6550/KT88(UL or Triode) Single Ended is good but EL156 is King
Single Ended Amplifier is use only Class A
for enjoy any music if you have good speaker system and C/P is good than 300B SE,valve are low
cost than 300B's.but speaker system need at least 91dB/m/w.and wide range speaker like B&W, Klipschetc.
KT88 and 6550 are almost same charactor so you can use each other same amplifier.
but some bias adj.KT88 are not same sound getting if Maker is different.please try it's.
Any Penthodo grid bias are less than Triodo's bias so please try to use any kind of driver.
which is SRPP, one tube triode like 12AX7(ECC83),6DJ8, one of the penthodo drive by EF86,6SH7,any .
impedance are 3.5K ohm if using high voltage for plate voltages.cathode resistance are
around 390 ohm 10W ~ 20W.just try to drive any kind of driver by UL and wired Triodo.
Europian Tubes bias are almost a half of KT88,EL34,6L6GC 's bias
Link to EL156/KT88 and KT90 SE and KT120 Single----->>
The Real Audiophile does not care about small power when one is using
Single Ended Amplifier.
2nd harmonic makes different tone,depend on how fixed driver valve.(PP does not have 2nd Harmonic.)
Power of Single Ended Amplifier
is depend on capacity of Audio Out Put Transformer and Power supply.
They are supporting Single Ended Dot Com
Why use Single Ended Amplifier ?
Single Ended Valve Triode Amplifier has not same tone with Push Psu Amplifier.
over 90% persent of Amplifiers are push pull,and push pull amplifier does not 2nd harmonic and off course
does not get 2nd 4th, 6th harmonic.vs SE has 2nd , 4th, 6th harmonic.Push pull has minor distortion than
SE Amplifier.2nd harmonic is make good tone for Music.not too much and not less than.feel good sound get
from Single Ended Amplifiers with high effency speakers from 88dB/m to 100dB/m.I means Single Ended Amplifier
is almost Single Ended Triode Amplifier.or Penthode but wired Triode. Tone is Different.good for Jazz and
small room Classic(Trio,Quartetto,etc.)
if do you have a good efficient speakers( like a over 91dB/m/w),you may use a 2A3SE(6B4G).
and 2A3 SE is most good amplifier than any kind of Hi End Amplifier .I live small
apartment so good enough to use 2A3 SE with Tango XE-20S Transformer.but lets me show
you KT88/6550/EL34/KT77/ Compatible Single Ended Amplifier.twice of power of 2A3 SE.
I guess depend on 6550's plate current made up good sound than 300B SE.300B SE is
get good sound but depend on output transformer and plate voltages.many 300B SE does't
get "real 300B tone's" even power does't reach 8W rms and frequency response are narrow.
Let's buildding up 6550/KT88 SE Amplifier D.I.Y
Important:
One of famouse Valve Amplifier MFG.Spec said 300B Single Ended Amplifier has 8W rms so on
but real is 6.5 W rms.useable power is 6 W rms.you must know.
other way 2A3 SE with Tango,Tamura Transformer.can get easly 5 W rms power.valve cost es a
half of 300B Russia,China.which is good for you.
Audio Transformer:
Valve Amplifier is ,depend on quality of audio transformer.
which is better for Valve Amplifier ? Japanese Transformer are best for use.
Tango and Tamura ,and Hashimoto(Sansui) are best. I prefer to use ISO Tango for
reasonble charactor and price.Tamura is very best but many Tamura Transformer are
super expensive.Hashimoto are good too and reasonable price.
I do not recomend use James because quality is not high.even they said ,Japanese
Iron using but charactor is not so good.Inter stage Transformer is Tamura and ISO Tamgo
and Hashimoto. recently many DiYer using Lundahl Transformers for impedance matching
transformer and interstage transformer.
6N1P SRPP with Fluency Wide Band DAC This Site wrote my poor english and very
Bad ,but this WEB site is not English program site. make sure please
under stand "really what are you would like to KNOW ? " .
Thanks
Lagarto san from Sakura Chiba Japan
if do you have interesting on 2A3 and 45 SE make click next
Easy drive by 2A3/45 Single Ebded Amplifier Dr Joaquin Chile 2010 Apr
2A3/45 SE
New 2A3/45 Compatible SE
KT88 Single Ended Amplifier brand new on Sep 2011
Mr Tim Williams Plan of KT88 Single Ended Amplifier D.I.Y Step by Step from Australia
Sckematic showing
next very simple
circuit .DF is 2.5 ��depend on NFB EL 34 got power around 8 W to 9.5
W and KT88 is just like same power. 8.5 W and max power
is 10 W.may be
10W power get feel like destortion I am using cheap out put transformer
but sound like
very great.may be good for Cuerda like a chello.this is UL connection. this time use small
size power
transformer 320-0-320 and 180mA .so is not enough to get high power of
6550(KT 88).if you are obtain good 20W -30W output transformer for this amplifier. and good high
capacity of transformer such as 350-420V DC ,280mA DC. probably you may get
more than 15W rms at 6550/KT88 .this time i got 80mA at KT 88 cathode. should be choose 390 ohm
( correct cathode resistanse or fix bias use under negative power supply)
and plate voltage is around 370 - 420 volts better.meanning around plate current are more than 105mA
.when if you would like to get big power, necesary 2 stage driver.this srpp circuit is not
enough to drive high voltages condition.Power
tubes can be use EL34 ,
KT88 , 6L6GC instead of 6550.I will say sound of EL 34 Telefunken is beautiful sound
you can get and EL34 Svetrana too. coupling capacitor are ASC for KT88,
Vita Q for EL34 or any kind of oil capacitor and one thing SE ,
any SE are around 30%--35%(some time 25%) efficient from max dissipation
original tubes. depend on Auido out put Transformar and power supply
are good one.many old japanese builder choose 2 time capacity of transformer
so if would you like to get some 10W power out put. you need 20W output
transformer.It's Class A SE Amplifier.
