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rhing

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About rhing

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  • Gender
    Male
  • Location
    Twin Cities, Minnesota
  • My System
    Rebuilt vintage Kenwood PC-450U belt-idler wheel drive turntable, Talisman Alchemist IIB MC cartridge, Sony ES NS999ES DVD/SACD/CD player, Audio Research PH5 vacuum tube phono stage preamp, Audio Research LS7 vacuum tube line stage preamp, rebuilt McIntosh MC240 vacuum tube power amplifier, rebuilt and modified Dynakit Stereo 35 vacuum tube amplifier, Wiener 2.0 TI TPA3118 PBTL (dual mono) Class D amplifier (diyAudio.com group buy), TI TPA3255EVM BTL Class D amplifier, rebuilt and modified Klipsch Forte II floorstanding speakers, KEF LS50 bookshelf speakers

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  1. When I lived in the San Francisco Bay Area several years ago, I had an opportunity to attend the San Francisco Vacuum Tube Users Group where the group had a shootout between several vintage tube amps of varying designs including the Marantz 8B. The group used to meet at the Randall Museum auditorium which sat maybe 100 to 175 people and used a pair of Klipsch Chorus II speakers. Among the amps which included a fine our of Fisher monoblocks (sorry I do not recall which ones), the Marantz 8B was the most musical amp of the group. Like vintage Mac tube amps, you would have to carefully search for a Marantz 8/8B in good shape or properly rebuilt. With careful shopping, you will be rewarded for your efforts.
  2. Wish I could join, but I just moved back to South Carolina from Minnesota. I now have my full complement of amps working with my Klipsch Forte II’s.
  3. When I still lived in California several years ago, Roger Modjeski was generous in coming to my home and joining other friends to try a few of his tube amps including his RM-10 MkII EL84/6BQ5 amp in my system, which includes an upgraded pair of Klipsch Forte II’s. We compared it to my Dave Gillespie EFB-modified, rebuilt Dynakit Stereo 35 tube. Even though I have not heard the Forte III’s, I would think they perform similarly as my Forte II’s based on their specifications. From our listening sessions performing a true blind ABX comparison with matched levels, the RM-10 MkII and Dynakit Stereo 35 were very close in performance. That said, both amps sounded fantastic driving the Klipsch Forte II’s with a wide range of material. You will need an equally great preamp and source to work wonders with the RM-10 MkII and Klipsch Forte III’s. My tube line stage is an Audio Research LS7, and this combination was stellar. The RM-10 MkII is among one of my favorite amps. Roger put a lot into that amp’s design with custom wound transformers, point-to-point wiring and a solid tube biasing system.
  4. I would also recommend using the Dueland DCA16GA or DCA12GA Cotton-insulated, Tin-plated Copper wire for speaker wire. It’s not terribly expensive, and you’ll be amazed at how this wire will enhance your listening pleasure.
  5. Nice work. I used some Dynakitparts.com components in restoring an original Stereo 35. I went further and purchased Dave Gillespie’s Enhanced Fixed Bias (EFB) circuit board to improve the performance of the amp. The EFB modification reduces distortion, increases headroom and extends power tube life. I highly recommend this modification of an already fine amp. http://tronola.com/html/daves_store.html You will be rewarded with cleaner and smoother mids and highs, and a better defined bass. It sounds like the amp is weightier and more powerful, but still maintains that rich EL84/6BQ5 tone.
  6. Well I’ve finally moved to a home with a dedicated listening room and I have been able to get a lot of my equipment out of storage and hook up my Klipsch Forte II’s to the Pass DIY Sony VFET amp. Wow! I thought the Pass amp amp performed exceptionally driving the less efficient KEF LS50’s, but this combination of the Klipsch Forte II’s and Pass DIY amp is on another level. I feel like this amp was made for speakers like these. The bass is deeper with more punch and the whole package is more dynamic and lively, but still very refined with detail, tone and timbre. The soundstage is huge and deep as most people have observed with this amp. I was also able to get my rebuilt McIntosh MC240 tube P-P amp out of storage and I plan a shootout between “Papa” (what most people at diyAudio.com refer to Nelson Pass as) and “Mac Daddy” (my MC240).
  7. Joe, You did a tremendous job with building both of those amps. Your dual-mono Sony VFET has to be challenging with the tight quarters of the chassis. I am curious how the Burning Amp compares to the Sony VFET amp. The reason I ask is because a good friend of mine used to own a Pass Labs Aleph 3 years ago and regretted selling it. Is the Burning Amp remotely close to the Sony VFET in terms of sound quality, and how many watts does the Burning Amp output? He owns a pair of KEF Reference 101 monitors (basically BBC LS3/5A monitors with an 8 ohm nominal impedance). Rich
