Search found 172 matches
- 11 Mar 2015, 13:39
- Forum: DIY Projects
- Topic: Fet version of the JCM800
- Replies: 59
- Views: 27980
Re: Fet version of the JCM800
How accurately does this technique replicate a tube cathode follower? Does it soft clip? Read this article Some nuances of using mosfets as followers in tube guitar amplifiers And futher researches by Victor Kempf (Designer of AMT electronics) Source follower on the high voltage MOSFET as cathode f...
- 28 Feb 2014, 15:15
- Forum: Capacitors
- Topic: The 'Sound' of Capacitors..
- Replies: 695
- Views: 327890
Re: The 'Sound' of Capacitors..
My tests show difference about 2 dB in area 2-3 kHz at level about -25 dB from highest peak at 150 Hz. Under spectrum difference I don't mean low signal frequency response, but different amount of produced harmonics. In overdriven tube stages interstage capacitors works differently than in "lin...
- 28 Feb 2014, 09:04
- Forum: Capacitors
- Topic: The 'Sound' of Capacitors..
- Replies: 695
- Views: 327890
Re: The 'Sound' of Capacitors..
The main difference in spectrum is between Wima & other types of capacitors. I think this is due to the difference in construction - Wima has "comb" construction, other types rolled construction. SBE715_WIMA.jpg But the difference between rolled types of capacitors is also "hearab...
- 27 Feb 2014, 11:09
- Forum: Capacitors
- Topic: The 'Sound' of Capacitors..
- Replies: 695
- Views: 327890
Re: The 'Sound' of Capacitors..
Subtracting tracks is not good way.
Better way is to subtract cumulative spectrums.
Human ear does not "feel" exactly small difference in total volume, but skewness in spectrum products at the same level it "feels" distinctly.
Better way is to subtract cumulative spectrums.
Human ear does not "feel" exactly small difference in total volume, but skewness in spectrum products at the same level it "feels" distinctly.
- 26 Feb 2014, 08:58
- Forum: Capacitors
- Topic: The 'Sound' of Capacitors..
- Replies: 695
- Views: 327890
Re: The 'Sound' of Capacitors..
Interesting test of the different types of capacitors in tube amplifier (unfortunately in russian, use google translate) http://forum.guitarplayer.ru/index.php?topic=301773.0 Comments: - Used reamp to eliminate difference of playing - Same controls & mic position while recording - Measured capac...
- 24 Feb 2014, 13:28
- Forum: DIY Projects
- Topic: Fet version of the JCM800
- Replies: 59
- Views: 27980
- 21 Feb 2014, 16:43
- Forum: DIY Projects
- Topic: Fet version of the JCM800
- Replies: 59
- Views: 27980
Re: Fet version of the JCM800
Tell us little about output transformer made for this amp. 5W PA transformer: Core cross section 20x16 mm Each half bobbin: 120 turns 0.25 mm (1/4) primary 75 turns 0.5 mm secondary (for 8 Ohm load) 120 turns 0.25 mm (1/4) primary http://milas.spb.ru/~kmg/files/projects/fetpa/mp/FetPaMSchS.jpg p.s ...
- 20 Feb 2014, 20:04
- Forum: DIY Projects
- Topic: Fet version of the JCM800
- Replies: 59
- Views: 27980
Re: Fet version of the JCM800
Marshall style design of the F-800 [url=http://"http://milas.spb.ru/~kmg/files/projects/jcm800mv/fet/lnd150/head/frontn.jpg"] http://milas.spb.ru/~kmg/files/projects/jcm800mv/fet/lnd150/head/frontn_th.jpg [/url] [url=http://"http://milas.spb.ru/~kmg/files/projects/jcm800mv/fet/lnd150/...
