Vinyl Asylum

RE: More measurements

24.27.41.140

Triode_Kingdom

In Reply to: RE: More measurements posted by 1973shovel on July 02, 2024 at 16:35:16

"an old post on the DIY Tube Asylum which said that they need at least 10 VDC on them to 'work'."

I probably have less experience with Teflons than you, but I'm highly skeptical. Was any scientific data presented in support of this claim?

Follow Ups:

"Was any scientific data presented in support of this claim?" - 1973shovel 03:56:27 07/03/24 (1)
No, there wasn't, not that I saw. But the poster really seemed to know quite a bit about many of the Russian cap types, including details regarding their internal construction. You even left him a "Great info, thanks!" comment. (link below)
Here's the statement in question: "Foils are connected to tabs or wires by thicker aluminum strips; these strips are riveted to tabs, but not welded or soldered to foils. For this reason, FT caps may not perform well at very low voltages, and, if used as coupling capacitors at low signal levels, need at least 10V of DC bias."
My curiosity in this matter involves feedback in a tube amplifier circuit, rather than anything directly to do with 'vinyl' (although it does also apply to Teflon RIAA capacitors). So after Independence Day has passed, I'll start a new thread on the subject over on Tube DIY. That way it won't add to off topic clutter here, and may increase the likelihood that other builders may see it.
As always, thanks TK!
- Russian Teflon Capacitors (Open in New Window)
Edits: 07/03/24
- RE: "Was any scientific data presented in support of this claim?" - Triode_Kingdom 08:09:22 07/03/24 (0)
  Thanks for the link. That wasn't a reference to anything inherently wrong with Teflon dielectric for our use. He was referring to the riveted construction. I remember reading that post and thinking it would be wise to avoid those particular caps, regardless of the circuit.
  
  Have a great 4th!

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