Description

My system is an old school 2-channel stereo setup with a lot of poor man's high end and DIY touches, and has an active sub (or two depending on who's home)...modern terminology is 2.1.  The speakers, preamp, and main tube amps have been part of the system since around 1990, but have undergone several upgrades and refinements since.  My hands inside most of my system, including the DAC.  It's a great way to own better sounding gear than budget allows, and gives me a better understanding of what's under the hood.  

It's been my good fortune of having Bobby Palkovic from Merlin (RIP), and Ken Stevens from Convergent (CAT) as friends and audio mentors since the mid 80s.  They've shaped my tastes, enhanced my audio knowledge, and inspired my pursuit of better audio.  I worked with Bobby at Merlin while they were in Rochester, and met Ken through him.  We did several CES shows together from the mid 80s to early 90s.  Exposure to the insights of these two brilliant minds, plus exposure to the level of gear they were surrounded by has been an immeasurable influence on my audio journey.  No doubt my system would be very different today had I not met them.  This system impressed me nearly 35 years ago, and has continually improved with refinements over time.  

In 2023 the system got reconfigured into a tube/SS hybrid bi-amp configuration, and I've continued to improve on that configuration since.    The original passive low pass filter was bypassed, and an active low pass crossover was added to limit frequencies above 63hz to the amp .   The result was a fairly simple and affordable improvement on multiple levels (IMHO).  The tube amps got an inline high pass filter in 2025 also, which made another very notable improvement in overall clarity.  

January 2026 - I completed the build and installation of a Hagerman Cornet 3 tube phono stage.  Very nice upgrade.  Also added a Miida T3115 turntable to the mix.  Some new Tung Sol ECC803S gold pin 12AX7s were added on the output side of my Lazarus preamp around the same time.  Life is good these days! 


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Room Details

Dimensions: 24’ × 20’  Large
Ceiling: 9’


Components Toggle details

    • DYNACO/VTA tube / Linn LK-140 SS Amps (Twin Dynaco 70s used as mono blocks w/VTA boards & Linn LK140 SS amp - biamped)

    My first Dyna amp was a Dynakit 70 that my uncle built in 1964.  He gave it to me in the late 80s.  I acquired a 2nd Dyna factory wired ST-70 a couple of years later.  A friend beefed up the power supply caps a bit, and refreshed many other parts, and I used these as one-sided monoblocks for 20 years...they replaced a very good Distech LS-2 amp (which is essentially a modified B&K ST-140).  

    The amps got rebuilt in early 2020 with the VTA circuit boards, new quad caps, new Convergent audio coupling caps, new tubes, and I wired them in a passive vertical bi-amp configuration.  Later on, I removed the tube rectifier and replaced it with a SS diode plug-in, and put it all on a variac to reduce the impact of inrush current.  After some trial and error with several tubes and configurations, I ran Gold Lion KT66 outputs for about a year, then had a nice fling with the Tung Sol 7581A that I may go back to, and am currently running Tung Sol 6550s, RCA 12AU7 clear tops, and EH 12BH7a as driver tubes, and am running each amp as monoblocks, using only one side of each amp, which allows some additional tube choices.  

    In 2023, the bi-amp configuration went from vertical/passive to vertical/horizontal, active/passive, tube/transistor hybrid using the tube amps on the midbass and treble from the lower vocal range and up, and a solid state amp to power the woofers. 

    As of December 2025 there's now a Linn LK140 solid state amp powering the 8" Focal woofers in the transmission line of the speakers, which runs <63hz with an active low pass crossover, and also feeds the high level inputs of a powered Definitive Technology PF15 subwoofer..  After adding the active low pass filter, I installed an inline high pass filter on the tube amps @ ~ 63hz....another very notable improvement.  It lets the tubes handle the whole vocal range, and leaves the SS amp to control the large excursions of the woofers....best of both worlds.


    • LINN LK-140
    This is a Linn LK140 solid state amp I picked up to power the lower octaves of my rig.  It replaced an old Kenwood KA-3500 in November 2025
    • Lazarus Cascade Basic Preamplifier

    I bought this new in the early 1990s from Paul Heath Audio.  Very nice sounding reasonably priced tube pre-amp in its day (~ $600).  I freshened it up with new Convergent caps, new resistors, and new tubes this spring.  It's been a fine sounding piece, and love the low profile look with the bold red lettering on the black face.

    In late 2024 I found another slightly earlier version of the Lazarus on Reverb, and picked that up.  It got the same updates as my main Lazarus preamp, and serves as a backup (or loaner).  

    • Sterling Acoustics Acumen II

    These were made by my small company in Rochester, NY around 1990, and are the heart and soul of my system. They were the culmination of years of being in business and around the business.  Focal 8K kevlar woofers in a transmission line, Focal 5k midbass with an aperiodic chamber that dumps into the transmission line, modified Seas tweeter, proprietary crossover with top shelf components. The side walls are an MDF sandwich with a silicone rubber between the panels.  

