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is "Input" and outside is "Output".next is indicated detail.
If do you would like study more something about an amplifier.
please see "Stagger Ratio"for An Amplifier design.
Not only 300B triode even penthode like KT88
have to adjust C(coupling) and R(leak resistanse)under SPEC of
TUBES.most important thing is" how is sound with your speaker system
and your room where you are always listen faber MUSIC."at least
you need know DF(Damping Factor)of Penthode is very low.like 0.5
but Triode (low mu like a 10 from 3)are around 2-3.Direct heating
Triode (45,2A3,50, 300B ,275,VT52 etc) are useble as a NON NFB
SE Amplifier.but Penthode are not.Penthode need NFB or 2nd Way.
"UL is kind of technic of NFB" and UL get around 6 from 3dB
of NFB into final tube and closely same effect of cathode negative
feed back at output tubes cathode.I always feel good -3dB with
many Valube Amplifier with high effiency speaker(over 90dB/m/w).
and always I asked many person how much did you get DF your
Amplifier D.I.Y? if some one said DF=1 . I said OK bad amplifier
did you built up.Power Amplifier are not power.Power amplifier has
Good DF.push pull get around DF=10 and SE get around 2-3.
An Amplifier SE D.I.Y has good DF at least 2-3.can move yor JBL and if
would like to use SRPP for Drive ,output impedance is very low but gain
is not enough for power tubes so you can caluculate gain for SRPP drive
to set up your power tubes ,please see for some idea more gain of SRPP
click here .ex) ECC83 if use , cathode resistance are around 1k ohm to 2.5k generally
but some time need more output gain.please to try to use value of from 2.5K to 5K ohm.
Note: Russian 6550 and KT88 are almost same cahactor.I think same tube.
if driver can get max 40V rms , can be use any drive amplifier like P-G amplifier by 12AU7
ECC88 etc of one driver.KT88 sound is very similar of good triode amplifier.
but EL156,KT90,KT120 are almost same kind of sound.not get mid high is clear.
KT88 single ended amplifier is just like good triode amplifier sound and good bass.
charactor is just same sound of EL34 but more powerfull.off course depend on good
transformer use.transforemr is at least need 10(20Hz) to 100Khz(80Kz) bandwith.
10 W rms power so need more than 20W capability of power.so KT88 single ended Amplifier
very popular for Audiophiler.KT90 is not same family of sound of KT88.KT90 is
PL509(top plate) Sweep tubes modificated.sound is very tight and dry.for me
not recommended to use audio amplifier.EL156 China is not bad and easily to drive
any kind of drive amplifier ,just a half of 6DJ8,12AU7 enough to drive.
whay can I say,,,,KT88 is the king of valves.looks good ,sound good, easily to drive.
other way Triode Single Ended Amplifier get sound of other world of sound.
Not only power.
DF is very important and output impedance
explane for DF ,please move mouse on the Icon.
Fujii New Tech Amplifier for EL34/KT88 Single Ended Amplifier
Idea from most 2/3 multipul charactor amplifier and 3/2 multipul
charactor of Diode tube.good factor for Penthode SE Amplifier.
Mr Fujii said you can build up one of very low distortion
Penthode SE Amplifier like a push pull effect.what do you think?
Distortion is 1/20 time less than general penthode SE Amplifier.
above picture came from,if would like to see!!
Idea of Grounding point in the chassis
to Click and it's is not only this way to made up good one of amplifier.and very
important things is ground wirering when would like to build up an amplifier.we call It's
"ONE POINT EARTH".(Itten earth).very important for any kind of Amplifiers.any Kind of Audio Amplifier even High End Audio Amplifier like a Jeff Rowland, Sony too.