> grounding? -what do you do? Ignore it until it becomes a problem. Audio amps don't "need" a ground to "work", any more than a flashlight does. For simplicity, we use "single ended" signals where everything is referred to a common bus (traditionally the metal chassis of a tube...

> How do I apply shielding Don't need no shielding. Especially with 550 ohm impedance. Unless you are sitting on power transformers or under a radio tower. You have a lot of basic questions. Look: get a cheap cable, some cheap resistors, and some duct tape, and just do it. You will...

> Twisting the conductors greatly reduces capacitance and inductance in the cable. Uh, he's a bit confused. Twisted pair has more capacitance. Open-wire pair (think of antique telegraph poles) has less capacitance. Twisting pairs affects inductance, but I'd rather not go there...

> about your friend...I hope things work out Thanks. He looks good today, but will go under the knife in the morning to find out what is really wrong and hopefully cure it. IMHO things look good, but it will be an "interesting" day. Cross-posted from HeadWize DIY: "Opamp to Source...

> Nuvistors... and the development of "compactrons" were last ditch efforts to forestall the obsolescence of the vacuum valve industry. To that list, add the power tubes 7189, 7591 and 8417. Nuvistors are the old acorn tubes with transistor-like packages. But the movement started before...

> they are type 1 tapes with the ferrite ground fine enough to meet the type 2 standard. they are not true type 2 formulation. You clearly know your type II tapes more than I do. I picked a tape that seemed good, made the machines work with it, and rarely pushed the limits. Even big-band jazz...

> the meter, the DoubleD sign is marked at +3db VERY odd. I do recall that Yamaha sometimes did things differently. But this quirk does not ring a bell. The Dolby Level was a good maximum for 1980 tape. Tapes got better and "0VU" slid up to +2VU or so (i.e., Dolby Level at -2VU). DD at...

> ...good cassette recording, you basically get back what was on the source > With MD it sounds like everything was taken apart and put back together again with slightly smaller "parts". That's one way to put it. Analog comes back dirty and bent, like when you loan your new car to...

> I say 14vdc in the post, but the specs I list actually say 14vac... Arg. That can make BIG difference. And I'm kicking myself for not reading every line and getting specs myself. (Actually... you edited the post while I was composing a reply... rather startled me to see a different message...

> Wow--this amp sounds... BoyElroy: this little plan has also come up on HeadWize forums, and Chu Moy may add it to his collection of articles. Obviously you are the world's leading expert on this plan (being the only one to have built it). May we quote some of your comments on it? Do...

> the md has much less noise and overall harmonic distortion, Very true. > any digital artifacting was not audible to me..; however, the md version had a slight veil over the music, and seemed frequency compressed at the extremes. ...a wider stereo image with better instrument placement...

> do I have to adjust the rec level for diff. kinds of tapes that I have (like diff. brands or diff. types for that matter)? My advice: pick one tape brand/model and stick with it. But mostly, the same Type tape from different high-quality makers will give "similar" performance. There are...

> Stupid Ques There are no Stupid Questions. > no bias knob, so is that bad? No. That was typical until you got up in the $400 range (and in those days, $400 was a lot of money). And even when there was a Bias adjustment, flattest response with any good standard brand tape was...

> output impedance is not 7K ! I can't readily find a schematic for the OTL connection. So my remarks may be quite wrong. Looking at this diagram, and assuming that the OTL jack is capacitor coupled to the plate of the output tube: The 6BQ5 is triode connected, and running at 131...

> PRR: Thanks for redoing rain's list to include Recent cans. Well, but I didn't add anything to Rane's list. I did shorten some model numbers to fit.... if by accident they now look like new-models, it should be understood that they come from Rane's list. I can't find info on modern cans...