How about the 2SK182ES version? I purchased some recently because THF51 was no longer available from reputable sellers.
why not .... I'll try all tricks known to regular Greedy Boy to make it sing, both THF and 2SK182
except if Papa don't chime in , giving his recipe ....... though - even he's having zillion of them , I'm not sure did he already put them on the bench properly, considering number of projects he's working on
Here's some data on 2SK182 vs THF51S operated Common Source and
Common Drain, biased by a constant current source.
that's cheating ...... same numbers as I got
more important details , Pa?
rail, Iq , Uds?
I did some polishing work today with THF51, not yet finished .....
PSU capacitors price rises up exponentially with voltages from 63V to 100V and +
https://www.mouser.fr/Passive-Compo...4attZ1yx4atu&Rl=75hqwZer3vZ1z0wo8cZ1z0wqf2SGT
https://www.mouser.fr/Passive-Compo...4attZ1yx4atu&Rl=75hqwZer3vZ1z0wo8cZ1z0wqf2SGT
Bigger cap's for similar price if screw terminal type Aluminum Electrolytic Capacitors - Screw Terminal | Mouser
Oh Boy ...... ZM really trying to be systematic ..... twiddle deeeeee
OK , I tried what I could , some refinement both for THF51S and 2SK182ES , to squeeze what I can and know , in Singing Bush format
objectives and goals:
- do not alter schematic , just values and settings
-do not resort to higher voltages , keeping demands for caps at 75-80V bay
-both lowest THD and dominant 2nd, as must
so , what I did , in general :
THF51S - tested one proper pair (matched solely by Ugs) , to confirm similar behavior ; after that tested two more specimens furthest away bu Ugs , being on my disposal
2SK182ES - two of them tested- lowest Ugs and highest Ugs specimens I have
will break posts - one battery of test per post
manage if you can ......
OK , I tried what I could , some refinement both for THF51S and 2SK182ES , to squeeze what I can and know , in Singing Bush format
objectives and goals:
- do not alter schematic , just values and settings
-do not resort to higher voltages , keeping demands for caps at 75-80V bay
-both lowest THD and dominant 2nd, as must
so , what I did , in general :
THF51S - tested one proper pair (matched solely by Ugs) , to confirm similar behavior ; after that tested two more specimens furthest away bu Ugs , being on my disposal
2SK182ES - two of them tested- lowest Ugs and highest Ugs specimens I have
will break posts - one battery of test per post
manage if you can ......
Last edited:
THF51S , Ser. 1Z0081 , first from matched pair, 8R load
Rail 65Vdc
Iq 2A3
output node 37Vdc
Mu resistor string 6 x 0R1
output taken 02R from bottom
this one , Ugs -3V21
Rail 65Vdc
Iq 2A3
output node 37Vdc
Mu resistor string 6 x 0R1
output taken 02R from bottom
this one , Ugs -3V21
Attachments
Last edited:
THF51S , Ser. 1Z0081 , first from matched pair, 4R load
same conditions
again , this one , Ugs -3V21
same conditions
again , this one , Ugs -3V21
Attachments
Last edited:
THF51S , Ser. 1Z0115 , second from matched pair, 8R load
same condition
this one , Ugs -3V22
same condition
this one , Ugs -3V22
Attachments
THF51S , Ser. 1Z0115 , second from matched pair, 4R load
same condition
again, this one , Ugs -3V22
same condition
again, this one , Ugs -3V22
Attachments
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