And let's me tell you about minor distortion of amplifier.we call it's
"Cancel of distortion"from driver tube.if driver tube does not have any
distortion ,will be get major distortion out put stage if are using single
ended Amplifier.it's meanning diver tubes must be made up some distortion
for cancelation of distotion ofoutput tube(ex KT88 etc).any voltage tube amplifier
has 2/3 zone charactor.so startting position are always get non lineal distortion.what
meanning if you are using one of triode amplifier for driver .necesaly to adjust
load resistor for minor distortion of OUT PUT stage.please under stand,
driver tube is very important. if driver has good charactor does not
make good result on output stage minor distortion.so with your ear or connect
distortion meter with your amplifier then adjudt value of load resitor of driver.
if choose SRPP for driver . It is difficult adjust distortion at driver stage.
point of how to change sound: 1st decoupling of cathode capacitor are
using good Audio Capacitor like a MUSE NICHICON , Black Gate etc.
sometime use one of LED(Light Emitting Diode)instead of RC network.
please try to use LED decoupling element for 1st stage of cathode .
explane for Distortion ,please move mouse on the Icon.
Circuit is next.
this circuit is not original SRPP.we call it's "u(mew) follower for a little
more Gain than SRPP normal.
Diode are Kick Back Diode Diode: diode has
some effect ,some one call it's "Kick Back diode".protect
voltage
from your speaker.diode makes cancel voltage from voice coil.
please
try "connect diode "or "with out diode".with diode makes much power and
good response of low range.
and
you can hear something more ??.believe it's? if would like to test how
to function please try to use good diode some of over 20A diode is best.
some time say,Kick Back diode called as stopping diode,this diode can be use
any kind of rectifier diode.voice coil is shown above as L1 and this inductance
produce small voltage when speaker cone is moving,just like same kind of SW( Standing Wave)in RF circuit
signal is
going back from voice coil of your speaker system.so sounding and Df are a little
bit down with normal sound.D2 is old technic with RF power circuit.same kind of
Basically Fujii Amplifier technic.kind of D2 is best to use as same valves of Power tube
connected wired diode and get miner distortion than without D2 diode.
Just try !!! connected one diode on screen grid.you can get sound good.
Diode 2: Many peroson believe direct heating Rectifier tube
make different sound with
tube amplifier.
5V4G and 5Y3 if using , each tube has different charactor ,sound is very
different.
if your transformer has filament voltage please try to use Rectifier
tube like a 5U4G
if you do not enough voltage for 5AR4 Plate is better for use.274B
Golden Dragon is good when
I use the Rectifier tube for power supply.274B
Golden
Dragonis sound very nice bass.
even 5V4G too.if you can get easy 274B
Western Electric much better but very
expensive.
Rectifier tube has 3/2 charactor into your Amplifier.
KT88 Single Ended what kind of OUT PUT Transformer need ? In generally,KT88 SE 10 W means around 15 W(min)capability of Audio transformer
needed and power transformer is at least 170mA 420V from 360V for UL and Triode
connection or bigger.if would like to get more than 10W rms like a 15Wrms
at KT88 SE necesary 20W power output transformer.power transformer is around
250mA DC and Volatege is from 360V to 420V DC.impedance are form 2.5K to 3.5Kohm.
depend on connection mode.10W transformer means appx 8W rms max power.many Japanese
""hobbyst said 2 times out put power transformer use for single ended amplifier.""
and which is better with gap and without gap.with gap is very prety sound high range.
but with out gap is very low side are good.without gap transformer need some
compensation of high frequency range.with RC network etc.Valuve amplifier are depend
on Audio OUT PUT transformer.many people said "size of core".and should be use
Sandwich Wounded.
Most important thing:
If do you have good audio SE transformer with UL. please check frequency response with some
audio generator and AC mili meter.if did you get some ripple odd curve
on around from 40Khz to 60Khz frequency range means not good use for UL connection.
UL connection Amplifier will be oscilated some high frequency with all over NFB.
be carefull to use Single Ended Transformar.if transformar does not have a ripple and
ripple are over 100Khz. does not matter. but many audio transformar has ripple.be care full!!
even OPT-10S has ripple 40-60Khz zone.not good for UL penthode Amplifier with NFB. most 2 type of Transformar .one of EI core general and EI with gap U-808 ,XE-20S and many Tango's transformar are with gap and EI core.but some
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