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6C4C E80CC PP IT coupled
6C4C E80CC PP IT coupled
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Old 4th December 2017, 09:50 AM   #11
claudiomas is offline claudiomas  France
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thanks a lot Jazbo, very nice job
power supply look like PSU designer but
C2 its 10uF630V PIO//22uF500V JJ
snubber resistor 47Kohm its afther choke in // 470uF 450V Kemet long life
C4 its 10uF630V PIO//22uF450V pana NHG
no R3 does not exist
each OPT protect by fuse
thanks
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Old 4th December 2017, 10:12 AM   #12
6A3sUMMER is offline 6A3sUMMER  United States
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The application of the choke in post # 2 does not match the application of the choke in posts # 3, 7, and 9.
(the order of connections of the bias rectifier, choke, and capacitor are not the same).

Also, the -57V bias into 5k DCR = 11.4mA, a little more than the 10mA choke rating.

The 47uF capacitor across the 600H choke is resonant with the choke at about 1 Hz.
At 20Hz 47uF has capacitive reactance of about 169 Ohms.
That pretty much shorts out the 5K Ohm DCR that is in series with 600H that has inductive reactance of 75.4k Ohms Ohms at 20 Hz.
At higher frequencies than 20 Hz, the capacitor is even more dominant.

Last edited by 6A3sUMMER; 4th December 2017 at 10:36 AM.
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Old 4th December 2017, 10:33 AM   #13
claudiomas is offline claudiomas  France
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wellyou certainly right but this amp sound very nice and THD its very low
so please correct me if 47uF should be replaced of any other way
choke its rated 600H/10mA so for 11,4mA would be little less , 450/500 H
i do not now
but you understand way i put choke so if should be modified i can do but i keep the bias choke
so please correct me if I am wrong
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Old 4th December 2017, 10:37 AM   #14
claudiomas is offline claudiomas  France
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should say negative psu come from heathers main transformer in serie by voltage doubler so lot of current its available
output +20db =7V75/8ohm :::45Hz/20Khz -1dB and 30Hz-2db
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Last edited by claudiomas; 4th December 2017 at 10:52 AM.
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Old 4th December 2017, 10:45 AM   #15
6A3sUMMER is offline 6A3sUMMER  United States
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claudiomas,

I re-edited the post # 12.
Please re-read it with my new edits.

You have the right idea, but please compare the connections of the chokes in posts 3, 7, and 9. Then check the choke connections in post # 2.

The choke and capacitor in # 3 and #7 form a low pass filter when the ripple of the rectifier goes through the choke, then to the capacitor to ground. The junction of the choke and cap has very little ripple, which is what you connect the center tap to.

# 2 and # 9 put lots of DC current through the choke, # 3 and # 7 do not.

Connected the proper way, there is very very low current through the choke, until you increase the signal level so much that the output tube grids conduct and clip the signal.

Happy listening!

Last edited by 6A3sUMMER; 4th December 2017 at 10:51 AM.
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Old 4th December 2017, 11:07 AM   #16
matejsirk is offline matejsirk  Slovenia
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6C4C E80CC PP IT coupled
C3=10uF (R1=330 Ohm)? It is enough? In red circle.
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Old 4th December 2017, 11:14 AM   #17
jazbo8 is offline jazbo8
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6C4C E80CC PP IT coupled
@6A3sUMMER - I was wondering about that when re-drawing Claudio’s schematic... looks like one end of the DC feed choke should not be shunted to ground like the decoupling capacitor, but instead it should go to the bias supply.
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Old 4th December 2017, 11:31 AM   #18
claudiomas is offline claudiomas  France
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you see in "post 7" attached schematics rectifier go to choke "parallel" to grd not trought "serie"
zoom attached
so its 100mA choke 130ohm , lot of current
my choke its afther rectifier and filter its here for improve 6C4C stability and performances
this avoid grid current and improve stability and sound
this its wath i tink but i've not the teoretical knowlege to prove it
thats way i usually do not post schematics, i do becose somebody ask for.
like many people think Sakuma San its ignorant nonsense amp builder
i do amplifier like artist make music and i have little teoretical knowlege.
yes matejsirk C3=10uF (R1=330 Ohm)? It is enough
for my afther many different values from no cap to 470uf i prefer 10uFNP
i'm self educated tech professional repair audio and in the past TV K7 recorders tape reels radio gear
so i go to try to change this 47uF but i've not 1Hz boat oscillations any way , right now i'm testing with 10uF 100V bipolar NP
you see i do not pretend to teach nothing i just like nice tube amps
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Old 4th December 2017, 11:34 AM   #19
claudiomas is offline claudiomas  France
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Quote:
Originally Posted by jazbo8 View Post
@6A3sUMMER - I was wondering about that when re-drawing Claudio’s schematic... looks like one end of the DC feed choke should not be shunted to ground like the decoupling capacitor, but instead it should go to the bias supply.
no schematics of my amp its correct
maeby 47Uf its to be lowered i go check this
RK its 390ohm//10uF NP not 330ohm
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Last edited by claudiomas; 4th December 2017 at 11:39 AM.
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Old 4th December 2017, 11:46 AM   #20
jazbo8 is offline jazbo8
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6C4C E80CC PP IT coupled
Ok, I will update the schematic. As for the choke, are we talking about the “self BF’ (100R) in the French schematic post #7?
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