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In Reply to: RE: Why integrated?....or must it be integrated? posted by Russ57 on January 26, 2015 at 15:48:49
Sorry, given your comments, I could not resist using the punch line from a joke I used to tell in junior high school. I'd did work on tube amps when the best you could buy was REL Muticaps and metal film resistors, so I don't have any experience with a lot of boutique parts, but what you say about the prominence of good circuit design makes a lot of sense to me. You can't polish a tu...
I have read about CCS loading and it make a lot of sense to me. Are the modern manufactures using it?
I guess the EL34 is the tube that is the transition between the hard and the easy to drive tubes. It works well with a split-load phase splitter (Dynaco Stereo 70) and a long tailed pair (Marantz 8B), however, you could argue that the Marantz is the better sounding amp.
Dave
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Not aware of any modern mainstream commerical amps using CCS's. Can't say I keep up anymore honesty. Bottlehead has long been using them though.
The EL34 is pretty easy to drive as a pentode, little more difficult in ultra-linear, and much more difficult when triode strapped.
The dynaco vs marantz is a prime example of a cheap circuit design compared to a superior one. Dynaco has good output transformers. All the rest isn't so good....although the idea of using a pentode as a voltage amp has merit. Assuming we are talking the same marantz....there you can see some excellent engineering on the values chosen for the feedback loop.
Rel was a bit of an audiophool name. Think more about material/type of construction. A good name brand polyproplene and tin foil wrapped cap is plenty good enough. Truth be told, most audiophool brands don't make the caps they sell. Back in the day F-dyne was one of my best value caps. 716b orange drops and vitamin q caps rounded out my aresenal.
I work maintenance at a hospital. I get to see what the best cutting edge medical devices use as well as things like diesel generators. After 30+ years I have a good idea of what performs well and lasts. Take my word for it, 99% of the names mentioned for audio caps/resistors would never be seen in such equipment.
Today the average joe can afford test equipment only the richest company could a couple/few decades ago. It really is an age of oppertunity for the diyer. You just have to invest in the education to know how to use them.
Triode strapped is what I preferred when I had tubes, but I don't listen to music very loud. I don't think you'd get much argument about the Dynaco Stereo 70 versus Marantz 8B. Many consider the Marantz to be the pinnacle of vintage amps. The stock Dynaco was not perfect, but good results could be had if you are willing to mess with it. I ran Mark IV's for a while and enjoyed them very much. Of course there is better out there.
I was under the impression that the 6BH6 pentode driver tube in the 8/8B was wired in triode. I would love to build an Marantz 8/8B copy some day. I'll never be able to afford the original, and the reissue is also out of my price range.
Dave
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