    The crossover has it's own chamber, is wired with Kimber Kable teflon coated OFC copper, Litz wire inductors, Convergent Gen 1 caps, and non-inductive resistors.  It took nearly 5 years to dial in the crossover values before I moved them inside the speaker.  Each driver has its own solid copper input. 

    I sold off my Merlin 4 speakers more than 30 years ago to fund the parts for these, and have loved them since finalizing the crossovers.  They've continued to reveal every component or configuration upgrade I've made.  They have a coherent, vibrant, and natural relaxed clarity with a vivid soundstage.  Not sure what more I could ask anywhere near what I could afford.


    • Denon DCM-440
    25+ year old CD player with 5-disc carousel and remote.
    • Modified SMSL C100 DAC

    A Topping E30 was added to my CD player's digital output in 2021.  Wasn't sure what to expect, but it made an audible improvement.  

    Edit October 5, 2024:  My E30 failed after 3 years (I suspect due to a wall wart failure), and was replaced by an SMSL C100 that's modified with a MUSES02 opamp (thanks to my good audio buddy "oranda"), and has a DIY linear regulated power supply... a very notable upgrade!

    • Sansui SR-1050E
    Found this beautiful vintage piece in mint condition locally and was happy to give it a new home. It came with the original Sansui cartridge, but have added an SAE 1000E LOMC cart to it. This has recently been installed as my main TT, and I swap out my Nagaoka and SAE carts on it.

    This TT was put into the main system in late 2024, along with my FrankenNag MP150/500 or the SAE 1000LT.
    • Hagerman Bugle 3

    The Hagerman Bugle 3 phono stage got added recently, mainly because I was having some issues with  the phono section of my vintage Lazarus tube preamp.  It's a nice sounding unit for the money, and can be pretty easily modified, which appeals to my urge to experiment.  I've upgrade the power supply significantly, along with the op amps, and some key resistors and capacitors in the signal path.  It's sounds extremely good these days, and is a welcome addition.

    • Audio Technica LP-120XUSB

    This was a gift from my kids a while back.  I sold my AR-ES1 with a Premier MMT arm and Grado Signature 8 many years ago, which I’ve regretted ever since.  This is the newer version of the LP120"X" that offers some fixes and sound improvements over the former LP120.  I upgraded the stylus to the nude Shibata, upgraded the RCA cables, added a cork mat, damped the underside of the platter with Flexseal, lined the plinth with modeling clay, added O-rings to the tonearm, and weighted grip tape to the counterweight to move it closer to the pivot point.  I also added a zebra wood frame, sorbothane feet, a Brute record weight, and have since upgrade the VM95SH shibata to a Nagaoka MP150 with the MP500 nude line contact profile and boron cantilever....what a fantastic cartridge!  I'm duly impressed with the sound I'm getting from this humble TT, and it’s performance has been enhanced by the addition of a modified Hagerman Bugle 3 to my vinyl playback.

    • Garrard Type A70 Mk II
    This was a 60's era turntable owned by my uncle.  It worked when I got it, but needed more work than I could give it to restore it's original functions, so I stripped away the automation, added a Marantz tonearm with an updated nude elliptical stylus on a Pickering cart, and a custom plinth to make a respectable sounding fully manual table.  I offered this to my son as part of grad school graduation gift.
    • Thorens TD-124 MkI / Ortofon ESL S1000 Gyro Balance Tonearm
    This belonged to my cousin's grandfather.  She mentioned having an old TT in the basement, and offered it if I was interested.  My eyes bugged out of my head, and I stammered a lot when I saw it...I was fully expecting something along the lines of an old plastic BSR, etc.  Wow. A precision beast of an overbuilt machine if I ever witnessed one.  Made in 1958, in excellent condition, not working, but fully intact.  I cleaned it up, did some research and maintenance, and it's alive and well again.  It's back in the hands of my cousin now, and being used regularly.
    • Miida T-3115
    Direct drive turntable made by Denon.  Same as a Denon GT700 and SL-D7. A new to me acquisition in 2025.
    • Hagerman Cornet 3
    Just completed at the end of January 2026.  Tube phono stage built from a blank PCB.  I upgraded several caps and resistors, put it in a steel case, and added a regulated LPS.  EH12AU7, and two Mullard CV4004.  Oh man...this is living!

Comments 8

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Owner
@tomic601 Thank you Jim.  I appreciate your comments!

knotscott

Owner
Thank you Jim.  I appreciate your comments!

knotscott

Owner
@devinplombier - Thank you!  Indeed...it's been a great journey!

knotscott

Owner
Thanks Alan - Mine are Sterling Acoustics, made by me in Rochester, NY.  Not many of those either, but are yours are the Castle Acoustics Stirling speakers made in the UK?  They're nice looking from the pics I've found.

After making and selling many pairs of four other models of the Sterling Acoustics line (and one made by Sterling Acoustics for Masterpiece Audio Products), I really fell hard for the Acumen II and kept them after I closed the business.  No regrets keeping these...after 30 years they still hold my attention.

Still love my tube amps and preamp too!  Good luck!

knotscott

Owner

knotscott