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Old 30th March 2012, 10:32 AM   #861
Skorpio is offline Skorpio  Denmark
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Originally Posted by generg View Post
o.k. so I will give my "gyrating chair" back and try this treatment....

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Perhaps it is due to language, but my issue was this:

What you earlier called a CCS, I call a Gyrator. A gyrator is an electronic circuit (here upper MOSFET) emulation an Choke/Inductor.

So perhaps this circuit is perhaps more like the Hammond sound?
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Old 30th March 2012, 10:36 AM   #862
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Generg's version is sort of Mu follower , at least Papa as calls it

search online for great book : A . Vogel , How to gain gain_A Reference Book on Triodes in Audio Pre-Amps
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Old 30th March 2012, 11:50 AM   #863
Skorpio is offline Skorpio  Denmark
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Originally Posted by Zen Mod View Post
Generg's version is sort of Mu follower , at least Papa as calls it

search online for great book : A . Vogel , How to gain gain_A Reference Book on Triodes in Audio Pre-Amps
Mu follower might be the whole circuit (both MOSFETs), take a look here:

If You Don't Have a SIT, Fake It...
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Old 30th March 2012, 12:01 PM   #864
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yup , I meant on whole output stage , what else ?

what's important is principle of operation , not breed of parts used

use hexode , if you want ....
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Old 30th March 2012, 12:23 PM   #865
Skorpio is offline Skorpio  Denmark
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yup , I meant on whole output stage , what else ?

what's important is principle of operation , not breed of parts used

use hexode , if you want ....
If you read back you might see it....

Even if a CCS is part of a design, you wouldn't call the whole design for CCS...but here we were adressing a certain part of the design

And nobody talking parts....just refering to upper and lower device in drawing in question...
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Old 30th March 2012, 12:47 PM   #866
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you lost me there ..........



some schmtcs are with CCS

Generg's one is adjustable between "pure" CCS and Mu-like modulated one

I still didn't saw pure gyrator in schm posted recently in this thread
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Old 30th March 2012, 01:01 PM   #867
Skorpio is offline Skorpio  Denmark
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Originally Posted by Zen Mod View Post
you lost me there ..........



some schmtcs are with CCS

Generg's one is adjustable between "pure" CCS and Mu-like modulated one

I still didn't saw pure gyrator in schm posted recently in this thread

1. "Mu-follower" = Gain device + Gyrator device

2. Aleph = Gain device + dynamic CCS

3. Zen1 = Gain device + CCS

I am not shure about point 1, therefore the "" markings, but I think Generg' drawing shows gyrator like configuration....but you might call it NCCS

(not constant current cource)
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Old 30th March 2012, 01:07 PM   #868
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Originally Posted by Skorpio View Post
1. "Mu-follower" = Gain device + Gyrator device

....
sort of .....

we are talking of same thing , in different way

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Old 30th March 2012, 03:36 PM   #869
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I have luck, I am no expert......only a copyist....


But to understand the upper part as gyrator is interesting....
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Old 30th March 2012, 08:12 PM   #870
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Yes, I was useing them as a load for a ZV9 and up above 1A, and 100Hz, they worked well but, at about 3k they became a transducer! I think , as Mike said, it's only during peaks! I was doing full power sine waves(you really should almost never do that!). But I think with a little Vacuum empregnated epoxy most of the radiated sound will be many DB down! I will give it another go But I want to finish my F5 and a few other projects!
i have also heard the hammond sing with no speaker connected . but i have also heard the same from my tube amplifier output transformer ( hashimoto) when there is no load on it. don't really think it can degrade the sound at normal level.
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