hirsch
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Posts posted by hirsch
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A belated thanks for all of the birthday wishes!
I haven't been online very much lately due to a surprise change in my circumstances (surprising to me, at any rate). I'm now engaged to be married. 58 years of bachelorhood coming to an an end.
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I just sold an HD650 to CJ. Great communication and prompt payment. I'd deal with him anytime.
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I sold an HD-580 to Dinny. Communication was great, and payment was rapid. Can't ask for a better person to deal with.
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I've had this amp since July 10th. I'll post a review in a bit. However, the short version is that it's the first amp I've owned that lets me enjoy the K-1000 enough to make it a daily user. More coming soon.
[ATTACH=CONFIG]3542[/ATTACH]
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Sad news indeed. I've been a fan for a lot of years. The Fugs Final CD Part 2 came out this year, but I was hoping for a much longer running series. One of the most influential musician/poets that few people ever heard of. RIP.
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Bought a headphone from Justin. Came packed perfectly and looking like new. He's a great guy to do business with.
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I was really hoping to get to this one, but a conflict came up and I've got to go down to NC instead. I will get to another one of these if I have to host a DC Canjam myself. I may curse myself for having written that.
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I can think of a lot of ways in which that would not be the case, it would depend entirely on the provisions contained within the contract which I know for a fact that I haven't seen.
Government polices on personal use of government computers/software are actually pretty lenient up to a point. However, it is absolutely illegal for a federal employee to use a government-owned system for personal profit. It would have nothing to do with any software licenses or contracts at all, but rather the government's policies for use of equipment that it owns.
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Tube munching was a rumor. Quite a few people have had the same set of tubes in a melos for years of use.
I dont agree with better sound for the money, but Im biased.
I haven't changed tubes in mine for at least six years. I use Telefunken PCC88's, and those tubes last. My amp was modified by Carlo, and is better sounding than the stock version. Even considering the mod cost, you'd have to spend a lot to get an amp that could match the sound, much less better it. Even in its stock form, the SHA-1 at its going rate is a steal compared to some of the crap out there.
A rep can develop when someone listens to an amp with crap tubes and then makes conclusions about the amp without even realizing that he's never really heard what it should sound like.
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My (actual) highlight of the meet was the funky tube amp with the funky tubes.
Mine also. My first impression was that it may have been one of the best K-1000 amps I've heard (and that Pete really needed a better source).
I've got some pictures from my cell phone. Will try to upload them at some point when I get a minute and post them here and at the other place.
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Big cats like big boxes...
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The headphone jack on the MicroZOTL was an afterthought. It reportedly came about when Berning was discussing the ZOTL with reviewer Dick Olsher, who suggested the idea. The ZOTL was originally conceived to be a 2WPC speaker amp for office use. It was also designed to show that Berning's zero-hysteresis OTL technology could be implemented in a relatively low cost design. There were no transformers in the amp (not even the power supply, which was a switching type). That accidental headphone jack probably sold more ZOTL's than the original concept. The MicroZOTL was my reference amp for a long time back in the day.
As a headphone amp, the bass on the ZOTL was never completely convincing, but the mids and highs were superb. Berning is a talented designer, and if he went about designing a headphone amp for that purpose without cutting corners, I for one would really be interested in hearing the result.
A speaker amp modified for headphone use is likelier to be better with low impedance headphones. Remember that speaker amps are designed for loads around 4 to 16 ohms. A "low" impedance headphone is normally around 32 ohms, so would already be at the high end of the impedance range for which the amp was designed. A high impedance headphone (300 to 600 ohms) would not be the type of load for which a speaker amp is built. The designer would be the best judge of how the circuit would be affected by load. Since it doesn't exist yet, nobody can actually have heard it.
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The 747 is a farily reliable tester, and one that I use regularly. However, it's got some issues. First, there are almost certainly some inaccuracies in the setup manual (endemic to all testers). Second, the tester needs to be calibrated. Instructions are in the manual, but it's a pain in the butt to do it. If your tester is stable for long periods of time, it need not be done often. I keep a set of known tubes just to test periodically. As long as I get the same readings at different times, I'm fairly confident that calibration hasn't drifted. If you do get consistent drift over time, then an overhaul of the tester is probably in order. Finally, there were changes in tube production over the years. Some tube types changed radically. I've had NOS tubes test near 100 for some vintages, and the same type from a different brand/year test at 10%. I also use a Heathkit TT-1A, which can often get accurate readings on tubes that the B&K has trouble with.
Finally, a low reading on the tester does not necessarily mean that a tube is not NOS. Some tubes simply read lower than others. Many will never get near 100 on the 747's scale. If you believe that a tube is NOS, try doing a life-test. The life-test reduces filament voltage by 10%, but also provides a compensating signal boost. A tube is considered "good" if the actual drop in signal is less than 25%. However, NOS tubes can be insensitive to the small drop in voltage (tubes become more sensitive to this with wear). What you might see then is an actual increase in gm when you do the lift test. If you see this increase in gm, or at least no drop, when you perform the life test, the tube is probably near NOS at least, regardless of the actual gm.
