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tube fanatic

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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. Tough question to answer without having a great deal of additional info! It could be like comparing apples to oranges……. Maynard
  2. Captain, at your age I would expect your hearing capabilities to greatly exceed mine and Henry’s. Any time you want to trade let me know! I’d gladly turn the clock back 30 years 😀! Maynard
  3. The Hammond 125SE series transformers are capable of outstanding bandwidth and specs when used well below their rated power. As Henry said, one can always spend more. We have all seen the ad nauseam discussions about beeswax filled capacitors, etc. George Anderson ran measurements on the Hammond 125CSE which clearly show just how excellent a budget unit can be if used appropriately. http://tubelab.com/articles/component-testing/budget-output-transformers/ Maynard
  4. At this point I can only say that this is Henry’s thread and he can decide how technical he wants it to be. I believe that most participants are more interested in learning about equipment which complements their Klipsch speakers than knowing why. If I am wrong, then start a thread on tube amplifier design and I will try to be involved as time permits. Forum members, please post your thoughts on whether you want to learn about tube amp design and Henry and the moderators can make the appropriate decision about continuing the discussions here. Maynard
  5. Sorry Cap, but your arguments are only partially correct. But, this is not the venue for such a technical discussion. If I can find time during the week between Christmas and New Year, I will start a thread on DIY Audio and discuss it with you there, where it belongs (I assume you are still very active on there as well). We can post a representative amplifier and analyze every factor from input to output and look at what happens everywhere. Then, we can have the input of other EEs to really spice things up a bit! Maynard
  6. Captain, did you measure any phase shift in your breadboarded Sweetie with fb? Some listeners seem to be able to hear it with certain music so I side with Henry in not using any with SETs. As far as simple vs. complex music goes, I like to use large choral works to make some evaluations. In years past I compared the tube amps with SS units having virtually no distortion (but large amounts of nfb of course) and heard little or no difference on such selections. Congested sounding vocals were still that way with the SS amps. At this point my conclusion is that it really doesn’t matter how the amp measures if the listener doesn’t like the sound. So called “accurate” reproduction is not always the most pleasing to listen to. There’s a reason why so many use the tone controls on vintage amps and preamps so liberally. Maynard
  7. I am definitely in Fido’s realm with listening levels. Years ago we had a discussion on here about what I termed the “magic listening level” at which the room contributed little and at which music just seemed right. I recall that the consensus was that lower levels were considered best. I have always contrasted my habits with those of “the guy down the road” whom I have spoken of many times. His usual level is in the 110-115 db range from his CWs. He is a professional drummer (and retired music teacher). Amazingly, he isn’t deaf. The flea power folks I designed amps for all preferred small room, near field, systems and low listening levels as a means of being drawn into the music. Maynard
  8. My wife makes me watch this whenever I get into a crabby mood (as all can imagine, this rarely happens 😄): https://youtu.be/ZbZSe6N_BXs Maynard
  9. I am concerned that you found high distortion from the Sweetie. At 250mw it should be very low. Can you take measurements at the 6Y6 grid so we can see what the driver is doing? If that measures high, try pulling its cathode bypass cap to get some current feedback and measure again. It will drop the gain, but the 6SJ7 has so much it should not be an issue at all. Also, if your signal generator can provide output of a solid few volts rms, you can try driving the 6Y6 grid directly and take that measurement as well. Maynard
  10. I can’t get enough of Dailey & Vincent. They play faster than I can think, especially Jeff Parker on the mandolin: https://www.youtube.com/watch?v=KshIfJSqcHU Maynard
  11. I recently read an interesting article about the carnivore diet. Can you describe your typical daily meals? Are you eating cafo meat and, if so, do you have any concerns about all the antibiotics and hormones you are ingesting? Maynard
  12. Close Mark- November ‘58! Maynard
  13. I may have to try something like this! Maynard
  14. Aside from having an extra tube filament to enjoy looking at I don’t see any need to add the expense of another tube which will eventually need replacement, and another socket. Modern SS diodes can typically handle a 100-200 amp surge so that is a non-issue, and I find that the power xfmr impedance is sufficiently high to serve as a peak current limiter. I have never had a power xfmr fail due to peak current issues. The component which takes the hit is the fuse and often needs to be a slow blow type. Another advantage of SS rectifiers is that they allow the use of very large value input filter caps so that ripple can be brought down to negligible levels very inexpensively. Two caps and a resistor can create ripple values which can only be duplicated by using a more costly choke with a tube rectifier (the value of the input filter cap is generally very low to protect the tube). When designing new equipment it comes down to a matter of taste.
  15. Can you find out who did the servicing and exactly what was done? Owning vintage gear can be costly if critical components were not replaced resulting in failure. Maynard
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