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 14th January 2006, 12:24 PM #1 dave dove   diyAudio Member   Join Date: Mar 2005 Location: mid wales partial feedback stuff guys refering to Broskies version of PF: in his article he uses just a resistor from 300B plate to before coupling cap in effect the driver's plate and gives the maths for calculating R http://www.tubecad.com/march2001/page8.html in t.rex he uses 47K followed by 2.2uf from 300B plate to 300B grid http://www.enjoythemusic.com/magazin.../trex/fig1.jpg does anyone have an opinion as to why the two topologies and in the second instance how he calculated C looking forward dave dove
 14th January 2006, 01:29 PM #2 SY   On Hiatus     Join Date: Oct 2002 Location: Chicagoland I get a 403 error from the second link. __________________ "You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
 14th January 2006, 02:17 PM #3 dave dove   diyAudio Member   Join Date: Mar 2005 Location: mid wales SY i just tried it and it works fine try this: http://www.blackdahlia.com/html/tip_50.html dave dove
Bandersnatch
diyAudio Member

Join Date: Jul 2003
Location: Ann Arbor, MI
Hey-Hey!!!,
I have not read the article in question. I do use the general topology quite extensively in one form or another.

Make sure the provided math accounts for the plate Z of the driver tube. The plate resistance forms a voltage divider and the NFB amount is reduced.

Pentode drivers are excellent choices, and for the same reason, the cascode.

One can also do away with the driver stage voltage supply speerate NFB resistor, and go to a tap on the OPTx plate winding. This is the nuts and bolts to the E-Linear topology. I enclosed a basic PP schematic.
cheers,
Douglas
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