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In Reply to: tube choice posted by pictureguy on July 7, 2021 at 16:13:59:
...-VTA 70 if you need 35 watts, VTA 120 if you need 60 watts and M 125 if you need 125 watts.I would not use a 5AR4 rectifier in either of the two larger amps, asking a single to rectify the B+ for four 6550/KT88/KT120 is, IMHO asking for trouble and I would just use the solid state plug in rectifier, unless having full output is not an issue. And if it's not, I would go with the VTA 70 as you can use EL34 and 6L6 in addition to the already mentioned tubes and the 5AR4 becomes a more viable option,IMHO and YMMV. I prefer the tube rectifier, but if the larger amps and Copper Cap is chosen, there is no need for the soft start circuit. There is no evidence of so called cathode stripping and additional circuit elements, even outside of the circuit path are just complications. Make the circuit as simple as possible and no simpler.
Edits: 07/07/21
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Follow Ups
- Choose by power output...- - viridian 20:11:06 07/07/21 (10)
- RE: Choose by power input...- - Uncle Mike 03:14:17 07/09/21 (0)
- 6L6 peaks my interest... - Rod M 19:41:02 07/08/21 (8)
- 6L6 Outputs - Triode_Kingdom 08:31:57 07/09/21 (7)
- RE: 6L6 Outputs - Rod M 15:55:03 07/09/21 (6)
- RE: 6L6 Outputs - Triode_Kingdom 21:00:09 07/09/21 (5)
- Riddle me this - 1973shovel 04:45:24 07/10/21 (4)
- RE: Riddle me this - Rod M 11:31:42 07/10/21 (1)
- That's probably wise - 1973shovel 09:14:43 07/11/21 (0)
- RE: Riddle me this - Triode_Kingdom 10:45:02 07/10/21 (1)
- RE: Riddle me this - 1973shovel 08:56:52 07/11/21 (0)