You can do this with a larger voltage drop by reducing the filament voltage manually. If you test a 6v tube at 5v, and the results are still fairly consistent (only a minor drop at worst), the tube is likely very strong, again regardless of actual gm.
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Got BDP-83SE back from Oppo yesterday. First impression is based on movie watching only, but FWIW this thing sounds good. Clean precise imaging, very fast and detailed, strong low-end performance. Great value for $300 on top of the original player cost... and that's before the burn-in.
(Using 7.1 channel analog output into Outlaw 990. In comparison, digital input to 990...sucks)
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getting old sucks big time
The alternative sucks much more.
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HE90 > HE60 > the rest of them
I listened to the HD800 on a bunch of amps, but for some reason it kept sounding like an HD800 which wasn't a sound I particularly liked. There may be a magical amp out there that transforms it (a friend on mine likes it with the Luxman P-1, although I didn't think it was that great a combo). I just never really enjoyed listening to the headphone.
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And if it's underpowered, it's going to show a different frequency response -- extreme example would be the RSA Raptor trying to drive a low impedance headphone vs. a high impedance headphone -- it's not just the amplitude that falters, the whole frequency response goes down the crapper, no matter how much you turn it up. That's not just distortion. That's impedance mismatch between amp and headphones.
If they're acting like resistors, then they're going to increase the effective impedance. LRC circuit theory sez that that will change the frequency response based on the amp. Do you remember what amp you did this comparison on? Was it the MicroZOTL?
MicroZOTL, SHA-1, HP-4, Supra and whatever other amps came through. Every amp I ever used to compare HP-1 to HP-2 required significantly more gain on HP-1 to volume-match to HP-2.
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Wouldn't that depend on the amp?
No. Less efficiency means that any amp has to put out more power to drive it.
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I think the difference is largely psychological -- you know there's those switches in the signal path on the ones that aren't on the twos, so you want to hear a difference, but I don't know if it's actually there.
The HP-1 was a less efficient headphone than the HP-2 when I had both. The switches are theoretically the only difference, which would have meant that they were acting as resistors in the HP-1. While a good switch may only produce psychological differences, a switch that affects gain in either position is producing physical differences. It's also possible that not all HP-1000 drivers were created equal, although I subsequently heard the same difference in efficiency on other HP-1/HP-2 comparisons. The high-bandwidth reference cable made a difference also, and had more extended highs than the older Laboratory Standard cable. My memory is that the HP-2 with high-bandwidth reference cable was the best of the HP-1000 series.
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Took a look at it, but decided that the Pipolino might not be the best idea for canned cat food...
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Mikhail had the tubes in another small business area (like the original spot he worked out of) he had rented, a short drive from there. Thats where my wife saw them on one of here trips to Denver. Not sure where he keeps them now.
Long since gone from there. He put together a pre-fab storage building on his property in Byers, shortly after he moved his plant. They were at the Byers facility, at least until he broke off contact.
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i'm thinking that hirsch means 7044's
no such thing as a 6044. Unless that's a mikhail private label
You're right, my typo.
That was my ace-in-the-hole when Hirsch replied back and said he had indeed seen them and got all pissy and defensive..If that's what you consider an ace-in-the-hole, I really want to play poker with you.
I originally found the tubes, and put Mikhail in touch with the seller. I also helped pack the trucks. So yes, I've seen them, handled them, and personally packed the 7044's, but don't feel particularly pissy and defensive about it. Wish I had kept a bunch of them for myself, though.
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Modwright makes preamps that use 5687 tubes.
Don't bother Kevin with facts. He's on a roll. I won't even mention the 20,000 or so 6044's. Manley Labs uses them, but what would they know about audio?
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I think it is well known by now that more than half of mikhails monster
tube collection is bad tubes, and the other half is stupid stuff he
will never sell.
Much that is "well known" can also be false. Mikhail's problem with tubes was that he was too lazy to test them before sending. However, you're seriously underestimating what he has, which is too bad since the value in those tubes represents the best chance for people to recoup money from him when they catch up to him. They also represent a way to find him, since there's a lot of them, and they need to be stored and sold.
Think two 53-foot semis loaded top to bottom with tubes representing the remaining stock of an electronics warehouse after the death of the owner. Hundreds of boxes of mini-tubes. There could be as many five to ten million tubes in total. One tube dealer told me that he thought that the purchase made Mikhail one of the largest tube suppliers in the US in one deal.
Those tubes should have given Mikhail a competitive edge over just about everyone else building tube amps, as he got them for almost nothing, giving him a lower parts cost than anyone who had to go out and buy tubes for their products. Stupidity doesn't even begin to describe it.
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