Wireless World Audio Op-Amp
- Mike H
- Amstrad Tower of Power
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#17
Nick wrote:Yep, thats what I was thinking of. And if you connect out to inv-in you get very close to a augmented cathode follower
How about this for an idea? You get a bit of signal gain as well.
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- EF86 augmented CF.gif (4.22 KiB) Viewed 3748 times
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
- pre65
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#19
So Mike, what would be a practical use for that ?
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- Mike H
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#20
It's an idea I've been kicking around for a while, mentally speaking, basically pentode wired as triode BUT from the output of a CF so it's like negative feedback to screen. That way if CF output is a bit shortcoming due to loading, the gain increases to compensate.
Feasibly you might include the suppressor grid as well.
Feasibly you might include the suppressor grid as well.
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
- Mike H
- Amstrad Tower of Power
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#21
I haven't found a need yet! Nick might have a better ideapre65 wrote:So Mike, what would be a practical use for that ?
Ackshirley one idea might be for a pre-amp / line driver type of thing, that might've been what I was thinking about originally
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
- pre65
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#23
So, could I put it on my GM-70 amp between the CV1285 (6N7) driver and the GM-70 ?
I have some EF86 (Pinnacle) in stock.
I have some EF86 (Pinnacle) in stock.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- Mike H
- Amstrad Tower of Power
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#24
There you are!Nick wrote:A2 driver, Servo amp, Line driver
Could do that, gain may not be much, about 30 - 40-ishpre65 wrote:So, could I put it on my GM-70 amp between the CV1285 (6N7) driver and the GM-70 ?
Short diversion back to the original subject
I have a few CA3046 chips about so here's a CA3046 version. Might actually have a go making this for the tone control module ~ not for the Transis-Tronics amp, but the other one, the 'stand-alone' one
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- WW discretes op-amp CA3046.gif (8.79 KiB) Viewed 3732 times
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
#25
Yes, though I would use it with a split rail supply, but thats no major hardship for a man of your resourcespre65 wrote:So, could I put it on my GM-70 amp between the CV1285 (6N7) driver and the GM-70 ?
I have some EF86 (Pinnacle) in stock.
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
- pre65
- Amstrad Tower of Power
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#26
If I knew how to work out a diagram I might put it on the "to do" list.Nick wrote:Yes, though I would use it with a split rail supply, but thats no major hardship for a man of your resourcespre65 wrote:So, could I put it on my GM-70 amp between the CV1285 (6N7) driver and the GM-70 ?
I have some EF86 (Pinnacle) in stock.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
#28
Yes, though I would add a voltage devider on the front to supply the required DC bias to put -30v (or whatever the design needs) on the output.Mike H wrote:That's to make sure the GM70 grid is at earth potential?
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
- Mike H
- Amstrad Tower of Power
- Posts: 20157
- Joined: Sat Oct 04, 2008 5:38 pm
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#29
Gotcha.
Only thing is it's a normally biased EF86 so don't think it will take that.
Unless you made the cathode high Voltage relative to the negative supply
Only thing is it's a normally biased EF86 so don't think it will take that.
Unless you made the cathode high Voltage relative to the negative supply
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."