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Charactor: Sound is good low ranges and good high range . if your amplifier does not get good low(Good Bass).
please try to replace of all resistance of Metal film resistance. You will be get good Bass and high frequency
tone. famous resistance are "KOA metal film MOS1/2C " "Vishay Metal film Z201" "Skelton Fukushima-Furaba"
"TDO, Solist or Takman Metal film" "Vishay MBB0207-50F" "AMRA" "Rikyu RO-25CFK"
"Vishay RN65D" "Takman RLF" "Tokyo Koon denpa RD" "Nikkohm solid resistance RP" "Alfa Electronics FLCX"
"Vishay VSR" "Takman REY" etc etc.

so recently I like sound of "Takman REY" and "Takman RSN1S" to get good bass from
my single ended Amplifiers.Nikkohm RP are good too.

Takman Resistance Co Japan




Nikkohm Matal Resistanceuse for High End Audio and RF


so Resistance change sound of your Amplifiers.
probably the carbon resitance are good for pre-amplifier and some parts in power supply circuit.
how about you ? please try to use different resistance into your amplifier D.I.Y
                             
Another option is 300B Single Ended Amplifier


                                       Picture is 300B Single Ended Amplifier




300B Amplifier with SRPP on march 2006

What is Bias ? for EL34


Bias is , if do you speak english ? automatically knows about what is bias.
bias is A divide by B , A is Ip current , B is Ep current.
some one said which is correct bias for EL34 etc. I said that correct bias voltage
does not have.so it's is depend on what kind of transformer do you have? and
what kind of connection do you would like to use and depend on what kind of power
suppuly use.if would like to use high voltage like a 420V. plate current should be
chooese low.and out put impedance is high.if would like to use UL or triode connection
bias is high voltage, low current and impedance is high like from 5K to 3.5K ohm.
if would like to use low voltage like a 250V. must be use high current for plate.
and depend on type of Amplification as A , AB1 etc. single-ended means Class A.some
time use class A+A2 etc.disspation EL34 is 25W so you have to use less than 25W .
caluculate Ep X Ip .ex) -26V Eb 350V Zp= 3.5K 26V X 1/√2= 26 X 0.707= 18.4 V rms
26/70mA = 370 ohm.if you are using auto bias. you are use 370 ohm.these value is
depend on 3.5K ohm line on Ep-Ip curve of EL34.70mA means, Max is 130mA needed
plate current.3.5K ohm is triode connection.in generally use 2.5K ohm for penthode.
which impedance you would like to use is first then I can know about bias, Ep and Ip.
easy to caluculate if you can get Ep - Ip curve for each tube.A1 triode is 370 ohm
for cathode.Ep is 375V.Rl is 3K, 250V ,-14V for Eg and cathode is 14/0.07 = 200 ohm.
same way if use 2K imp and -13.5 V for Eg then 13.5/0.1 = 135 ohm.
Bias for EL34 is depend on your mind.your favorite sound.in generally EL 34 plays
2.5K load and G1 Bias is around -13.5 to -14.5 V Ip is 80mA 175ohm for cathode.
when plate voltages is 250V.will be get sound like grave.and POWER is around 10W.but
10W rms with EL34 is critical.10W EL34 is depend on your Transformer.small one get
small power.disspation is 25W so if choose 100mA Ip and you must be use plate voltage
is less than 300V.must be use 250V for plate.and if would like to triode connection
Rk is 390 ohm and plate voltages are some 370V.automatically load impedance is 3.5Kohm.
sound is each other different."GB multiplication is always iqual(same)."

About coupling capacitor , please choose proper value for roll off frequency and in circuit you can see 0.33uF 630V of C and leak resistance of 300B is 100K to 300K R you can caluculate how fx= 1 / 2x3.14 x CR = 159 / C(uF)x R(K ohm) ex) fx= 159/ 0.33x 220 = 2.19 Hz.roll off frequency.so first you need look how much at least need 300B grid leak resistance and please caluculate proper value of C and R are very important.and SRPP gain is depend on from 1K ohm to 10K ohm to replace load resistance.sound is depend on you like which are choose coupling capacitor and leak resistance if you do you have some high value inductance some more than 400H .for grid choke when are you would like to use 300B , 6B4G etc.

Film Capacitor has direction

any film capacitor has direction .film cap made up inside to outside.inside of core
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.




ProAc 110 with KT88 SE in Spanish
Yamaha NS 300 and Amplifiers


above picture came from,if would like to see!!





Proto Type 6550/KT88 SE Amplifier and Most Latest Model is

Idea of Grounding point in the chassis


Let's me show you some example here
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.


only links



Mr Claude Paillard F2FO Tubes Manufacture from France

Mr Claude Paillard and his web site. you can see how to make valves
specilly he is doing making Triode on his web site.please see It's
His WEBHere






Turner Audio 6550's 300W rms Australian Amplifier