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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. Mixing brands is fine. With intermittent tube problems it is easier to replace the suspect than to try to figure out what is going on. A tube tester rarely picks up such issues. With push-pull stages I recommend replacing the pair and buying from a seller who can match them using a curve tracer. Maynard
  2. Zen, are you saying that the American Academy of Ophthalmology is spreading disinformation? I sincerely hope not. If you believe that a general practitioner knows as much about ocular conditions as an ophthalmologist then I wish you luck! Maynard
  3. Well, if a person who has had corneal grafts develops symptoms and sees their family doc who is clueless and loses their sight as a result I imagine they will be more depressed! Knowing the possibility would likely result in their seeing an ophthalmologist instead and saving their eyes. Maynard
  4. Beautiful work George! A forum member in Tennessee is looking for someone to build him an amp. PM me if you are interested and I will get you in touch. Maynard
  5. tube fanatic

    Old eyes

    Wearing glasses cannot cause them to get weaker faster. The brain can get accustomed to the level of clarity which glasses or contact lenses allow. If you try to take that away after a length of time a person can feel “blind” although nothing has changed. This is seen across all age groups and with correction for myopia, hyperopia, and astigmatism. Maynard
  6. tube fanatic

    Old eyes

    This is not correct. Failing to wear corrective lenses will not cause eyes to change more rapidly. Maynard
  7. Before considering ordering a single ended amp it is worth measuring how much power you will need to satisfy your loudest listening levels. When the time comes I can point you to a very simple method which takes about 2 minutes using a cheap multimeter. Do post your impressions after the tube swap. Maynard
  8. Well, I have never found that tube rolling produces significant changes in sound although others may disagree. As far as single ended amps go, they are the only type I design and use. I find that SEPs and SETs offer a “magic” which I don’t experience with push-pull types. If your listening levels allow the use of low power amps, then they may be the route to the kind of sound you are looking for. How far from the speakers do you sit and how large is your room? What type of music do you listen to? Maynard
  9. Before you consider other amps I need to ask some questions. Have you tried both impedance taps? In some systems one tap can provide a very different sound from the other. With a different amp is the sound radically different? And, does the LM-34 sound well with different speakers? Another option to try, which is not costly, is to try swamping resistors to smooth out the speaker impedance variations: https://www.zuaudio.com/diy/loading25r Maynard
  10. The forum has a section devoted exclusively to the use of tube electronics (Talkin’ Tubes) with Klipsch speakers. If you post your question there, and read through the posts, you will get lots of information to help you make a decision. Maynard
  11. (Mod edit: personal commentary removed), If you have had a corneal transplant, know someone who has had a transplant, or is going to have one, this information is relevant. https://www.aao.org/editors-choice/two-cases-of-corneal-transplant-rejection-after-co No discussion please as the thread will probably be locked immediately if there is. (Mod edit: Author's conclusion: Clinical significance This study is the first evidence of a temporal association between corneal transplant rejection after COVID-19 mRNA vaccination and the first case reports of DMEK rejection following any immunization. Patients need to be informed of the symptoms and signs of rejection that require immediate medical attention. Clinicians and patients should be aware of this potential risk and consider vaccination before planned nonurgent keratoplasties. In those who already have corneal transplants, it may be beneficial to either increase the frequency of existing steroid regimens or avoid reducing treatment around the time of vaccination. When patients present with signs of transplant rejection, physicians should inquire about a history of vaccination and report temporal associations to the relevant agencies. As both patients were successfully treated with topical corticosteroids, the findings in this paper should not deter administration of the COVID-19 vaccination, because early recognition and prompt treatment of rejection can yield positive outcomes) Maynard
  12. The easiest solution is to use the second 50L6 (or any other 50V/0.15A) tube as a filament ballast so you can leave R15 as specified to reduce under chassis heat. With only one channel, plate and filament voltages will run a little higher since the p/s won’t be loaded down as much, but it will be ok. If you happen to have an 820 ohm/10 watt resistor you can use that in place of R13/14. Feel free to PM with other questions. It may take me a few days to respond though. I now use full time, single speaker, mono with a RB-51 series 2 near a room corner and the combination is pure bliss to my ears. Maynard
  13. Many details would be useful: room size, listening level, distance from speakers when listening, type of music, and lots more. I have set guys up with ridiculously low powered amps which practically blew them out of the room. Your budget opens up many options like the Decware Zen Triode. It provides more than enough power for any “reasonable” listening level in my opinion. The lifetime guarantee is very appealing as is its being built in the US. If you are electronically experienced, and can build your own, I can provide you with a link to my most successful SET design which works great with LaScalas. Maynard
  14. The question is what constitutes a better power supply for SETs. If the ripple is sufficiently low to prevent any hum, all is well. The DC current draw is almost constant in SETs, so regulation is often unimportant. Of greatest importance is choosing an operating point which promotes the best linearity so distortion remains very low. Maynard
  15. Forgive me for asking, but isn’t the above discussion political? If not, can we have a discussion about the movement to end abortions in this country while funding them elsewhere? Maynard
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