- Posted by gluca (A) on November 24, 2005 at 05:03:49
In Reply to: ping Mike, about that Altec 1570B amp posted by keto on November 23, 2005 at 10:44:06:
KETO!!!! I do like your ideas. Yes I do! The funny thing is that a few days ago I was looking to that Altec schem trying to have inspiration for a new project as well as Jim's posts.That’it! A rough idea not checked but just sketched. I can't do that as my power tranny would not give all the current it needs.
Please folks, just have also a look to the other idea I posted … I do really need advises.
I am wondering how long must we wait to have a MQ PP to PP interstage tranny … LOL!
Ciao Gianluca
Follow Ups:
- Re: ping Mike, about that Altec 1570B amp - keto 05:43:34 11/24/05
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- In Reply to: Re: ping Mike, about that Altec 1570B amp posted by gluca on November 24, 2005 at 05:03:49:
Ciao Gluca,
How about a voltage amp stage before the 807's and drop the last stage? The 811A probably draws a little grid current all the time (this I get from staring at the data sheets, only), and as the grid swings most positive, would seem to draw 40mA or as much as 60mA (or more?), depending on the plate load.
Now I see, you'd limit the 811A's operating range there, making the EXO-099's 10mA cathode draw a good fit.
Mine is only idle scratching, but I'm fascinated with the idea of class B 811A, beyond the "balanced" class B of your schematic, to the PP pair switching on and off, from the sheets, of 750Vp, 5K1 a-a load and shared idle current of 36mA (probably need to plan for 300mA+ swings). And mostly, I wonder what this kind of circuit sounds like.... --keto
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