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Old 12th September 2012, 05:06 PM   #1711
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by triode_al View Post
Having thought a little bit more, I suggest the following schema as a possible option for the bias.

Attachment 300976

It is in line with the JBL schema except that where they use a reference diode/zener I think the bias reference (I use 1k2 with an 2SK30 of Idss of 3,1 mA) should suffice.
The bootstrap ensures the current source sees the same potential all the time.
I have a bootstrap both sides just for the sake of symmetry.

JBL Energizer:

Attachment 300975




  • The diode is a special diode, and as far as I understand it zeners at 1,0V.
  • Else the bias voltage is generated across the 6,2 Ω resistor and the diode just acts as some kind of safety device.
The feedback is local to the driver amp and global, to the input (via a filter that compensates for special JBL loudspeakers).
is there any progress , comparing to previously published bias schemes ?
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Old 12th September 2012, 05:08 PM   #1712
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lhquam: As you continue to tweak and listen to Teaser-6 [JFET], you have the experience and skills [build and sims] to start a new thread entitled [if you wish] "Teaser-6 [SIT] Amplifier". Zen Mod was the one to first suggest using SIT depletion-mode devices instead of JFETs in Conceptual F6. My gut feeling is that SIT devices will quickly find their place in a Conceptual F6 design. It is not a question of if; but rather when; in your case you can make it happen soon.
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Old 12th September 2012, 05:18 PM   #1713
Zen Mod is offline Zen Mod  Serbia
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what's stopping ya to do the same ?


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Old 12th September 2012, 05:23 PM   #1714
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Quote:
Originally Posted by Antoinel View Post
lhquam: As you continue to tweak and listen to Teaser-6 [JFET], you have the experience and skills [build and sims] to start a new thread entitled [if you wish] "Teaser-6 [SIT] Amplifier". Zen Mod was the one to first suggest using SIT depletion-mode devices instead of JFETs in Conceptual F6. My gut feeling is that SIT devices will quickly find their place in a Conceptual F6 design. It is not a question of if; but rather when; in your case you can make it happen soon.
Who's bogarting the SITs? None of my good friends have sent any to my door. Probably easier to find diamonds in the backyard. I'll just be happy when F6 schematic arrives. Either on this thread or in my Inbox. Until then, I have plenty of amplifiers that already please my ears. It's just overindulgence and licking the earth from here.
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Old 12th September 2012, 05:26 PM   #1715
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Originally Posted by Zen Mod View Post
what's stopping ya to do the same ?


Unfortunately Zen Mod, I do not have the skill and the experience which you, lhquam and others have to even begin to tackle the current Conceptual F6 [like you all are excelling at] let alone the SIT mod. I leave this challenge to the experts.

Last edited by Antoinel; 12th September 2012 at 05:28 PM.
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Old 12th September 2012, 05:37 PM   #1716
lhquam is offline lhquam  United States
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How do I obtain SITs? The 2SK82 appears to be available from acronmanelectronics through Ebay, but Nelson's SIC SITs are not. I cannot even find a datasheet for the 2SK82.

Quote:
Originally Posted by Antoinel View Post
lhquam: As you continue to tweak and listen to Teaser-6 [JFET], you have the experience and skills [build and sims] to start a new thread entitled [if you wish] "Teaser-6 [SIT] Amplifier". Zen Mod was the one to first suggest using SIT depletion-mode devices instead of JFETs in Conceptual F6. My gut feeling is that SIT devices will quickly find their place in a Conceptual F6 design. It is not a question of if; but rather when; in your case you can make it happen soon.
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Old 12th September 2012, 05:39 PM   #1717
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Originally Posted by Tea-Bag View Post
Who's bogarting the SITs? None of my good friends have sent any to my door. Probably easier to find diamonds in the backyard. I'll just be happy when F6 schematic arrives. Either on this thread or in my Inbox. Until then, I have plenty of amplifiers that already please my ears. It's just overindulgence and licking the earth from here.
Tea-Bag. I find the word plenty in your remark about having plenty of amplifiers remarkable. Is it a private collection of how many amps, and/or any up for sale? My ideas can always be seen and discarded as cheap talk. Just communication for whatever worth.
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Old 12th September 2012, 05:41 PM   #1718
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Originally Posted by Tea-Bag View Post
Who's bogarting the SITs?
I remember a slightly different line from the original song, but it fits, i think.

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Old 12th September 2012, 05:52 PM   #1719
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Originally Posted by buzzforb View Post
I remember a slightly different line from the original song, but it fits, i think.

@antionel
I got 4not for sale, no way.
buzzforb and Tea-Bag. Fortunately, I do not have SIT and JFET or any other hardware for sale [or plan to]. I leave this valuable activity and service to the experts.

Last edited by Antoinel; 12th September 2012 at 06:01 PM.
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Old 12th September 2012, 05:59 PM   #1720
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Originally Posted by lhquam View Post
How do I obtain SITs? The 2SK82 appears to be available from acronmanelectronics through Ebay, but Nelson's SIC SITs are not. I cannot even find a datasheet for the 2SK82.
Mr. Pass and Mr. Rothacher pioneered and/or revived the use of SIT devices. Their articles; especially the two practical ones by Mr. Rothacher and the Thread entitled "L'Amp: A simple SIT Amplifier" are a gold mine of info. Actually, Mr. Rothacher devised his own test equipment and method to generate the Characteristic Curves of 2SK82 in his first article.
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