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6C4C E80CC PP IT coupled
6C4C E80CC PP IT coupled
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Old 4th December 2017, 12:24 PM   #21
claudiomas is offline claudiomas  France
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Quote:
Originally Posted by jazbo8 View Post
Ok, I will update the schematic. As for the choke, are we talking about the “self BF’ (100R) in the French schematic post #7?
Jazbo,
please correct input grid go to 100K log center pot only
RK 390ohm
but the self from -57V to grd its correct, itl like this ,
600H 10mA choke cost 60 euro , its here to improve sound ans stability
electrons inside 6C4C hare very happy like this
if 6A3summer give my better combination of capacitor value,OK,
but still this choke go from -57V5 to GRD .
i can put low value resistor in serie to limit current to 10mA,
lower the capacitor 47uF//, we see this lather on
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Old 4th December 2017, 01:03 PM   #22
claudiomas is offline claudiomas  France
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so i go try few days and remake measurements with 1Kohm in serie to the choke
to limit current to less of 10mA
attached temporary schematics
Attached Images
File Type: jpg bias choke.JPG (213.1 KB, 112 views)
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Old 4th December 2017, 03:30 PM   #23
jazbo8 is offline jazbo8
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6C4C E80CC PP IT coupled
Updated schematic:

Screenshot - 12_4_2017 , 4_29_39 PM.png
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Old 4th December 2017, 08:19 PM   #24
claudiomas is offline claudiomas  France
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well i have to thanks Jazbo and 6A3summer
the capacitor // bias choke replaced by 10uF100VNP , it was 47uF.
so now the quasi inexistent noise its completely silent,
from -80db to -90db,
so i guess this its improvement.
again thanks.
attached modification and measure
Attached Images
File Type: jpg bias choke0001.JPG (216.5 KB, 95 views)
File Type: jpg UP300_bias choke 10mA.jpg (70.2 KB, 90 views)
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Old 4th December 2017, 10:47 PM   #25
6A3sUMMER is offline 6A3sUMMER  United States
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C3 10uF, R1 390 Ohm, the ones that are circled (2nd stage).

The capacitance is a little too low.
Xc = 390 Ohm at 40.8 Hz, too high of a frequency for a hi fi, maybe ok for a guitar amp.
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Old 5th December 2017, 08:00 AM   #26
claudiomas is offline claudiomas  France
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Quote:
Originally Posted by 6A3sUMMER View Post
C3 10uF, R1 390 Ohm, the ones that are circled (2nd stage).

The capacitance is a little too low.
Xc = 390 Ohm at 40.8 Hz, too high of a frequency for a hi fi, maybe ok for a guitar amp.
yes its for guitar, speaker celestion vintage30 and 12AX7 china 220K Ra and 2K2 cathode, 100K+100nF to volume pot and go **** rock and roll
many others guitar amps :100 Amplifiers, part 2 , 1945 – 54 | Lilienthal Engineering
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Last edited by claudiomas; 5th December 2017 at 08:11 AM.
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Old 5th December 2017, 09:06 AM   #27
jazbo8 is offline jazbo8
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6C4C E80CC PP IT coupled
Got to be one of the most unique guitar amps around!
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Old 5th December 2017, 09:19 AM   #28
claudiomas is offline claudiomas  France
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6A3summer,
right low end can by linear but its not the cathode capacitor on differential stage to improve, the amplifier its open on my bench, no cap, or cap 10uF or 100uF the difference its only gain , and 10uF its perfect for the sound.
if you want boom boom a 20Hz should improve the cap on first SRPP stage,
i just do and lineariti improve from 20Hz.
sweep by 100uF ans 10uF attached
Attached Images
File Type: jpg 10uF SRPP.jpg (205.2 KB, 70 views)
File Type: jpg 100uF SRPP.jpg (181.9 KB, 69 views)
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Old 5th December 2017, 09:27 AM   #29
claudiomas is offline claudiomas  France
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if come back to my hand made schematics you can see the value of this cap was changed, a sticker cover the original value.
i do not like the """sound of caps"" but the sound of tubes
so everybody can do how like
Attached Images
File Type: jpg correction.jpg (38.0 KB, 11 views)
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Old 5th December 2017, 09:41 AM   #30
claudiomas is offline claudiomas  France
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i'm sorry Jazbo but i forget 3 resistors neededs for stability and linearity
on primary LL1540 and secondary LL1660
Attached Images
File Type: jpg resistors.JPG (463.9 KB, 34 views)
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