check what jFet you have in DC/DC
SE Electronics Z3300a
- Thread starter TornadoTed
- Start date
Help Support GroupDIY Audio Forum:
I will Micolas and let you know soon (I'm not at home)
Thanx for your help & advice
I'm glad to have bought this SC1100 for $85 ! I felt there was something to do with it... knowing also that second hand z3300 are usually sold for more-or-less $250 !
Thanx for your help & advice
I'm glad to have bought this SC1100 for $85 ! I felt there was something to do with it... knowing also that second hand z3300 are usually sold for more-or-less $250 !
Yeah, and..? Is it supposed to affect the audio signal in any (positive) way?
No way! But it can be replaced with any jFet, (I put BF245) and 2SK105 can be tested in a U87 clone. Unfortunately mine had Idss=2.3, however it worked in U87ai.
Not all of us can afford 2N3819 NOS.
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I sacrificed a working Crate guitar combo from the 80's to get 2 jFet 2N3819 Motorola (Idss 8..9mA) out of it. In U87ai with them I have Us 1,3..1,4v at correct bias... Not that that's uber-mega-"magical" in any way...
With Mouser's 2N3819 CEN, same Idss, I measured Us 2.7..2.9v, and Ud>12v.
The sound was a little different, a different tonal balance.
I think Central Semiconductor uses a different technological process, materials or semiconductor purification methods.
I have tested all the jFets I have new or old, of all types. They all sound different. Sometimes the difference is big.
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It's well known here that the retail new 3819's have nothing in common with the old ones.
That being said, you're kinda making it sound like absolutely NO other JFET readily available nowadays could be used
Which i'm pretty sure is not the case...In Europe it's harder to get good NOS jFETs.It's well known here that the retail new 3819's have nothing in common with the old ones.
That being said, you're kinda making it sound like absolutely NO other JFET readily available nowadays could be used
Now you understand my excitement when I found the 2SK105.
Anyway, I will leave tradition aside and try some jFETs from Linear Systems
Very expensive
With this money I bought 2 used microphones, in working condition, they can be modified or they contain all the specific parts necessary for the construction of a microphone. With the jFet 2SK30a, which I really like.
Not. They are hard to find. But they were in the microphones, selected, they sounded good, little noise, exactly like the few 40-year-old ones I have.
Wait!
I bought Chinese ones, measured them, put a socket in the microphone and compared them with the best
Almost all were very good, in terms of specifications.
It was a pleasant surprise.
Link:
https://a.aliexpress.com/_Euw3IOv
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I have a very old se2200, with through-hole parts, whose highs I tamed a bit and increased the capsule's bias voltage. It sounds warm and without a bit of noise.
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I Know. It's difficult to DIY.
That's why I'm looking for old models through the hole, used and cheap.
Even if they are not in working order
Well, it says "sE2200" on the edge of the PCB, so no multipattern to worry about.
Interesting to see they did away with the chassis altogether, Rode NT1 style...
I posted a pict of inside sE2300 (3 patterns)
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... And yet, we see the non-metallized diaphragm, and no wire coming off its center. Where's the photo from?
Seems it might even be from their own page - nice going... And yet, they seem to also have some non-wrong photos?
https://imgcdn.seelectronics.com/cd...A/82d571cb-7c3d-42f5-5506-ff524c7a2100/w=2144
