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Messages - Tubis

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Preamps and Effects / Re: Fet version of the JCM800
« on: March 15, 2012, 01:34:21 PM »
So many questions :-[

In the source network...there is a diod called ES1J.
Google says its a silicon fast recovery. Is it crucial or would any old silicon diod do?

What ratings does all the diods in the source demand when it comes to voltage and current?
Im now talking about the lnd150 circuit.

And finaly,  wouldn't it be nice to model the power amp with lnd150 high voltage as well? I can se on your home page that you done a 12V poweramp model. But wouldn it be nice to be able to run that with the preamp at the same voltages?

I like your work by the way....got me all exited. And i happen to have a 100 lnd150 collecting dust at home.

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Preamps and Effects / Re: Fet version of the JCM800
« on: March 14, 2012, 11:32:26 AM »
Whats your take on this circuit?

http://gtlab.net/gtlab4/wp-content/uploads/2009/03/soldano1.jpg
 
How close to tube can that sound?

And why the neagtive supply on that? Dosent that get eaten upp by the drainfeed anyway?

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Preamps and Effects / Re: Fet version of the JCM800
« on: March 14, 2012, 03:31:10 AM »
Some questions to an old post:

1. The 2SK215 circuit has the gate diod feed by the drain. The LMD150 circuit by the source. Why the difference?

2. Why do the circuits need a negative supply on the source and why do that supply need to be buffered?

3. How crucial is the type of diods? You use different types for the two circuits?

4. Does the circuit need to be high voltage or can you get good results with 10times lower voltage?

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