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  1. PRR

    John McKnight, a giant of magnetic recording

    From Richard Hess' website, 2022 Christmas Letter (link) QUOTED from https://www.richardhess.com/family/christmas2022.pdf
  2. PRR

    Something to lighten the mood

    This may not be mood lightening..... Home skills every girl should be taught: 1. How to change the locks. 2. How to disguise the taste of arsenic. 3. What a restraining order is. 4. How to disable an attacker. Teach your daughters well.
  3. PRR

    What is the best way to measure transformer output?

    If you match the weight the regulation will usually be fine. If you over-size, then like the hotrodder dropping a Hellcat engine into a Mini-- you better know what you are doing.
  4. PRR

    Glassware PS Tube HELP

    It is a peak-catching rectifier and a sine voltage. The peak of 270V is 270V*1.414 or 382V. That is a 56VA core and I would expect 10% sag, or 10% rise no-load. Do you possibly have 117V walls at your house? Then 270V*1.414*1.10 is 420V. QED (This would be 449V in my 125V house.) WITH...
  5. PRR

    Something to lighten the mood

    This graveyard looks overcrowded. People must be dying to get in there!
  6. PRR

    Something to lighten the mood

    My uncle named his dogs Rolex and Timex. They're his watch dogs! ------------------ I named my dog "10 miles". So, when people ask me what I'm doing at the moment, I just say: "Here I am, walking 10 miles"...
  7. PRR

    Posting

    Stuff like that may be very specific to your machine setup. Which "Samsung phone"? What version of Android? (maybe Settings, System, About Phone, Software version) What browser? Chrome is the usual default, but yours may be Samsung-modified. Or you may have installed Firefox or Opera? What...
  8. PRR

    Randall Satan/Thrasher 50 Clean Channel Problem (LND150)

    That's not even a little "messy", for a tube guitar amp (or Silicon approximation). The signal is still stronger than the distortion. As long as you can get "less" (and later you say you can) then that is not a problem. Wish I knew how you are blowing those FETs. Are they open in the gate...
  9. PRR

    13W*2 6P14/EL84 from ebay

    The format @Username will create an Alert to the indicated member. Even if you don't have private conversation permission yet. For example: @Malcom Mal Reynolds
  10. PRR

    Subwoofer Active Filter Help?

    Ah, that drawing is mis-labeled. The 2nd opamp is a unity-gain Sallen-Key high-pass. I do not know why it says "buffer". As you point out, there's about no reason to buffer between the first opamp and a short cable.
  11. PRR

    slowwww

    For anybody who has trouble finding the link: https://www.diyaudio.com/community/account/upgrades/
  12. PRR

    Why classic shorts test doesn't kill some tubes?

    Most junctions can touch breakdown if no current flows. Even very small current may be OK. But usually when we break-down a junction, 'infinite' current tries to flow. This is bad. As Depanatoru said, the shorts Neon invariably has a resistor or other impedance. Indeed if it didn't, the...
  13. PRR

    Choke vs inductor

    1946: https://maritime.org/doc/radio/chap10.php "The subject of this chapter has two names-CONDENSER and CAPACITOR-and both names are OK. A lot of hot arguments go on over which is the correct name. Some men argue, and probably rightly so, that the name CONDENSER is wrong, since NOTHING is...
  14. PRR

    Help understanding cathode bypass capacitor

    This is a mostly fix-bias amp. The 15.6 Ohms in the big Dynaco is not enough to matter. The Gm of EL34 at this current is about 8 mA/V. So the internal cathode resistance will be 1/8 mA/V or about 125 Ohms. Another 15 Ohms of resistance is very little difference. The Philips datasheet, under...
  15. PRR

    Subwoofer Active Filter Help?

    Do the filtering in a separate op-amp.
  16. PRR

    1 XLR to replace Stereo phono

    Yes, 300 feet from a low line level source. Multiple venues. Had trouble one place with an old elevator, also when the security-guard's 10-pound walkie-talkie was transmitting. Much better than dual 1/4" because better grounding.
  17. PRR

    Bazz Fuss

    You are in the wrong place. A Bazz Fuss is blasphemous to most audio people. You want a guitar pedal forum. https://www.freestompboxes.org/ https://www.diystompboxes.com/smfforum/index.php https://www.diystompboxes.com/smfforum/index.php?topic=130195.msg1261974#msg1261974 I have the dim...
  18. PRR

    Replacement of Spring-Clip Speaker Terminal

    "Continuity" is for trailer-light mechanics. VERY simple systems. Electronics technicians can read numbers. How many ohms do you see?
  19. PRR

    Something to lighten the mood

    Sperm bank explosion is apparently a real thing. Bull sperm is stored in large quantity to inseminate dairy cows to keep the milk flowing. It is stored in liquid nitrogen, in tin buildings in cattle country, by cattlemen. Sometimes the heat, or a fire, makes the nitrogen canisters burst. The...
  20. PRR

    slowwww

    (y) (However "Imported Smilies" are broken, if we care.)
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