SY said:
I'm sorry but it seems :-
1.you're taking the mickey
or
2. Its just arrogant
or
3. I'm being really dense
how is it trivial if youve removed the splitter to get a full signal into 2 valves 180 degs out of phase?
and how do you lose the inherent gain in the valve in the first place...
hoping to understand
Ed
vitalstates said:
easy - just put em (output toobz) on CCS , ground one grid and drive other
inherent gain .....loosing ........ there are few ways to do this , but dunno what SY does ;
besides - I'm pretty sure that he is teasing ya slightly .
just give him time to prepare what he need to prepare and I'm sure that you'll have what to read and think - for few evenings ......
Ah, sorry. The preamp I built for Variac's F4 was single-ended or balanced in and balanced out. A balanced signal is just perfect for driving a push-pull tube output stage.
Now as to output stages, remember that what the tube giveth, the output transformer taketh away. So for my amp, the output stage grids need to be driven to about 10-11V peak per side to give full output at the secondary of the output transformer. Full output is about 15V peak, so the total output stage is not too far off from unity gain.
Now as to output stages, remember that what the tube giveth, the output transformer taketh away. So for my amp, the output stage grids need to be driven to about 10-11V peak per side to give full output at the secondary of the output transformer. Full output is about 15V peak, so the total output stage is not too far off from unity gain.
thanks SY
the mist has cleared, the simplicity has seeped in..it is indeed a cunning plan and I may well return to this in the fullness of time. With a bit of matching it might be possible to drive this idea directly from my echo digital interface/soundcard.
Regards
Ed
the mist has cleared, the simplicity has seeped in..it is indeed a cunning plan and I may well return to this in the fullness of time. With a bit of matching it might be possible to drive this idea directly from my echo digital interface/soundcard.
Regards
Ed
Fet Insulators
Just Wondering if anyone has any thoughts or experiences with these heat pads. Seems like a good alternative to using mica and grease. (would have been nice if i'd ordered these with the rest of my F4 parts that just arrived 😛 )
Thanks
Dave
Just Wondering if anyone has any thoughts or experiences with these heat pads. Seems like a good alternative to using mica and grease. (would have been nice if i'd ordered these with the rest of my F4 parts that just arrived 😛 )
Thanks
Dave
Member
Joined 2002
Re: Fet Insulators
I personally will never go back to using mica or the rubber type, i strickly only use the ceramic ones. They work VERY well, and will never ever give you a dead short.
The downside to them is, if you torque the screws to tight they crack so snug is all you need, a little thermal grease on both sides and wola perfection 🙂
J
habsrock93 said:
I personally will never go back to using mica or the rubber type, i strickly only use the ceramic ones. They work VERY well, and will never ever give you a dead short.
The downside to them is, if you torque the screws to tight they crack so snug is all you need, a little thermal grease on both sides and wola perfection 🙂
J
I should be able to tell you sometime soon... i just did iniminiminimo and choose silpad... i might move over to mica/grease
this is a tread discussing different options: http://www.diyaudio.com/forums/showthread.php?threadid=37262&perpage=25&pagenumber=1
but first finish my p1.7.. need something to drive this bastard 🙂
cheers
c.
this is a tread discussing different options: http://www.diyaudio.com/forums/showthread.php?threadid=37262&perpage=25&pagenumber=1
but first finish my p1.7.. need something to drive this bastard 🙂
cheers
c.
Attachments
I think that you could.
But, I believe that one of the most merits in the F4 is the fact
of no negative feedback. If I use a pre having no NF, the whole
system (pre+power) could avoid the NF entirely.
My tube pre plus Firstwatt 4 works great 😎
But, I believe that one of the most merits in the F4 is the fact
of no negative feedback. If I use a pre having no NF, the whole
system (pre+power) could avoid the NF entirely.
My tube pre plus Firstwatt 4 works great 😎
carpenter said:
yes you can;
but even your compression driver will remain sleepieeeeeee
you forgot that output stage in Aleph have gain , so this front end gives you really eeeny weeeny modulation .
I would like to correct my comment.
NO, YOU CAN'T!!!
You are applying positive feedback.
When the input is +, the output is -.
The feedback should be +.
NO, YOU CAN'T!!!
You are applying positive feedback.
When the input is +, the output is -.
The feedback should be +.
Babowana said:I would like to correct my comment.
NO, YOU CAN'T!!!
You are applying positive feedback.
When the input is +, the output is -.
The feedback should be +.
Do I need to use a cap?
I will use the pumpkin for stereo listening, but when I use home theater, I need the receiver for dolby. So, I have to come up with a way to enjoy both.