one Canuck is blind , same as Moi
second one is not
post #3 , pic repeated here , specially for blind and lazy ones
you'll see them populated, little later ....... supper time
second one is not
post #3 , pic repeated here , specially for blind and lazy ones
you'll see them populated, little later ....... supper time
one Canuck is blind , same as Moi
second one is not
Guilty as charged 😎
Just so you know MZM, I bought a hot air rework station because of you. Inspired by you of course and also because it was inexpensive and looked like a good idea at the time ...
as I promised (to my self , in first place ) , today I did change pair of 2SK170BL in input LTP position , for 2+2 pcs of 2SK2145BL
previous idea was to up LTP current from 10mA to 20mA , resulting in healthy 50mW per tiny bugger , but later decided to try Papa's approach , of doubling input JFets , while Iq keeping at same level as for single pair
that way - due to increased combined xconductance , OLG is rising , and without change of NFB network , NFB is rising , so we can expect lower level of THD
is it good thing or not - sound wise , who cares ...... I have all the time left to humanity to try that ...... later
previous idea was to up LTP current from 10mA to 20mA , resulting in healthy 50mW per tiny bugger , but later decided to try Papa's approach , of doubling input JFets , while Iq keeping at same level as for single pair
that way - due to increased combined xconductance , OLG is rising , and without change of NFB network , NFB is rising , so we can expect lower level of THD
is it good thing or not - sound wise , who cares ...... I have all the time left to humanity to try that ...... later
Attachments
now the real stuff ...... I mean - hard data
(observe how I finally switched two cells On , so removed confusing unnecessary part of graph 🙂 )
each graph is having title in bottom
so , THD indeed goes down , comparing to yesterdays measurements , with pair of Toshiba 2SK170BL in FE
load 8R
(observe how I finally switched two cells On , so removed confusing unnecessary part of graph 🙂 )
each graph is having title in bottom
so , THD indeed goes down , comparing to yesterdays measurements , with pair of Toshiba 2SK170BL in FE
load 8R
Attachments
having some time before actually being forced to sleep
it's interesting to put them (graphs) side by side and compare
so , left is FE with pair of 2SK170BL , right is FE with double pair of 2SK2145BL
LTP Iq 10mA in both cases
1W@8R
it's interesting to put them (graphs) side by side and compare
so , left is FE with pair of 2SK170BL , right is FE with double pair of 2SK2145BL
LTP Iq 10mA in both cases
1W@8R
Attachments
