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"The ear is a funny thing" very true but we do not hear with our ears we hear with our brains and are therefore subject to all the follies of the mind IE we tell ourselves what we want believe and we

OOOhhhh, this has been the cause of some VERY hot debates on the audio newsgroups. I certainly won't get into it here. I would LOVE to be the participant of a double blind, being the engineer at

Dean, not to get into a big debate here, but there are lots of things going on that test gear cannot measure. I agree with you, as I am an engineer, and I say "speak with data". But, I've listened

I am with Dean on this one. There is a special process called "double-blind testing" where these sorts of claims can be debunked. If I understand it right, double-blind testing amounts to the

Methinks the tops of my boots are needing a few more inches to clear the effluent which is building. Ain't no way the human sense of hearing has the bandwidth or the dynamic range that even modest

Excuse my ignorance, but what is so special about the 12AX7s compared to any of the other twin triodes?. I have been swaping them around for years in various pieces of equipment without much

europachris@... writes: . tubes I have never read about this in the electronics literature, but look up the phenomenon of "superwaves" in the field of oceanography. In perfectly normal

Ahhh, a topic that I'm well versed in. I'm an "audio nut", but am totally not into $100 cable, stones, magic dots, etc. I'm into the DIY tubes and speakers end of it. While there IS a lot of hype,

The vacuum tube audio guys have gone absolutely "stupid" over this sort of thing. This is the same group that will pay $100 per foot for special oxygen-free speaker cable, $50 for special medical

Just a note to those who may have some 12AX7s in their equipment (e.g., 549 has 2) or junk box: Check your stuff for Telefunken tubes. There are some strange people out there who pay big bucks

I hate to disagree, but the Navy Chief had a good point. The military, as you know, tends to "go by the book". The book in this case is a Tek manual and it specifies timemark generators. But more

Sometimes, time-mark generators are overrated. The advantage of them is that they make vertical marks for easily matching marks to graticule lines. But if you need faster timing checks, you don't

In most sampling instruments I have encountered, signals start distorting when they exceed about 2 volts in amplitude. Damage to the sampling diodes occurs around 5 volts and you never want to apply

Hi, I haven't had any experience with sampling CROs but believe the plugins can be damaged with input signals greater than 5 to 10 volts (depending on model). Be careful to limit input signals as

And don't forget those batteries in the sampling diode bias. I personally think that the S14 is a washout. You can only go to 1 GHz with it and with a 79xx you can already get to 500 MHz. So, why go

Hi Shiran, No, the trace traveling from right to left is not normal. The first suggestion that I have is for you to take off the cabinet and take a look at the CRT neck pins, about halfway from the

Hi, I am a student and I got my Tek 465B from an eBay auction. I know how to use the oscilloscopes, but have no experience in idendifying and fixing problems in oscilloscopes. The problem is that,

Sorry John but I don't have access to this thing. It's owned by someone several hundred miles from here. I think he intends to keep it and restore it. But I've asked him to let me know if he

Sorry I can't help you with that, but if you have access to 517 power supply parts, I think it contains a tube I'm looking for as well -- the Sorensen 2AS-15 "special diode". I also have use for one

I would if I knew what the thing fed. I've asked the person who asked me for the same info (ie where is the transformer and what does it supply). I believe there is a separate fil transformer in the