You meen just the SEWA without the tubes?
With tube I would like about 1,5-2v.😉
Will try it with just the ECC86 when I get all the parts,jleaman and Geek plaese post schematics for new ideas,🙂 Im not realy sure when or where I can use Direct copling.
Hybrid SEWA
Hi!
+/-12-15V! So, you need a lot of gain from the line stage.
I am afraid that a simple CF with ECC86 or 88 will be not enough to drive the SEWA because the Mosfet's high input capaticantes.
Ryssen, you should try the Swedish REMUS preamp!
Greets:
Tyimo
Hi!
+/-12-15V! So, you need a lot of gain from the line stage.
I am afraid that a simple CF with ECC86 or 88 will be not enough to drive the SEWA because the Mosfet's high input capaticantes.
Ryssen, you should try the Swedish REMUS preamp!
Greets:
Tyimo
Re: Hybrid SEWA
Hi Guys,
Yup!
Oh, at most. I usually aim for 0.7 VRMS with 1V max.
Schematics for sure from me. I'm an open-source type guy 🙂
Thanks!
Not much gain really, +/- 15V is 30V P-P which is dozing for a tube 😉
Pump up the current, pump up the current, DANCE! 😀
Fortunately most of the totem designs I've used I have tested as stable into moderate capacitances. Knowing these plasti-tubes though, I should test for as high as 10nF maybe?
Cheers!
Hi Guys,
Ryssen said:
Yup!
Oh, at most. I usually aim for 0.7 VRMS with 1V max.
Schematics for sure from me. I'm an open-source type guy 🙂
Tyimo said:
Thanks!
Not much gain really, +/- 15V is 30V P-P which is dozing for a tube 😉
Pump up the current, pump up the current, DANCE! 😀
Fortunately most of the totem designs I've used I have tested as stable into moderate capacitances. Knowing these plasti-tubes though, I should test for as high as 10nF maybe?
Cheers!
He,he I built that one about 16 years ago..But where I am going to use/test this amp is with my computer-modded audiophile 2496,allright I post a pic so you can se for your self.it has a "Brute force" linestage
maybe it could drive the SEWA direct.But now I decided to make SEWA a hybrid.😀 😉
well if I use a ecc86 as voltamp and ecc88 as CF it might work.or
comments, schemas..😀
Computerstereo...
Attachments
I think the beauty of SEWA lies in its simplicity, and I think you loose it along the way
All it needs is preamp with gain
If you build a tube into the SEWA you will need a pre anyway
So why not simply build a nice tubed preamp with the needed gain
All it needs is preamp with gain
If you build a tube into the SEWA you will need a pre anyway
So why not simply build a nice tubed preamp with the needed gain
Hi!
Yes! I agree!
Unfortunately I have never listened a realy good Hybrid power amp ( yet....) 😉
Tyimo
Yes! I agree!
Unfortunately I have never listened a realy good Hybrid power amp ( yet....) 😉
Tyimo
tinitus said:
Some people leave for a long distance to find gold, and return
back home with no finding. Next day, suddenly find lot of gold
at home ground.
But, the journey itself is a fun.
Ofcorse I will try the SEWA whitout any tubes,As I have 2 holes for 9 pin socket in my top,sure would like some glowing tubes there.😉
Maybe try if I can run the SEWA direct from the soundcard wihtout the
"Brute force" simplicity...
How much is needed in RMS?My sound card puts out 2v...maybee just a litlle tub in SEWA..
The sub is 2 x CA21REX SEAS,and PX17-LTS and Gamma ribbonspeakers,the sensitiviy is about 90db/w.Deepbass and clear top end.I used to power it with 6B4 SE and it sound fine.🙂
I´ve spent the whole night experimenting with ECC86 and mosfets. I tried BJT CCS loading with and without Jfet buffer, hybrid Mu-stage with Jfet on top, choke loading with and without buffer and nothing seems to be able to push a simple Mosfet power follower past 20kHz!
I guess ECC86 simply isn´t a good candidate for the job, and it´s a shame cause I came up with some really neat direct coupled hybrid amp topologies last night...
Since I have everything set up I´ll try PCC88 in the same circuits, it might or might not work better. I have my doubts though, tubes seems to like voltage and Mosfets require some current in the driver stage.
I guess ECC86 simply isn´t a good candidate for the job, and it´s a shame cause I came up with some really neat direct coupled hybrid amp topologies last night...
Since I have everything set up I´ll try PCC88 in the same circuits, it might or might not work better. I have my doubts though, tubes seems to like voltage and Mosfets require some current in the driver stage.
Fuling said:
88 like current,but you'll not have much of current with this sissy voltage......🙁
I noticed that, yes.
I gave up on the whole thing, but right now I´m prototyping something involving mosfets, Jfets and chokes but no tubes.
I gave up on the whole thing, but right now I´m prototyping something involving mosfets, Jfets and chokes but no tubes.
tinitus said:
But where do you put it? The last one Ryssen posted is a SEWA with a CCS loaded Foreplay-style (CC direct coupled to a CF) preamp in front.
dave
inductor versions
Hi Fuling!
Could you simulate and/or calculate how big inductor would need for the original SEWA amp instead of the 10R 100W power resistor? (Now it is called OTA7) I would like to try an inductor loaded version.
Greets:
Tyimo
Hi Fuling!
Could you simulate and/or calculate how big inductor would need for the original SEWA amp instead of the 10R 100W power resistor? (Now it is called OTA7) I would like to try an inductor loaded version.
Greets:
Tyimo
Ryssen said:Commenst on this please.
I think it's worth a try! 🙂
10.62 VRMS (sinewave)
I recall seeing somewhere (another forum?) someone saying 7 VRMS. Close enough in the dBV scheme of things 😉