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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
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