A study by the Technical division of VOA - Techniques-to-Extend-the-Service-Life-of-High-Power-Vacuum-Tubes.pdf... It's said a few per cent under filament voltage spec will extend the tube life. A few percent over spec greatly reduces it.
My Quad Electrostat did glow.
I had aan OTL output transformerless design from Krihn-Hite. It was designed to give 200V in 200ohms . . .
And it sounded great on the ESL57 - untill I dropped the PU needle and I saw the arcs in the speakers . It took some time for them to slowly restore (the edges of the holes burn away or evaporate).
I had aan OTL output transformerless design from Krihn-Hite. It was designed to give 200V in 200ohms . . .
And it sounded great on the ESL57 - untill I dropped the PU needle and I saw the arcs in the speakers . It took some time for them to slowly restore (the edges of the holes burn away or evaporate).
IMHO: unlikely to be electrostatic. Balanced Armature more likely. Especially if the cone has a small rod glued in the center.
BA drivers have become "obsolete" with the declining cost of electronic amplification, but I am listening to one now.
Yes. You are correct it appears. I have not really studied on this radio model yet, so many other projects going on. House remodelling in progress, ect. One of these days though, I will get to it.
That moment you realize either you're beating the crap out of that 12AU7, or it's failing...
A cheap Chinese replacement (EDIT: PSVane isn't cheap apparently) does the trick and doesn't glow like this. It's in a regulator.
A cheap Chinese replacement (EDIT: PSVane isn't cheap apparently) does the trick and doesn't glow like this. It's in a regulator.
Attachments
Last edited:
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
- Home
- Amplifiers
- Tubes / Valves
- tubes with the best 'glow'