  :rofl: :rofl: :rofl:

Well, I did do one thing this past week. I bypassed my speaker xover  capacitor with a 190pf capacitor.

Secondly, I do need to make my speakers more attractive.

cheers   :D
steve

I am eating crow. I adjusted the 190pf cap to 150pf polystyrene capacitor shunted across a 100uf
polypropylene capacitor. 

I also added one 18 gauge solid wire to the ten 18 gauge solid wires to the "red" speaker lead, while the black speaker lead still uses ten 18 gauge wires. (Coloring the speaker leads makes the explanation simpler to me.) This tiny adjustment is similar to my 1 millionth ohm pot adjustment, and adjusting speaker toe in of 0,5mm or less.

Although each of the three super fine adjustments affects the sonics differently, each also demonstrates the sensitivity of the audio system.

We will see how this adjustment works over time. 

steve
« Last Edit: April 15, 2020, 10:05:27 PM by steve »
Steve Sammet (retired, owner, SAS Audio Labs)
"V" Very Low Capacitance ICs, 40pf 1 meter
SAS Audio Labs Test Phono Stage
SAS Audio 11A Tube Reference Preamplifier
SAS Audio Labs 25 W Triode Reference Monoblocks
2 way test Spkrs, 28 - 20khz  -3db (28hz)

Offline jimbones

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Re: I think my System is finally finished
« Reply #24 on: April 16, 2020, 05:34:44 AM »
I don't see how a 190pf cap could materially affect the SQ of the crossover. I've been designing and building for years and my experience has been that generally you need a cap of significant percentage to improve the SQ. I have tried using a 0.22uf cap in parallel with a 7 uf cap and didn't really notice. Some publications say it needs to approach 50% of the total value.
« Last Edit: April 16, 2020, 08:41:32 AM by jimbones »
Modwright LS100 Pre, Art Audio Vinyl Reference, Wells Audio Inamorata Pwr, VPI Classic II/Dynavector 20X2L, Two plus Two Speakers,  Roon Rock, Auralic Vega DAC, Emotiva ERC-3, MIT, WireWorld, Wywires, Shunyata, TWL

Offline steve

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Re: I think my System is finally finished
« Reply #25 on: April 18, 2020, 10:35:30 PM »
I don't see how a 190pf cap could materially affect the SQ of the crossover. I've been designing and building for years and my experience has been that generally you need a cap of significant percentage to improve the SQ. I have tried using a 0.22uf cap in parallel with a 7 uf cap and didn't really notice. Some publications say it needs to approach 50% of the total value.

There are several reasons. Also those "rules of thumb" one often sees on forums are almost always inaccurate.

1. The venue might be, maybe one. No obvious echos.

2. The best, most accurate/natural sounding capacitors have been extinct for some years due to improper "testing" and "comparisons", individual and article capacitor comparisons alike, and then posting their results on audio forums. So what you have are 2nd rate caps these days.

3. Not the best designs, which includes values, ratings, biasing etc. A few equations won't design a
preamplifier or amplifier. It takes a whole lot more than that.

4. No one has developed or seems to use any specialized listening tests to determine if their resultant product is actually accurate across the audio frequency range. Claims of sounding good, "to die for" 
really means little,,, and compared to what. Granted some musical selections are not that accurate, so it probably doesn't make much difference anyway to most people.

That 150pf bypass cap affects the ultrasonic frequencies, thus rise time (attack time). The ultra sonic response affects everything down to the bass in a top notch system when masking is minimal to non existent.

By the way, the crossover capacitor is over 530,000 times larger than the 150pf cap. That information tells us how sensitive my speakers are, the lack of masking is incredible. Another way of putting it, there is virtually no sonic signature.

But it took decades creating the near perfect preamplifier, near perfect amplifier (I have been told to never say always, never, or perfect), interconnects, speaker "cable" setup, and then 7 years on the speaker and sources (Phono and DAC).

5. Because of the previous points, that is why 1 in a million value resistance change in a speaker control, the number of 18 gauge speaker wires in parallel, 0,5mm toe in of the speaker change, makes a sonic difference.

By the way, I had to remove that 11th 18 gauge wire to the red speaker jack. I am testing 9 leads on the red terminal and 10 to the black terminal. I probably should have tried one at a time sooner. 

Update, after some tweaking with an inductor (about 1" more wire was added to a turn), 9 wires sounds better than the 10 turns I have been using. Will continue to test over the entire audio band.

cheers

steve
« Last Edit: April 26, 2020, 09:27:19 AM by steve »
Steve Sammet (retired, owner, SAS Audio Labs)
"V" Very Low Capacitance ICs, 40pf 1 meter
SAS Audio Labs Test Phono Stage
SAS Audio 11A Tube Reference Preamplifier
SAS Audio Labs 25 W Triode Reference Monoblocks
2 way test Spkrs, 28 - 20khz  -3db (28hz)

Offline steve

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Re: I think my System is finally finished
« Reply #26 on: May 11, 2020, 03:01:22 PM »
Well, a customer purchased and sent me a Supra usb cable as a present, and I am testing it.
It made a difference and is a superior usb cable, more live sounding than the double shielded gold plated
plug cable I was using.

The realism of the instruments and voices, the transparency is mind blowing.

steve
« Last Edit: May 25, 2020, 07:02:02 AM by steve »
Steve Sammet (retired, owner, SAS Audio Labs)
"V" Very Low Capacitance ICs, 40pf 1 meter
SAS Audio Labs Test Phono Stage
SAS Audio 11A Tube Reference Preamplifier
SAS Audio Labs 25 W Triode Reference Monoblocks
2 way test Spkrs, 28 - 20khz  -3db (28hz)