it's very easyYes my friend had just bought the same one from Ali ! but I never used a scope in my entire life... maybe it's not so complicated to learn how to use it ?
(I put one item "in my basket")
like a breeze
SE Electronics Z3300a
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like a breeze
Does it do "send & return" ? I mean it generates a sine-wave and analyse it ?
For this price?
It is worth several times more!
no, but we have enough signal generating sources
it measures very precisely the inductance of uH and capacitors of a few pF and transistors, etc., etc
Great ! Yes we have plenty of choice for signal generator...
I come back to the subject of the SC1100: the source decoupling capacitor, 22uF, it passes the negative half-waves of the signal there, right? as for the decoupling capa. of a tube's cathode... right ?
so the quality of this capacitor is important (in my tube assemblies, when I need to decouple, I only do it with Elna Silmic II) > in my last Quad Tube pre the cathodes (1frst & 2nd stages) are not decoupled by choice...
But so, what happens if you don't decouple the source resistor ? you loose gain but you get "less distorsion" and more linear signal ?
I come back to the subject of the SC1100: the source decoupling capacitor, 22uF, it passes the negative half-waves of the signal there, right? as for the decoupling capa. of a tube's cathode... right ?
so the quality of this capacitor is important (in my tube assemblies, when I need to decouple, I only do it with Elna Silmic II) > in my last Quad Tube pre the cathodes (1frst & 2nd stages) are not decoupled by choice...
But so, what happens if you don't decouple the source resistor ? you loose gain but you get "less distorsion" and more linear signal ?
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okay,
Bon appétit
Good evening!
Bon appétit
Good evening!
gain and low frequency response are reduced
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so it's not the same as tubes...
In my Quad :
12AY7 K.by x 12AU7 K.by > +47dB
12AY7 K.unby x 12AU7 K.by > +44dB
12AY7 K.by x 12AU7 K.unby > +42dB
12AY7 K.unby x 12AU7 K.unby > +39db
That's my choice (last K unby) because I've got plenty of gain when associated with the EA2622 CAPI (1:7 / +17dB)
So 39 + 17 = +56dB > with static mics its alright (I don't often use ribbon or dynamic > or if so it is with MicBooster from KT > +20dB)
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Among transistors, jFETs have the closest behavior to tubes (configured as) triodes
25-30 years ago I built with jFETs (J201,2N5457) the famous Marshall, Bogner, Mesa-Boogie, Rivera etc. pre-amplifiers and obtained the tube sound in pedal effects.
The most famous guitar pre of amp of all time is reproduced here with jFETs
Marshall JCM800.
25-30 years ago I built with jFETs (J201,2N5457) the famous Marshall, Bogner, Mesa-Boogie, Rivera etc. pre-amplifiers and obtained the tube sound in pedal effects.
The most famous guitar pre of amp of all time is reproduced here with jFETs
Marshall JCM800.
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I have this Waves InPhase plug-in installed in my Logic Pro
But I think the Melda is more accurate @ appropriate...
https://www.thomann.de/fr/meldaproduction_mmultianalyzer.htm
Attachments
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Hi !
I tried to replace the original transformer but it does not work and it must short circuit because I lose my supply voltages coming from 48v...
So I replaced the Monacor wired according to diagram "A" and here instead of -6dB compared to the original microphone I have +4dB (i.e. a gap of 10dB!)
I'm also thinking of changing the Tr of the other microphone for a good balance between the two
Now I'm going to bias the 2 Jfets according to the method recommended by @micolas with REW's scope and tone generator
To be continued...
I tried to replace the original transformer but it does not work and it must short circuit because I lose my supply voltages coming from 48v...
So I replaced the Monacor wired according to diagram "A" and here instead of -6dB compared to the original microphone I have +4dB (i.e. a gap of 10dB!)
I'm also thinking of changing the Tr of the other microphone for a good balance between the two
Now I'm going to bias the 2 Jfets according to the method recommended by @micolas with REW's scope and tone generator
To be continued...
With the proper bias the level has leveled down and fits now the original mic
on the picts, one can see that without any R after the R source 1,8KΩ the signal has more neg. than pos. / with the R 6,8KΩ the signal seems equal (but with less gain)
So now, this modifyed mic's electronic is done : will install the Arienne k47-flat (but first I got to work on the original one > change the transformer & bias the Fet)
Of course I will record with the pair (in omni & cardio) before changing the capsules...
on the picts, one can see that without any R after the R source 1,8KΩ the signal has more neg. than pos. / with the R 6,8KΩ the signal seems equal (but with less gain)
So now, this modifyed mic's electronic is done : will install the Arienne k47-flat (but first I got to work on the original one > change the transformer & bias the Fet)
Of course I will record with the pair (in omni & cardio) before changing the capsules...
Attachments
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Did you make simultaneous recordings with the stock microphone and the modified one, before changing the capsules, transformer, etc.?
As I told you, going from a transformer ratio of 2:1 to 1.5:1 will increase the output level.
It's on my to-do list : record as it is now (one modified - one not) then the 2 modified (Tr & bias) before changing the capsules.
What do you think of my Fet biasing ? Does it seem ok for you ?
As I said I rejoigned the original gain level but the signal wave is clean with the add of 6,8KΩ
What do you think of my Fet biasing ? Does it seem ok for you ?
As I said I rejoigned the original gain level but the signal wave is clean with the add of 6,8KΩ
The diagnosis was correct:
The insulation resistance of the secondary of the original transformer is compromised
measure the voltages in the important points, including the transistors, after BIAS ing, to be able to compare them with the original
After each change or adjustment, you have to make new measurements, tests, records, comparisons, etc.,to make observations and analyze
Only then will you know the real effect of each change.
All this is very helpful for you and for everyone who follows the subject.
After re-Biasing how did the tonal character of the modified microphone compare to that of the stock microphone?
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