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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: 6C33 OTL posted by sprussog on February 17, 2014 at 12:27:43:
Hi Steffen !
Basically I agree with Lew observation & opinion !
Just to add :
1) 155 VDC per PSU phase is little beat to high voltage for 6c33c-b power tubes , 100 - 120 VDC is much better choice .
2) Each 6c33c-b power tube Must have asociated cathode power W.W . load resistor of at least 1 ohm value , ( personaly I prefer 10 ohm W.W.power res. connected in parallel with 1000uF/35 VDC Elko for each 6c33c -b cathode ) .
3) Each 6c33c-b Must have asociated slow blow 1.2A fuse conected in cathode circuit .
4 ) Separate driver triode ( 1/2 of 6sn7 ) for each output 6c33c-b power tube is Much Better solution than common driver triode , since this approach allow exact separate output power tubes bias without to need close & precise match of 6c33c-b quad .
5 ) Single input differential cascoded voltage gain stage ( typical for Atma-Sphere OTL Amp-s ) is Much better solution than solution from your presented schematic from many reason .
6) Two ground reference resistors (R21-R22) have to small value ( 39R ) , I suggest there to be at least 330R / 5W values .
Best Regards !
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Follow Ups
- RE: 6C33 OTL - Banat 05:33:52 02/18/14 (41)
- RE: 6C33 OTL - roio 09:58:02 09/06/14 (4)
- RE: 6C33 OTL - Banat 08:22:29 09/08/14 (3)
- RE: 6C33 OTL - roio 11:45:16 09/08/14 (2)
- RE: 6C33 OTL - Banat 12:50:52 09/08/14 (1)
- RE: 6C33 OTL - roio 13:41:27 09/08/14 (0)
- Question for Banat - Lew 10:45:03 02/18/14 (35)
- RE: Question for Banat - Banat 08:07:09 02/19/14 (7)
- Another question about the cathode bypass capacitor - Lew 06:53:11 02/20/14 (6)
- RE: Another question about the cathode bypass capacitor - Banat 14:13:09 02/20/14 (3)
- I think I understand - Lew 14:30:34 02/20/14 (2)
- Just FWIW - Ralph 09:41:39 02/21/14 (1)
- Yes, I agree, 2 Hz cut-off - Lew 10:44:31 02/21/14 (0)
- RE: Another question about the cathode bypass capacitor - tyu 07:34:02 02/20/14 (1)
- I had a new question for Banat - Lew 08:12:53 02/20/14 (0)
- RE: Question for Banat - cpotl 18:09:33 02/18/14 (26)
- RE: Question for Banat - Lew 18:55:30 02/18/14 (25)
- Circlotron........... - tyu 22:52:18 02/18/14 (19)
- RE: Circlotron........... - cpotl 06:52:57 02/19/14 (18)
- FWIW - Ralph 08:11:18 02/19/14 (16)
- RE: FWIW - cpotl 08:57:24 02/19/14 (15)
- RE: FWIW - Ralph 11:45:42 02/19/14 (14)
- RE: FWIW - cpotl 19:04:19 02/19/14 (13)
- RE: FWIW - Ralph 09:03:26 02/20/14 (12)
- RE: FWIW - cpotl 09:49:48 02/20/14 (11)
- RE: FWIW - Banat 12:58:26 02/20/14 (4)
- RE: FWIW - cpotl 13:52:05 02/20/14 (3)
- Chris, Thanks for the comment on AC and DC currents - Lew 12:29:40 02/20/14 (0)
- RE: FWIW - Ralph 10:55:32 02/20/14 (3)
- What I was thinking too: much larger cathode resistors,... - Lew 12:28:15 02/20/14 (2)
- not so fast- - Ralph 12:56:42 02/20/14 (1)
- Yes, thought of that too, - Lew 14:32:56 02/20/14 (0)
- RE: FWIW - tyu 10:51:12 02/20/14 (0)
- RE: Circlotron........... - tyu 08:08:22 02/19/14 (0)
- RE: Question for Banat - cpotl 19:31:56 02/18/14 (4)
- RE: Question for Banat - Lew 08:34:36 02/19/14 (3)
- RE: Question for Banat - Banat 09:17:13 02/19/14 (2)
- RE: Question for Banat - cpotl 11:19:39 02/19/14 (1)
- RE: Question for Banat - Lew 11:29:10 02/19/14 (0)
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