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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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In Reply to: RE: Listening to my New Korneff Clone 45 SET Amps ................. posted by Cut-Throat on March 27, 2021 at 07:29:23:
I understand that. I am asking what do you do to keep the bass out of the 45 SET amplifier?Even though you have a passive crossover keeping the bass out of the horn, if you don't do something to keep the bass out of the 45 SET amplifier the load line for the mids and highs will follow an elliptical load line because of the presents of the bass. No gapped output transformer has enough inductance to properly deal with low bass frequencies. This leads to distortion of all the frequencies.
Try this, add your best .015uf capacitor in series with the 100k input impedance of the 45 amplifier. I like the Russian Silver mica caps.
This will create a 6db high pass filter at about 100Hz and greatly improve that amplifiers performance in the mids and highs without changing your 270Hz crossover point. The load line for the mids and the highs will become much more "resistive" leading to less harmonic distortion.
Voltsecond did a study of inductance and elliptical load lines and made the very point I am trying to share with you.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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Follow Ups
- RE: Listening to my New Korneff Clone 45 SET Amps ................. - Tre' 03/27/2107:41:54 03/27/21 (39)
- RE: tried the input cap mod ... - deathtube 667 18:54:14 03/28/21 (5)
- I asked the guy that Designed my Horn System this question ......... - Cut-Throat 13:11:03 04/1/21 (0)
- I have no explanation for that. nt - Tre' 17:27:00 03/30/21 (1)
- RE: It might be ... - deathtube 667 02:51:42 04/1/21 (0)
- RE: tried the input cap mod ... - Cut-Throat 07:01:48 03/29/21 (1)
- RE: tried the input cap mod ... - deathtube 667 07:40:53 03/29/21 (0)
- "100k input impedance of the 45 amplifier"........ - Cut-Throat 14:49:33 03/27/21 (1)
- I was looking at the wrong schematic, yours is 1meg nt - Tre' 17:26:31 03/27/21 (0)
- My 300B monoblocks have a 100K input resistor to ground... - Ivan303 11:36:43 03/27/21 (2)
- Yes and yes. nt - Tre' 13:47:12 03/27/21 (1)
- except I get 72.34Hz for that combo. nt - Tre' 13:49:16 03/27/21 (0)
- RE: Listening to my New Korneff Clone 45 SET Amps ................. - Tre' 08:01:35 03/27/21 (0)
- OK, Thanks ........... - Cut-Throat 08:00:45 03/27/21 (25)
- That's not the circuit I thought it was - Tre' 08:10:05 03/27/21 (24)
- OK, Great ........................ - Cut-Throat 08:12:38 03/27/21 (23)
- RE: OK, Great ........................ - Tre' 08:40:01 03/27/21 (22)
- RE: OK, Great ........................ - 91derlust 17:02:12 03/27/21 (3)
- RE: OK, Great ........................ - Tre' 17:30:17 03/27/21 (2)
- RE: OK, Great ........................ - 91derlust 20:36:56 03/27/21 (1)
- "some of the compromises mentioned can be overstated". Agreed. nt - Tre' 06:50:37 03/28/21 (0)
- Why did he select 100 Hz ? .... Why not 200 Hz or ?? ........nt - Cut-Throat 08:53:46 03/27/21 (16)
- No, I selected it - Tre' 09:19:31 03/27/21 (15)
- Got a Source for some .0015 uf Caps ? .................. - Cut-Throat 13:05:51 03/27/21 (13)
- RE: Got a Source for some .0015 uf Caps ? ......yes............ - awsjr 04:07:39 03/28/21 (0)
- RE: Got a Source for some .0015 uf Caps ? .................. - Tre' 13:28:17 03/27/21 (11)
- E-Bay has quite a few .......................... - Cut-Throat 14:27:48 03/27/21 (1)
- RE: E-Bay has quite a few .......................... - Tre' 14:46:42 03/27/21 (0)
- On my setup... - Tre' 13:40:33 03/27/21 (2)
- Here are some very Spendy Ones from England ...... - Cut-Throat 13:44:31 03/27/21 (1)
- RE: Here are some very Spendy Ones from England ...... - Tre' 14:19:21 03/27/21 (0)
- "Why is the grid resistor 1 meg?" ....................... - Cut-Throat 13:39:48 03/27/21 (5)
- Well, if your preamp don't mind... - Tre' 13:52:23 03/27/21 (4)
- RE: Well, if your preamp don't mind... - RPMac 15:32:47 03/28/21 (3)
- RE: Well, if your preamp don't mind... - Tre' 16:24:21 03/28/21 (2)
- RE: Thanks a lot nt - RPMac 05:00:20 03/29/21 (0)
- Link to online calculator - Tre' 16:47:46 03/28/21 (0)
- OK, makes sense..................... nt - Cut-Throat 10:21:40 03/27/21 (0)
- I'll definitely try this ...................... - Cut-Throat 08:44:17 03/27/21 (0)
- A .015uf cap will do the job. nt - Tre' 07:49:21 03/27/21 (0)
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