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Messages - KMG

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1
Preamps and Effects / Re: Fet version of the JCM800
« on: May 17, 2017, 08:28:29 AM »
Instead ES1J you can use any Superfast(Ultrafast) Rectifier Diodes with the same specs.
Quote
can I use two BAT85 instead of BAT54
Yes.

2
Preamps and Effects / Re: Fet version of the JCM800
« on: April 14, 2017, 09:19:09 AM »
Now I have only "full version" boards (preamp+5WPA+PS)

For separate preamp I can offer gerber/drill files:
jcm800mvfGerber.zip

3
Preamps and Effects / Re: Fet version of the JCM800
« on: April 13, 2017, 12:04:16 PM »
Hi guys.
Unfortunately my IP was erroneously banned for a long time.
Now I returned back.
About
Quote
Hi, any one knows who have build this?
Many people build this preamp by youself, but unfortunately not in in English speaking countries (Russia, Ukraine, Israel). Many peoples purchased full version (F-800) with 5W poweramp.
I strongly recommend you to build LND150 version of preamp by the two reasons:
1. 2SK216 is very difficult to buy (they end of production, there are many fake ones at ebay)
2. LND150 more close by sound to the tube one.
Also this version does not require any trimming after assembling.
Some responces about sound of the F-800 you can read in this thread http://forum.guitarplayer.ru/index.php?topic=273237
Unfortunately in Russian, but you can use Google translate.

4
Quote
Does anybody know who this US company is?
http://www.jetcityamplification.com/#!retrovalves/ctjr

5
Amplifier Discussion / Re: KMG SS Poweramps
« on: October 11, 2013, 12:38:25 PM »
Quote
Hey! Any news about those transistors?
Not yet, I'm very busy now by official job.
Quote
Hi Mike,

Would these be suitable transformers for your 5W FET amp?

http://www.classictone.net/40-18030.html
or
http://www.classictone.net/40-18031.html
I don't tried SE transformer FET PA.

7
And what about these? http://www.jetcityamplification.com/2012/05/06/retrovalve-amber/
I didn't hear these devices.

The main benefit of 12AX7WS is very accurate emulation of triode V/A curves.

8
THChrist, all specs you can find in official datasheet
http://www.amtelectronicsusa.com/AMT12AX7WS.pdf
Phil, I tried to make the most of a fair test:
- I used only one type of tubes while recording (no mix of tubes)
- I didn't change control positions & mic position between recordings.
- I used reamp to eliminate difference in playing.

9
Comparision test of 12AX7WS and 12AX7EH, guitar tracks & mix tracks.
Tube preamp JCM800+FET 5W+4x12, gain at 2 hours, tone stack at middle.
WAV 44м
mp3 10м

PS 12AX7WS page.
http://amtelectronicsusa.com/productpage12AX7WS.html

10
Amplifier Discussion / Re: KMG SS Poweramps
« on: May 31, 2013, 09:29:03 AM »
Some time ago I found very interesting MOSFETS IXTP01N100D.
http://ixapps.ixys.com/DataSheet/DS98809C%28IXTP-U-Y01N100D%29.pdf
1kV of the drain voltage, 25W power dissipation. That allows to use them with standard transformers for tube amplifiers.
I already received ten of them from arrow electronics.
Now I'm waiting for the ordered transformer http://www.classictone.net/40-18045.pdf to start testing.


11
Preamps and Effects / Re: Fet version of the JCM800
« on: May 21, 2013, 05:44:11 AM »
FET JCM800+5W (Clean, input Low) video test by Konstantin Dolotov, camera mic
http://www.youtube.com/watch?v=VTPZJFrwnPQ

12
Preamps and Effects / Re: Fet version of the JCM800
« on: May 20, 2013, 07:57:44 AM »
FET JCM800+5W (Clean, input Low) video test by Konstantin Dolotov, MD421 mic.
http://www.youtube.com/watch?v=1PUBfrtLzK0

13
Preamps and Effects / Re: Fet version of the JCM800
« on: April 03, 2013, 12:11:02 PM »
Video test by Konstantin Dolotov (camera mic)
http://www.youtube.com/watch?v=cB5XaE_vEJk

14
Preamps and Effects / Re: Fet version of the JCM800
« on: March 14, 2013, 07:41:07 AM »
First "production" item of SS JCM800+5W




15
Preamps and Effects / Re: Fet version of the JCM800
« on: March 08, 2013, 10:56:11 AM »
Sх_1 - Tube
Sх_2 - Fet

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