pnort

I'll be interested to hear whether the new amplifier design is expected to be more reliable than the current design. Hopefully the components subject to overheating will have been beefed up and located away from other sensitive components.

oily rags are subject to spontaneous combustion, especially if left in a bunch. Here is what PWK suggested... Klipschletter3.pdf

Here is the third letter from Paul Klipsch that you may find interesting. Klipschletter3.pdf

I started in on hi-fi when I was about 13 back in the mid-50s and little phono players weren't cutting it playing Elvis or Cash or Hank Snow. At my local record store I saw some Aristocrat speakers that I liked the idea of and one weekend I built a knock-off of the design out of some 3/4-inch plywood (I think back then it actually was 3/4-think -- now now quite so much). I was able to convince my parents to buy me a University model 312 tri-ax speaker that served me well until the end of the 60s when the power transformer in my 24 Watt amplifier died and I could find an exact replacement. My scepticism of stereo was also wavering because all the amplifiers for sale by that time were stereo rather than predominately mono. I wound up building a Heathkit AR15 stereo, but now I needed two speakers and couldn't find a University 312 so I started auditioning speakers at audio stores. Nothing seemed satisfactory until I listened to Klipshorns at a store in north Syracuse. After some correspondence with Paul Klipsch (attached) I bought one and paired it with my Aristocrat knock-off until I could the second one. I don't have the homemade Aristocrat anymore but my favorite memory of it from back in the 50s was wanting to know how far away the music would carry. I put the speaker in our back yard, ran a wire up from the 24 Watt Knight amp in the basement, dropped the needle on some rock&roll, jumped on my bike an got a couple blocks away before the record--a 78--ended. Back home there was a crowd of neighbors standing around the speaker listening to the 78-cycle thump of the record end groove, not knowing how to turn it off. Klipschletter1.pdf Klipschletter2.pdf

Look at Elekit amps and review in Stereophile magazine for SET amp in the under $2500 range. No wood box though. I built the 8600S and like it very much.

In case you don't know -- The 8600S Elekit uses the Lindahl transformers -- yes.

Can one of you experts please provide a tutorial on how you use an oscilloscope to evaluate caps. Thanks

Lots of options on craigslist where I live. I bought a Yamaha for my son recently for $50.

I built an Elekit 8600S 300B tube kit. It sounds good with my 1970 Klipschorns. I'm using Western Electric 300B tubes. Mostly good instructions for the kit.

I built an Elekit 300b kit for my Klipchorns and really like it. You can buy them assembled if you have more cash than time. I'm using the new Western Electric tubes. Plenty of power for the K-horns. I have a Vincent Pho 701 for phono preamp and the combination is good.

How about some spectral data on JEM vs Crites caps? Sonicare, Dayton and JEM brand. There have been some published data on the subject, but I haven't seen anything specific to our choices as Klipsh fans -- example https://www.audiosciencereview.com/forum/index.php?threads/capacitor-upgrade-in-crossover-is-it-audible.12287/

Just my opinion but I don't care for the bickering over the choice/source of replacement capacitors. To believe it's even audible, I have to see some spectrum comparisons -- that is, data. Otherwise it's just opinions. Happy Thanksgiving Klipsch fans. I'll be listening to my 72 KHorns with caps I replaced about a year or two ago. Pnort

How are you all measuring or calculating the sound level you're reporting? Calibrated microphones? I need a clue here

Bass instinct: low notes really do get people dancing, research finds https://www.theguardian.com/science/2022/nov/07/bass-instinct-low-notes-really-do-get-people-dancing-research-finds Neuroscientists show clubbers move more to very low frequencies, even though they are not consciously detectable When it comes to getting into the groove on the dancefloor, it really is all about the bass, researchers have found. Scientists say when very low frequency (VLF) sound was introduced during a live electronic music event, gig-goers moved more even though they could not hear the frequencies. “This is real world – real electronic music dance concert – validation that the bass really does make people dance more, and this isn’t just something that comes from our conscious awareness,” said Dr Daniel Cameron, a neuroscientist and first author of the work from McMaster University in Canada. Cameron and colleagues note that previous studies suggested music that induces dance has more low frequency sound, and that low pitches help people to move in time to music. Writing in the journal Current Biology, the team report how they set up an electronic music concert by the Canadian duo Orphx at McMaster and asked attenders to wear motion-capture headbands before turning on and off specialised VLF speakers every 2.5 minutes during the 55-minute performance. Results from 43 attenders who agreed to wear a headband revealed they moved 11.8% more, on average, when the VLF speakers were turned on. Cameron noted this meant people danced more vigorously, or with more exaggerated movements. At the end of the concert, 51 attenders completed a questionnaire that asked whether they could feel the music in their body, and whether the bodily sensations affected their compulsion to move. The results suggest the concertgoers experienced bodily sensations associated with the music, but that these feelings were not rated as stronger than at similar concerts – settings where VLF speakers are not typically used. The team then conducted a further experiment in which 17 people were asked to distinguish between a pair of clips from the concert that were identical, and a pair that differed only by the presence or absence of the very low frequencies. The results from 72 such trials revealed participants did no better than chance at telling the pairs apart. Cameron said that backed up the conclusion that concert attenders were not consciously aware of any influence of the VLFs.

