In Reply to: ok, what is happening here???? posted by vinnie2 on December 3, 2016 at 12:10:48:
Vinnie, this is the issue I described earlier about some of the lighting transformers I purchased more recently. They should output 24V pk-pk, but they're running about 30-35V instead. The only way to reduce this is with resistors. Even at 24V (12V rms), I had to do that for my 10V filaments.
My suggestion is to first load it more heavily. Wire two or preferably three of your 813 filaments in series and connect them to the output. Then examine it again with your scope. With careful trimming of the Trigger Level control, you should be able to get a fairly clean display.
Report back regarding amplitude and waveshape. :)
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Follow Ups
- RE: ok, what is happening here???? - Triode_Kingdom 13:58:37 12/03/16 (27)
- RE: ok, what is happening here???? - vinnie2 14:29:15 12/03/16 (10)
- RE: ok, what is happening here???? - cpotl 14:46:45 12/03/16 (9)
- Frequency and Wave Shape - Triode_Kingdom 17:24:55 12/03/16 (5)
- RE: Frequency and Wave Shape - vinnie2 17:55:54 12/03/16 (4)
- RE: Frequency and Wave Shape - Triode_Kingdom 18:09:07 12/03/16 (3)
- RE: Frequency and Wave Shape - vinnie2 18:17:44 12/03/16 (2)
- RE: Frequency and Wave Shape - Triode_Kingdom 18:20:09 12/03/16 (1)
- RE: Frequency and Wave Shape - vinnie2 18:22:07 12/03/16 (0)
- RE: ok, what is happening here???? - vinnie2 15:03:34 12/03/16 (2)
- RE: ok, what is happening here???? - cpotl 17:45:34 12/03/16 (1)
- RE: ok, what is happening here???? - vinnie2 17:57:11 12/03/16 (0)
- RE: ok, what is happening here???? - vinnie2 14:21:51 12/03/16 (15)
- Careful Vinnie, that's not what I said! - Triode_Kingdom 17:12:19 12/03/16 (12)
- RE: Careful Vinnie, that's not what I said! - vinnie2 17:16:15 12/03/16 (11)
- RE: Careful Vinnie, that's not what I said! - Triode_Kingdom 17:19:15 12/03/16 (10)
- RE: Careful Vinnie, that's not what I said! - vinnie2 18:00:44 12/03/16 (9)
- RE: Won't work like that with the variac. - megasat16 18:30:27 12/03/16 (4)
- RE: Won't work like that with the variac. - vinnie2 02:58:13 12/04/16 (2)
- Output Transformer - Triode_Kingdom 10:59:51 12/04/16 (1)
- RE: Output Transformer - vinnie2 14:51:13 12/04/16 (0)
- RE: Won't work like that with the variac. - Triode_Kingdom 21:06:31 12/03/16 (0)
- RE: Careful Vinnie, that's not what I said! - Triode_Kingdom 18:12:34 12/03/16 (3)
- RE: Careful Vinnie, that's not what I said! - vinnie2 18:25:13 12/03/16 (2)
- RE: Careful Vinnie, that's not what I said! - megasat16 18:35:03 12/03/16 (1)
- RE: Careful Vinnie, that's not what I said! - vinnie2 03:00:13 12/04/16 (0)
- One puppy per tube - RayP 16:15:00 12/03/16 (1)
- RE: One puppy per tube - vinnie2 17:15:27 12/03/16 (0)