Tube DIY Asylum

RE: Ok...

161.29.252.134

Stephen R

In Reply to: RE: Ok... posted by Chip647 on July 27, 2023 at 07:01:06

Try led, diodes and whatever else you fancy and see what you like.

Here's some measurements in the link.
https://www.bartola.co.uk/valves/2015/05/04/diode-cathode-bi (Open in New Window)

Follow Ups:

RE: Ok... - Eric Chan 01:49:07 07/28/23 (4)
The 1N4007 impedance has even lower, so why use LED then?
- RE: Ok... - Paul Joppa 07:38:26 07/28/23 (2)
  To get the same voltage as a red LED, you need two 1N4007s, which doubles the dynamic resistance.
  - RE: Ok... - Eric Chan 04:18:35 07/29/23 (1)
    The Conrad Johnson ART preamp use 1N4148 2 in series instead of using single RED LED to achieve 1.4V bias
    
    The recovery time for 1N4148 is 4ns which is very fast, is that part of the reason?
    - RE: Ok... - Stephen R 01:11:09 07/31/23 (0)
      It's all about impedance. There is no switching going on in this application.
- RE: Ok... - Stephen R 03:16:45 07/28/23 (0)
  That's a graph of voltage drop. Z of red LED a little lower than 1N4007.

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