Travis of Austin, Were the router bits that heated up on the birch plywood steel or carbide? I'm not sure what was available back in the "old days".

I built an Elekit 8600S about 8 months ago. It is very good. You can read the professional reviews online. For phono, I have a Vincent Pho700 preamp

I have a Vincent Pho 700 for my turntable to boost the signal going into an Elekit 8600S amp. The Vincent Pho is very good but has no volume or other adjustments. Elekit has a volume knob. My speakers are early 1970 Klipschorns

The picture of the speakers out on the lawn brought back a memory of my early days in 'hi-fi'. I'd gotten a 24 Watt Knight tube amp with 5881 tubes and a University 12 inch triax speaker and build a knock-off cabinet from inspecting an Electro-Voice corner cabinet. I was a curious and unthoughtful kid. I wondered how far away I could hear my set up from my house. Took the speaker into the back yard and ran a wire from the amplifier. Dropped on an early Pressly 78, got on my bike and rode north. Audible from at least two blocks away. As the needle recirculated in the groove at the end of the record, my speaker was surrounded by neighbors trying to figure out how to silence it. Now I only have 9 Watts per channel to pour into my early-70s Klipschorns, but that seems more than enough. Can't easily take them out on the lawn to test their range.

https://eepower.com/technical-articles/how-gan-fets-have-become-the-technology-of-choice-for-audiophiles/# How GaN FETs Have Become the Technology of Choice for Audiophiles November 29, 2021 The noise spectrum is the biggest issue. GaAs devices had a lot of low frequency (1/f) noise. Data in this article suggests that GaN has less than silicon devices. Of course it depends upon what type of device is used-- bipolar, MOSFET, or jFET. I don't know the details on that question. Generally GaN would be used in cases where high power is important. Not particularly the case for high-efficiency speakers. I'm personally enjoying Western Electric 300B tubes in an Elect 8600S. Three clicks of the volume and I'm there in spite of being "hard of hearing".

As a retired scientist I wonder about this tube-break-in mythology. Has anyone measured the amplifier spectrum as a tube ages? Not that I imagine that peoples ears get used to an amplifier over time... just asking for a friend. Peace be the journey

A question -- did we ever learn what capacitor brand JEM/Klipsch use? Maybe the moderator deletes any postings with that information, yet we know what Crites uses. It would seem fair to know what JEM/K uses for comparison, and cost difference for upgrades. Peace be the journey.

Some interesting information on capacitors on this forum: https://www.audiosciencereview.com/forum/index.php?threads/capacitor-upgrade-in-crossover-is-it-audible.12287/ A few takesways I noticed-- 1. Differences in the sound may be dominated by differences in actual capacitance values when "upgrading" capacitors 2. Effective series resistance of electrolytic capacitors is typically higher than film capacitors. 3. There are three parts to the review and it's worth looking at this if you are contemplating renovating your crossovers. I did some other poking around the question of capacitor reliability. Whether "old" capacitors need replacing, if at all, should be significantly affected by the time they've spent at elevated temperatures. If your speakers have lived in the house at temperatures comfortable to you, the capacitors will probably last a long time. If they've been in long-term storage in a hot attic or garage or shed, then maybe they need renewal. I'm old and my hearing hasn't improved with age. Still like my '72 Khorns and a new Elekit 8600S with Western Electric 300B tubes. Peace be the journey.

I'm confused about Jubilees -- why are these two-way speakers superior to the Klipschorn three-ways?

I have one of these pho700 preamps and I like it a lot. Dead quiet going into a 300B tube amp I built from an Elekit TU-8600S. I bought a Telefunken tube for it.

Thank you for the Recipe and TAA articles Diz