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Tango,Hashimoto(Sansui)and Tamura.even some small transformar factory made too.
please see first frequency response of Transformar if did you get.it's not price
of transformar.some cheap transformar made good and sometime very famouse transformar
does not have good curve.meanning no use for Single Ende Transformar.be carefully
to use SE transformar.
one thing KT88/6550 Load Impedance is depend on high voltage low current
or high current low voltages.so 2 type of impedance.this is not only KT88/6550
valves low and depend on typical amplification mode like a Class A, Classs AB
etc. some one would like to use 2.5K so should be use high current and low voltgae
for plate.some one would like to use triode mode, should be use 3.5K or more
(like a 5K load)and voltages is high ,current is low.so G1 bias is high.thoes
things are depend on what kind of amplifier would like to build.
and size of Single Ended transformer is twice(or more)size of Push Pull
Transformer,so if 10W SE transformers core can make 20W push pull transformer.
small transformer never can get good low response depend on Material of core.
If do you have interesting more "study" for load impedance please see
study site like a please see it's**
Very good "Study" Site from "Valve Wizard from UK"
How can I use valve for Amplifier
How to use all about valves
How to caluclate Power and self Bias ?
ex) EL34 how to caluclate Power,distortion and Self bias
so how to caluclate EL34 ,bias and power.
first pluease seek EP-IP charactor curve where get from some data site
like Duncan,K7 site for valves.
just exsample is for EL34.B+ is 350V ,Ib=72mA .point of S is -26V passing 3.5K
load resistance .point A is Ec and 0V, S is point of bias and point of B is
-26V X 2 so -52V lower side.always need charactor curve for calclate
value of valves.we always decided to calclate proper value when start build up
an amplifier.any valves can use any load impedance but have to caluclate each
time. Peak power get when grid reach 26V peak.so RMS value is 26V/1.414= 18.4V rms
so you need 18.4V rms signal into control grid.cathode bias resistance is
Rc = 26V/72mA= 361 ohm. wattage is 1.8W , you have to seek some 5W resistance
for safty.many time use cathode resistance are 390 ohm and +B is around 360V.
when are you would like to work as EL34 triode connection.triode connection
means many time use load impedance is around 3.5K ohm.so you can caluclate
easy for penthode condition.but one thing very importat is audio transformer
is enough to use for Single Ended Amplifier.which do you have.
Try
again built up KT 88 single
ended
amplifier on 24th May 2004
this time use
Tango MX-205
power transfomer.max rate is 210mA current
capacity.and plate
voltage are
320V.cathode resitance are 272ohms.
272 ohm slightly
higher than
normal.i selected this value for compatibilty
of EL 34.so you
never use EL 34
,shuold be 150 ohm for cathode
resistance for
6550 and KT 88
better.
I got around 25V
so current are
some 90mA include G2 current.
I never know 6550
and KT 88 are
different charactor.sound like EL 34
but 6550 is just
like a 6L6GC but more potencial.
KT 88 's high frequency
response are very nice and sound like a
EL 34 .this time I
took off 500K 18K and 0.1uF networks.and does not
have over all NFB.only use UL
connection.UL is some kind of NFB as you
know about it.
around -3dB NFB ,could be get on final stage.but slightly
bright sound I
got.so heve to give some over all negative feedback around
from 3 - 6 dB for good
DF(3).Rf is
2.6K .
OUT PUT
Transformer are small
economic model.
OPT-10S USD $ 33
(Toei Trans Co
Japan )
SRPP
: 500K , 18K and 0.1uF network(u(mew)Drive is not necesary if you can get
suffucient power from power
tubes.so you can take off these components.Rf is need to adjust with
AC dB meter respect with DF (damping factor
) of your speaker system..I guess 3 stages or 2stage p-k reguler
amplifier are better
for enough to get power.such as a triode -cathode follower and final
stage is best choise of
amplifier.and get powerful sound.even i got very powerfull sound.
heater bias needed for
SRPP stage for protect cathode of driver tubes .
Choke coil is 5H
200mA .
Input capacitor are no exceed to 47uF 500V.so max is 47uF for 5U4G
for protect 5U4G
rectifier tube.more than 47uF get damege of rectifier tubes.
please see 5U4G spec.
some bypass condensor are MUSE
condenser and Black Gate.and coupling
are film capacitor
and Vita Q in parallel.Vita-Q get more natural sound.
sience 8th Mar 2004 from
Japan.K.M
*this parts Update 26th Nov 2005 K.M*
This picture is EL34 and 6B4G
(same like 2A3 but 6.3 filament direct heating valve)
on 26th Nov 2005
with switch +B 320V to +280V and filament voltege is trough rectifire
bridge some condensor into filament or heater of EL34.
same US Octal Base you can use both way indirect and direct heating tubes.
I got 4.5 W output when I used 6B4G Single Ended mode.sound like small
300B sound and very clear.felt
much power than EL34 SE .however half power of EL34 SE.
6B4G and EL 34 Compatible
Amplifier ( 6B4G and EL34 are same US(octal)BASE used)
Circuit diagram is next.
How about will you replace resistance in your an Amplifier
Do you know ? material of resistor change sound ?
actually we can use 2 type of film resistance for Audio circuit recently.
(A) Carbon film resistance
these are film carbon resistance
Charactor: sound is very clear low to high frequency and feel sound is clear and good
for pre-amplifier or flat amplifier.
famous resistance are "Allen & Bradley carbon solid resistance" "AMRG" "Rikenorm Riken RMG" "AMRS"
"Rikenorm Riken RMA" "Taiyo FTR" "Rikyu RD-25TJ" "Takman REX resistance" etc etc
(B) Metal film resistance
and this is Metal film resistance RSN1S TDO resistance
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
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.
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