  8. After about 15 hours of total play time, this amplifier is starting to settle in. The bass notes are more complete with detail, depth and sustenance. The soundstage is still growing in all three dimensions, separation and space are coming into better focus, and the dynamic range has also increased with greater slam and transient response. This is a very solid amplifier and I can certainly understand why many would prefer this amp over a tube amp. In fact, it bears some resemblance to my McIntosh MC240 6L6 push-pull stereo amp with that holographic presentation, warmth and body. Even though my Forte II's are in storage, my KEF LS50's are doing a respectable job of creating room-filling sound. I can understand where many Klipsch Heritage or classic Altec horn-based speaker owners would be very pleased with an amplifier of this calibre generating 15 high quality watts into 8 ohms. I have posted on these forums about my push-pull tube amps and some really good Texas Instruments Class D amps, and this Nelson Pass designed amp is one of the best in my amplifier collection. It really has the soul of a tube amp, but it also has the desirable hallmarks of a solid state amplifier. It is an incredibly musical amplifier that allows me to get lost in the music. I really cannot rank my amps, because some are in storage or just don't work well with my KEF LS50's for a fresh comparison, but what I can say is that I will be keeping this Pas DIY amp in my system for a while.
  9. Well I finally completed my Pass DIY Sony VFET amplifier project. With tremendous help from Chuck, a fellow diyAudio.com member, on the Sony VFET bias settings, I have completed my build and I am very impressed with this amp with only 6-7 hours of music playback. As I previously mentioned, I purchased a set of untested (unmatched) Sony VFETs from wdecho that he bought from Acronman a while back. He also included a pair of the T-brackets, mica insulators and a pair of the PCBs. After budgeting my money and purchasing all the parts through Mouser, Parts Connexion, the diyAudio store and the local Ace Hardware, I set off on measuring and matching resistors and capacitors and followed 6L6's excellent build guide and Nelson Pass' instructions. Chuck really helped me with biasing the Sony VFETs and then we set it up in his system to audition the amp. The DC offset was kept well close to 200mV on each channel with the final settings. Having a great local resource like him in the Twin Cities is a real blessing. It sounded like a freshly built amplifier on his very efficient horn speakers. We then tested it with his distortion analyzer to see how closely matched each channel was since the VFETs were not tested and matched by Nelson Pass. The photo shows the spectral analysis for the right channel, which looks great. To my pleasant surprise, the left channel was virtually identical to the right channel. THD on the right channel measured 0.0130% @ 1 watt, while THD on the left channel measured 0.0135% @ 1 watt. It was time to close up the chassis and take it back home to enjoy. I plugged the amp into my system consisting of an Audio Research vacuum tube phono stage, an Audio Research vacuum tube line stage and a pair of KEF LS50 monitors. This amp has no problems driving the KEF's with the gain from my ARC LS7 line stage preamp. Chuck advised me to give this amp a lot of hours for it to really settle in, but I have to say that I am already impressed. The sound is so natural and clear. This is my first Pass DIY (and solid state amp) project ever, and just following Nelson Pass' documentation, 6L6's build guide on the diyAudio.com forum, and sage wisdom from wdecho and Chuck really made this project a success.
  10. This looks really compelling and I have 2 matched pairs of the Toshiba JFETs that I was considering for a Pass DIY F5 Turbo build. The most intriguing version is the single-ended Mountain View version using available Fairchild JFETs. Right now, I am building the Pass DIY Sony VFET push-pull amplifier using parts that wdecho sold to me earlier this year. I hope to complete this amp by Christmas, and I will post photos that chronicle the build process.
  11. Well all I can say is that wdecho has been extremely helpful in my quest to build a Pass DIY Sony VFET Class A amplifier. He sold me a rare set of the Sony VFETs along with the First Watt printed circuit boards, Aluminum heatsink mounting brackets, and he has shared numerous DIY tips with me and many here on the Klipsch community forums. The Class D amplification thread that wdecho initiated was very informative and a great exchange of ideas on coupling new amplifier technology with vintage Klipsch Heritage speaker systems. I am not aware of what happened here, but I still correspond with wdecho on a DIY forum, and he remains generous with his knowledge and very courteous.
  12. What happened to the Class D thread started by wdecho? I noticed he’s no longer a forum member either. Odd 🤔
  13. rhing

    Why I DIY

    Hi wdecho, Thanks for pointing out the Toshiba JFET seller on eBay. I will purchase a set tomorrow. I am confident the F5 Turbo V2 will sound very good in my system. I will take my time in acquiring all the parts and build the amp as the weather turns cold. Then I can use the amp as a space heater too.
  14. rhing

    Why I DIY

    Just want to let folks here know that this thread has inspired to build a Pass DIY F5 Turbo (V2) amp using PCBs and a 5U chassis from the diyAudio.com store. The 50 watts @ 8 ohms rating is really more for my KEF LS50 speakers than for my Klipsch Forte II’s, but I am sure that it will sound great with the Klipsch speakers too. Hopefully, when I finally move into a larger home and get my stuff out of storage, I can compare the F5 Turbo to my Texas Instruments TPA3255EVM Class D amp and McIntosh MC240 tune amp. I am preparing a BOM for parts and I will have to wait for the availability of the JFETs from Linear Systems.
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