- 20 May 2013, 11:55
- Forum: DIY Projects
- Topic: Fet version of the JCM800
- Replies: 59
- Views: 27980
Re: Fet version of the JCM800
FET JCM800+5W (Clean, input Low) video test by Konstantin Dolotov
- 03 Apr 2013, 16:08
- Forum: DIY Projects
- Topic: Fet version of the JCM800
- Replies: 59
- Views: 27980
Re: Fet version of the JCM800
Video test by Konstantin Dolotov (camera mic)
- 23 Mar 2013, 16:18
- Forum: Amplifiers
- Topic: Orange Micro Terror
- Replies: 48
- Views: 82059
Re: Orange Micro Terror
I'm not sure about class D, PA looks like TDA or LM based
http://www.squier-talk.com/forum/amp-ri ... error.html
http://www.squier-talk.com/forum/amp-ri ... error.html
- 14 Mar 2013, 11:48
- Forum: DIY Projects
- Topic: Fet version of the JCM800
- Replies: 59
- Views: 27980
- 10 Jan 2013, 09:47
- Forum: DIY Projects
- Topic: Fet version of the JCM800
- Replies: 59
- Views: 27980
Re: Fet version of the JCM800
Test of Prototype. http://milas.spb.ru/~kmg/files/projects/jcm800mv/fet/lnd150/head/Prototype1_th.jpg With SS & Tube preamps. http://milas.spb.ru/~kmg/files/projects/jcm800mv/tube/brdtop_th.jpg Because they have the same board connectors pinouts, swapping was very easy. Controls settings are the...
- 27 Dec 2012, 11:04
- Forum: DIY Projects
- Topic: Fet version of the JCM800
- Replies: 59
- Views: 27980
Re: Fet version of the JCM800
Another several samples
High input, gain at 3.5, TS, presence & depth at middle
High input, crunch
Low input, gain at 8, TS, presence & depth at middle
Low input
Low input + reverb in loop
High input, gain at 3.5, TS, presence & depth at middle
High input, crunch
Low input, gain at 8, TS, presence & depth at middle
Low input
Low input + reverb in loop
- 24 Dec 2012, 07:12
- Forum: DIY Projects
- Topic: Fet version of the JCM800
- Replies: 59
- Views: 27980
Re: Fet version of the JCM800
The planned mini-head design Budget version http://milas.spb.ru/~kmg/files/projects/jcm800mv/fet/lnd150/head/Head20_th.jpg http://milas.spb.ru/~kmg/files/projects/jcm800mv/fet/lnd150/head/Head21_th.jpg Custom version http://milas.spb.ru/~kmg/files/projects/jcm800mv/fet/lnd150/head/Head22_th.jpg http...
- 06 Dec 2012, 08:29
- Forum: Software Room
- Topic: POLL: What is your preferred PCB design software?
- Replies: 43
- Views: 46547
- 04 Dec 2012, 11:57
- Forum: DIY Projects
- Topic: Fet version of the JCM800
- Replies: 59
- Views: 27980
- 28 Nov 2012, 11:39
- Forum: Modern Stompbox Effects (1975 - ...)
- Topic: AMT Electronics - SS-20 [schematic]
- Replies: 21
- Views: 17993
Re: AMT SS-20 [schematic]
Nothing close to Peavey patent
http://milas.spb.ru/~kmg/files/literature/US5647004.pdf
http://milas.spb.ru/~kmg/files/literature/US5647004.pdf
- 27 Nov 2012, 15:28
- Forum: Modern Stompbox Effects (1975 - ...)
- Topic: AMT Electronics - SS-20 [schematic]
- Replies: 21
- Views: 17993
Re: AMT SS-20 [schematic]
"1"
BAS70-04
http://www.nxp.com/documents/data_sheet ... 70_SER.pdf"
2" (True marking is 6L)
MMBF5459
http://www.fairchildsemi.com/ds/MM/MMBF5458.pdf
"3"
MMBTA42
http://www.fairchildsemi.com/ds/MM/MMBTA42.pdf
BAS70-04
http://www.nxp.com/documents/data_sheet ... 70_SER.pdf"
2" (True marking is 6L)
MMBF5459
http://www.fairchildsemi.com/ds/MM/MMBF5458.pdf
"3"
MMBTA42
http://www.fairchildsemi.com/ds/MM/MMBTA42.pdf
- 20 Nov 2012, 18:33
- Forum: DIY Projects
- Topic: Fet version of the JCM800
- Replies: 59
- Views: 27980
Re: Fet version of the JCM800
Same controls setting except master volume turned to MAX position
Mini Head Full Power
Mini Head Full Power