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tube fanatic

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About tube fanatic

  • Rank
    tube amp designer

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  • Interests
    extracting the best possible sound from single ended tube amps using modestly priced designs and tubes.
  • My System
    Now specializing in extreme near-field desk top systems using flea power SEPs and SETs. This mode of listening must be experienced as it can be totally enveloping.

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  1. I’m surprised that no one has brought up glyphosate, dicamba, paraquat, 2, 4- D, forced vaccination, water fluoridation, acetone/ benzene and other toxic chemicals in dryer sheets, and other chemical horrors which have been banned in many other countries. It seems that the more this stuff is banned elsewhere the more EPA raises the “safe” limits here. Maynard
  2. My wife, who has become quite a techie over the years, has been thoroughly enjoying this thread! She is amazed that Jeff is going to spend more on his 4 Dynamicaps at $66 each than the entire parts cost of one of my budget designs! She also couldn’t imagine spending $50 for a single tube socket which she doesn’t believe could work any better than the NOS Cinch sockets that I normally use. And, I can’t repeat what she said about cable tie colors affecting the sound...... This is what makes the hobby so much fun. Maynard
  3. I understand the confusion about Jeff's statement and, frankly, it floored me a bit as well. It is impossible to compare a 600 watt SS amp's distortion and noise characteristics at only 250 milliwatts out with that of a flea power tube amp which is maxing out at such a power level. And, there's also the issue of amplifier output impedance which is in series with the speaker impedance thereby affecting the amount of power the speaker "sees." There's too much disparity between the amplifiers to make any useful comparison in my opinion. I'm a bit confused by the ground bus statements about the tube cathodes. Given the very tiny diameter of the tube's cathode pin, and even tinier diameter of the internal connections, it seems a bit of a stretch that an extremely short, thick, external lead could matter at all (especially since the DC plate current change between the quiescent condition and 250 mw output is probably not more than 1 ma). Jeff, if you can explain the science behind this I will certainly try to process it. Maynard
  4. Lots of information is needed- room size, room furnishings, listening level, types of music, distance from speakers when listening, placement of speakers, and other factors. There is no best tube or amplifier type. About the only thing which can be recommended logically is the amount of power you may need. That will help determine some tube types which may be suitable. Beyond that, you’ll need to try some amps in your system to find what is most pleasing to your ears. Maynard
  5. Max, this thread should be moved to the Talkin’ Tubes section of the forum as it will only get lost if it remains here. Please ask the moderators to move it over there where it will have much greater activity. Maynard
  6. tube fanatic

    45 amps

    In my world 2 watts starts to approach high power territory. And, you would be amazed at the sound of a flea power SEP with Klipsch speakers. As I mentioned in your other thread, your Heresys on the desktop need such minuscule power that even 1 watt would give you as much headroom as you need. Maynard
  7. Synergy between an amp and the speakers is critical. In the design world we always start at the speakers and work backwards. For whatever reason, the combo of the Mac with the K-horns works for you. It has nothing to do with power as you have determined. Besides, 75 wpc is more than enough to satisfy all but the most extreme listening levels. Enjoy it! Maynard
  8. If the restoration was competently performed, and all the original solder connections were verified to be intact, the amp should be quite reliable. The phono stage is not anything special (in my opinion) but performs well and is comparable to that of other amps of similar generation and price point. All amps have quirks of some kind or another. Don't worry about it. They are easy to work on by a skilled technician, but are definitely not a beginner's project. The voltages encountered under the chassis can kill you! Hope this helps out a bit.... Maynard
  9. What do you want to know? Maynard
  10. Yes, it is a fine idea. By reducing the number of rotations of the control its life span will be extended. Many guys use the switch on the surge protector to turn all their equipment on/off. Maynard
  11. Jeff, how much peak current do you expect the KT88 to need? Maynard
  12. Why do you consider GTO bypasses so wonderful in an audio application? Is it purely subjective, or is there a scientific explanation? Those following the build may be curious. Maynard
  13. The pics and labeling are terrific and are reminiscent of some of the electronics magazines from back in the day. Maynard
  14. Jeff, what is the purpose of removing the flux from the solder connections? Other than cosmetics, I have always believed that it is not necessary unless used on printed circuit boards which will have elevated temperatures in the 200+ deg. F range. For hard wired audio amps, such a temperature under the chassis is very unlikely (I sincerely hope so anyway!). Just wondering....... Maynard
  15. Jeff, as you know, there's a heated discussion about your build on AA in which Dennis made some assertions yesterday which made the little remaining hair on my head start to fall out! He asserted that published tube data is all wrong since it doesn't account for thermal stresses within the tubes, and that his simplistic method of generating plate curves (using a variable B supply and some batteries) provides the only correct data. My traditionally trained brain just can't accept this. Since you are using Dennis' parameters in this build, I thought it fair to ask you to please post his plate curves along with a detailed explanation of how he knows what is going on inside the tube thermally, what corrections he has made to allow for this, and why he does so. I can't imagine that he has a sufficient background in electronics, metallurgy, physics, etc. to justify his claims (his statement about the 75TL really got me- Eitel and McCullough should have hired him to do all of their engineering when they had the chance!). Those who want to know a bit more about this very involved topic may enjoy this article: https://www.john-a-harper.com/tubes201/ Is there any chance you can convince Dennis to sign on here to explain all of this? I'm willing to consider his points of view if he can back them up with some proof. Maynard
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