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mike stehr

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Everything posted by mike stehr

  1. Okay, about a year or so ago I seen Maynard had posted this amplifier on the forum. It sparked my interest. Could this circuit with James OPTs have the nice sound using Cornwalls like ​my little SEP 6BQ5/EL84 amplifiers? Yet with a bit more power and bass grunt? I have a pair of oak '83 Cornwalls, with K51 mid drivers, Crites CT125 tweeters, and Crites woofers. Crossover networks are charge-coupled B2 version, with Dayton Audio 1% tolerance polyprop caps. I have always enjoyed single-ended tube amps with the Cornwalls, along with a Scott LK48B 7189 PP amplifier for listening to vinyl. I like the Scott's phono stage... I've listened to 2A3, 45, pseudo 300B, and 6BQ5 tubes in single-ended amplifiers. I have a DHT 2A3 stereo amplifier that I enjoy with the Cornwalls. I also enjoy a SEP modded Magnavox 6BQ5 console amplifier, and a DIY RH84 amplifier. I have a small living room, and listen to the Cornwalls in a semi near-field to near-field arrangement. I don't need that much power for moderate to loud levels. The DHT 2A3 amplifier sounds excellent with most genres of music. Triodes like 2A3 have a bit of accentuation in the midrange...great for some music, but not for music like hard metal. The in your face guitar sound of this type of music can be overbearing with triodes. However, with milder rock music, Jazz, Electronica, and rap can really sound good with the 2A3 amplifier. Using the Magnavox SE 6BQ5 amp or the RH84, both amplifiers have feedback. (one from OPT to the first tube's cathode, and the other a type of Schade feedback) These amplifiers don't have the accentuated midrange, and are less forgiving with hard rock and metal. And used within their operating parameters, they can sound rather nice and balanced on the Cornwalls. I would listen to either amplifier with their small output transformers and ponder that it would be great to have this nice SEP sound, but with a bit more power and bass grunt like the 2A3 amp. Don't get me wrong, the little SEP 6BQ5 amps have good bass, it's just limited. So I took a chance and went for Maynard's 6AQ5/6005 SEPP circuit...I started off as a breadboard project, and progressed to completed amp. The thread title is "Parallel 6AQ5/6005 SEP amp". I can't post the link for some lame reason...information about the build is in the thread. There is about six hours of listening time with the amplifier so far. I'm using a Heart/Marantz tubed output CDP for a source, so this evaluation/review is based on CDs. I have a Raspberry Pi2 with HiFiBerry DAC using Kodi for a music server, but I haven't used it yet. I don't have a phono preamplifier for vinyl. At initial power-up the amp sounded a little bright for about an hour or so, and then seemed to settle-in. (or my ears got used to it) I played whatever I could as far as genres. Mancini's "Pink Panther" theme sounded amazing, with strong full bass. 2LiveCrew bumped bass like a car stereo, as it should. You can hear the scratches and noise on the records they used to dub with. I played Nazareth and Rush "Moving Pictures". The track XYZ was impressive, punchy and tight for Cornwalls. Meat Beat Manifesto is Electronica. (I think?) There is deep low bass with this music, the 6AQ5 SEPP pulled it off excellent. Brubeck's "Take Five" sounds wonderful. I have been using the ear-bleed circuit, and it does help tame some harsh music. But I should swap out the 2200 picofarad polystyrene cap for a polyprop or polyester. I feel the effect would be more pronounced using the former dielectric types. This amplifier gives the impression of real low bass, it seems you can hear earth noise...it's that deep. I'm pretty sure this amp has stronger bass being a little more power than the 2A3 amp. But I would have to compare the two amps to determine which gets lower in bass. It's real close. The 2A3 amplifier may have a bit more natural sounding bass/midrange compared to the 6AQ5 SEPP, but I wanted the SEP pentode sound (using some form of feedback) with a little more power and bass. It's pretty much exactly what I wanted. I had never planned on going farther than bread-boarding with the project, but I'm glad I did make a completed amp. Thank you for Maynard for your kind help and guidance. It's been a fun project, and look forward to another! Mike
  2. mike stehr

    lascalas very little bass

    What's wrong with the big JBL?
  3. mike stehr

    Cables, Coffee, and Cocktails

    Through snowdrifts.
  4. mike stehr

    Cap Question

    I'd like to know how someone would go about swapping out caps directly on the fly, and try to discern the difference. The Flash with clip-leads? One way would be to rig up two different networks with different brand/type of caps, and somehow use a DPDT switch to swap between networks. Using just one side of an amplifier, or a mono amp. You could quickly swap between networks, to hear differences. A friend and I did this once with a 2A3 SET, and some large Mitsubishi amplifier...DX some such... We used one speaker with a switch to switch between amps. Once we had the volume levels set even between both amps, switching back and forth quickly showed no differences unless they were really subtle. One's (at least mine) audible memory isn't that quick to note subtle differences. YMMV. But when you take 2A3 amplifier or the Mitsubishi, and listen to one of them in your system for a week, and then switch to the other, one will or should notice the differences. I would guess that this the same for capacitor networks.
  5. mike stehr

    Cap Question

    If you ask me with reference to what Derrick posted, it was more of an apples to banana comparison. You can definitely tell one from the other.
  6. mike stehr

    lascalas very little bass

    You need a pair of Heresies for the top.
  7. mike stehr

    lascalas very little bass

    It's been awhile...
  8. mike stehr

    lascalas very little bass

    Flip them over and there should be a access panel, with screws and a gasket.
  9. mike stehr

    Heritage / HIP Inspired KI-362's?

