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Old 18th July 2014, 11:32 AM   #1
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Default 6B4G and ECC83

hello everyone!
I am wondering if I can substitute one ECC83 with two 75 tube in the next schema
kind regards!
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Old 18th July 2014, 01:01 PM   #2
DF96 is offline DF96  England
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Probably, yes. But why?
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Old 18th July 2014, 02:54 PM   #3
316a is offline 316a  England
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I don't understand people using ECC83 with directly heated triodes . I have built a few such as the Shishido 2A3 and was never happy with the sound . Better off with an ECC81 , ECC85 or 5965 for high mu drivers . These have much lower Ra and should be able to drive the 6B4G grid nearer to 0V so more output power available . Expect around 2 watts with an ECC83 and 6B4G and nearly double that with a <10k Ra driver . Then there is also the ECC83's ability to drive the miller capacitance , which will limit the HF and may lose a few dB at 20kHz (which is audiable) , hence the reason why SRPP has been chosen in the design

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Old 18th July 2014, 03:04 PM   #4
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Yes I agree, the ECC83 can provide the voltage swing but the current isn't there. The more current the better the slew rate.
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Old 18th July 2014, 03:58 PM   #5
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I want to build a amplifier with 6s4s and 75, a friend told me that 75 it is equivalent with ecc83. Can anyone recommend me a schema? Thank you!
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Old 18th July 2014, 04:10 PM   #6
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ECC83 is, IMO, not good choice for driver for 6S4S for good sounding. Better use E180F, 6J9P /6Ж9П/, 6J11P /6Ж11П/ Russia.
Projects: OTL-OCL 6AS7 Gen. Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, E84L Siemens, E236L Telefunken, headphone ampl. OTL Loftin White 6AS7 RCA,... PPs 6005 Gen. Electric, EL34 Mullard, 6L6....
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Old 18th July 2014, 04:21 PM   #7
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To me it looks like a schematic for an EL34 amp that (for commercial reasons) accepts an octal base DHT as well.
You can try this design and if the driver isn't powerful enough change to a stronger valve (likely less gain) or insert a mosfet source follower.
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Old 18th July 2014, 06:04 PM   #8
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Originally Posted by DF96 View Post
Probably, yes. But why?
I want to be a retro style amplifier, I like how it look 75. Other variant it is with 76 ant 6SN7 driver. Any comment?
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Last edited by klauss00; 18th July 2014 at 06:08 PM.
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Old 18th July 2014, 08:59 PM   #9
hooman is offline hooman  Iran
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