Here's the schematic of the lighting transformer (basis for ultrasonic filament supply) discussed in the threads below. This is the 60W version, but I'm sure they're all similar. Component designations are those on the board, except for T1 and T2, which are unmarked. I also located an online writeup of this type switcher at the link below. I can't vouch for the accuracy of the entire theory discussion, but it looks interesting.
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Topic - 60W Lighting Transformer Schematic - Triode_Kingdom 21:28:51 11/19/16 (32)
- ok, so now I am really confused..... - vinnie2 11:04:32 11/20/16 (30)
- A Question About Your Switcher - Triode_Kingdom 09:45:44 11/21/16 (12)
- RE: A Question About Your Switcher - vinnie2 12:42:47 11/21/16 (11)
- That's Very Interesting - Triode_Kingdom 13:39:30 11/21/16 (10)
- Little Switcher - Triode_Kingdom 18:13:52 11/21/16 (8)
- RE: Little Switcher - vinnie2 05:07:31 11/22/16 (7)
- RE: Little Switcher - Triode_Kingdom 07:38:33 11/22/16 (6)
- RE: Little Switcher - vinnie2 08:51:41 11/22/16 (5)
- RE: Little Switcher - Triode_Kingdom 09:21:42 11/22/16 (4)
- Sometimes You Can't Win - Triode_Kingdom 20:26:15 11/22/16 (3)
- RE: Sometimes You Can't Win - vinnie2 06:08:39 11/23/16 (2)
- 3A Switchers - Triode_Kingdom 08:23:10 11/23/16 (1)
- RE: 3A Switchers - vinnie2 09:44:30 11/23/16 (0)
- RE: That's Very Interesting - vinnie2 18:05:58 11/21/16 (0)
- RE: ok, so now I am really confused..... - Triode_Kingdom 11:55:39 11/20/16 (16)
- RE: ok, so now I am really confused..... - vinnie2 13:45:44 11/20/16 (15)
- RE: Output chassis ground - gusser 09:00:14 11/21/16 (1)
- RE: Output chassis ground - Tre' 09:45:36 11/21/16 (0)
- RE: ok, so now I am really confused..... - Triode_Kingdom 20:23:54 11/20/16 (12)
- RE: ok, so now I am really confused..... - vinnie2 04:03:49 11/21/16 (11)
- Switcher Filter - Triode_Kingdom 09:05:29 11/21/16 (10)
- RE: Switcher Filter - vinnie2 13:14:19 11/21/16 (9)
- RE: Switcher Filter - Triode_Kingdom 13:43:49 11/21/16 (8)
- RE: Switcher Filter - vinnie2 15:48:22 11/21/16 (1)
- Hum Pot - Triode_Kingdom 18:17:10 11/21/16 (0)
- RE: Switcher Filter - vinnie2 13:55:40 11/21/16 (5)
- RE: Switcher Filter - Triode_Kingdom 14:04:39 11/21/16 (4)
- RE: Switcher Filter - vinnie2 15:47:00 11/21/16 (1)
- RE: Switcher Filter - Triode_Kingdom 18:28:52 11/21/16 (0)
- let's hope he doesnt have a cat -nt- - elblanco 15:32:57 11/21/16 (1)
- Don't laugh! - Triode_Kingdom 18:33:37 11/21/16 (0)
- RE: 60W Lighting Transformer Schematic - RayP 04:52:16 11/20/16 (0)