    Were those originally ported subwoofer (or woofer) cabinets? I would think so...
  10. mike stehr

    La Scala Modification Fact or Fiction?

    When you get to the search bar in the upper right hand corner, right click and select "all content". Then type in ported LaScala. I got 96 hits off the forums search bar.
  11. mike stehr

    FS: Schiit SYS preamp/switch

  12. mike stehr

    La Scala Modification Fact or Fiction?

    Do a search for "ported LaScala"
  13. mike stehr

    foil inductors

    Why? Dean mentioned Solens are junk, and I agree. He also mentioned Jantzen is entry-level cap, and I can agree there, maybe a teeny weeny bit better than Solen. I figured if your going to go sideways with caps, may as well use a cap with 1% tolerance. I mentioned to maybe try and use them. I meant no insult. Why aren't you butt-hurt at Dean for what he mentions?
  14. mike stehr

    X11i ear buds, new $23/shipped Ebay

    Only feedback as a buyer, but the item shows 13 sold in the last couple days for 23 bucks. The person on the eBay account was one name until 2004, then changed to another after that.
  15. Okay. I have always been led to believe that the CT125 used a APT50. I think the Adire HF12 speaker kits used a modified APT50 driver.(little foam pads in the throat) The Adire kits were Eminence 12" woofer with APT50 tweeters. I didn't like the sound of them, and I like the sound of the CT125. Mine are laid back sounding, because I prefer crossing over at 6kHz instead of 4.5kHz. I listen near-field with Cornwalls, and prefer a less in your face tweeter sound. I tried both cut-off points, and preferred 6kHz.
  16. mike stehr

    foil inductors

    Do the speakers sound objectionable to you? Are they lacking something, too much of something? If you don't want to use Audyn Plus caps, maybe use the Dayton/Bennic 1% tolerance caps. Like Dean mentions, I'd be more about upgrading caps if you're searching for better sound. I don't understand the idea of not wanting to spend a bit more for capacitors, but willing to spend a bit on a foil inductor.
  17. Mr. Bill nailed it....I have the CT125 tweeters in my Cornwalls, and they are more laid back sounding. I had a pair of (Eminence) Adire HF12 coaxials that used APT50 drivers for tweeters, and wasn't too thrilled with sound of those coaxials. The APT50 is okay sounding, but a cheap driver nonetheless...
  18. mike stehr

    Very Cool Picture

    "Er, we don't use dome tweeters in our products."
  19. mike stehr

    Cables, Coffee, and Cocktails

    If it was 44 up here, I'd be outside getting things done. I froze up my water source after a 9 degree Saturday night, didn't get the heat tape or insulation over the main valve. ( which is 12" up from the main connection, everything is contained and buried in a 6-8" diameter PVC tube.) Christmas morning I was investigating why it was frozen...reached in there to check the valve, moved it with a bit of a crick and busted the PVC to galvanized connection below the main valve. Instant mess...wide open main to the trailer park...22 degrees outside. Try to find the current manager, sure...called city utilities to turn off the main valve, they are closed of course. Emergency line calls the cops, "broke a main line, gotta turn the main off." "Okay, we dispatched a guy" Took about an hour and a half, poor guy...ripped from his Christmas presents. Fortunately, there is a dip and a creek behind my place, so I made a trench to the creek...but it's a wide open one inch main, so it won't be long before it floods behind other trailers. He get's there and shuts the main off. "You better take care of this before the other places start freezing up." Alrighty then...by now other tenants are finding out they have no water, thinking maybe their places are freezing up AFTER their source. It's not long before folks turn up wanting to get their water back on...one guy and I tore into it an dug it up. Took a bit of bailing until the main line was drained out, and exposed for repair. Another neighbor turned up with proper parts to fix the issue, (nothing was open) he cut the line, glued and capped it off so everyone else can have the water back on without freezing problems. Yesterday the maintenance guy showed up, (we had one?) and I had already been gathering needed stuff for the repair. He could tell I was going to fix it whether he was there or not, and he was getting paid, so he took over. I helped, and worked on my connection from the valve to the trailer, a couple other folks helped as well. One neighbor donated a perfect round slotted fiberglass piece that fit perfect in the PCV tube, and I made sure the heat tape was over that valve. Sort of ruined Christmas day for a few folks, mostly my GF who is a bit upset for missing Christmas with her kids, but what could I do? I couldn't leave... But on the positive side, the water around here was the sort of the color of urine, and kinda tasted bad. That busted line flushed the system rather well, the water is sparkly clean and tastes better! For now anyway... Another positive is we have a next door neighbor, Mr. Happy as my GF calls him. Last Summer I would be at work, and the GF would have her dog out doing his business, and the guy would harass her; "Why hasn't Mike done this?" "Why hasn't Mike done that?" She eventually told him to GFH...a real d*ck, this guy... Well Christmas morning when the utility guy turned off the water, Mr. Happy was right in the middle of his shower...Hah! Hah! He just scowls at me now...what's great is his wife thinks it's funny.
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