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"SRPP" 300B Headphone Amplifier
"SRPP" 300B Headphone Amplifier
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Old 29th September 2016, 06:11 PM   #1
HappyAngel is offline HappyAngel  China
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Default "SRPP" 300B Headphone Amplifier

LOOK YOU 300B Headphone Amplifier
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Last edited by jazbo8; 1st October 2016 at 12:04 PM. Reason: terminology
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Old 30th September 2016, 05:01 AM   #2
lexx21 is offline lexx21  United States
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"SRPP" 300B Headphone Amplifier
Cool. Can we get more details ok the amp? Component values, voltages, etc....
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Old 30th September 2016, 08:28 AM   #3
Merlinb is offline Merlinb  United Kingdom
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That is not an SRPP. Diagram incorrect?
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Old 30th September 2016, 05:26 PM   #4
kevinkr is offline kevinkr  United States
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"SRPP" 300B Headphone Amplifier
As drawn it's not an SRPP - the output needs to be taken from the "cathode" (filament) of the upper tube in the pair. Also proper pushpull operation is only achieved with a specific range of load impedance.

Have you considered a white cathode follower configuration?
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Old 30th September 2016, 06:16 PM   #5
pieter t is offline pieter t  Netherlands
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Curious which headphone needs the voltage gain of this circuit...
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Old 30th September 2016, 06:23 PM   #6
HappyAngel is offline HappyAngel  China
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You are right! This is not a SRPP, just like SRPP, which is the active load, I tried the upper arm tube is connected with the output capacitance of the cathode, I found that the gain is high, but after a lot of experiments, I found the sound as in the lower arm is good, I think the main reason is because the SRPP depends on the load design, my headset 300 ohm and 300B impedance of 700 ohms, relative theory, 300B has enough ability to drive the other arm, 300B is equivalent to a resistance, equivalent to a constant current source, can broaden the frequency response. Welcome to a lot of guidance.
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Old 30th September 2016, 06:37 PM   #7
HappyAngel is offline HappyAngel  China
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Quote:
Originally Posted by pieter t View Post
Curious which headphone needs the voltage gain of this circuit...

Hehe, the general people will be curious about it, mainly for several reasons,
1.Acoustic impedance of 300B is low, without direct output transformer.
2.300B plate resistance power consumption is huge, very easy to burn, use tube instead of resistance, with the optimized circuit of this kind of structure is very wonderful.
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Old 30th September 2016, 06:45 PM   #8
HappyAngel is offline HappyAngel  China
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Quote:
Originally Posted by kevinkr View Post
As drawn it's not an SRPP - the output needs to be taken from the "cathode" (filament) of the upper tube in the pair. Also proper pushpull operation is only achieved with a specific range of load impedance.

Have you considered a white cathode follower configuration?
Not needed! , listen to a lot of music I think it is very good! It's easy to drive a 32 ohm.
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Old 30th September 2016, 07:04 PM   #9
HappyAngel is offline HappyAngel  China
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Look, this is the frequency of the output voltage value, not the specialized equipment to multimeter, we look at
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Old 1st October 2016, 06:12 AM   #10
hpeter is offline hpeter  Slovakia
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bloody overkill, i wouldn´t do this
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