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6SN7 Mu follower or cathode follower?
6SN7 Mu follower or cathode follower?
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Old 8th November 2019, 01:55 PM   #21
rhythmsandy is offline rhythmsandy
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6SN7 Mu follower or cathode follower?
Im using the following. The B+ gnd is connected to the signal ground which is not mentioned in the pcb.
Attached Images
File Type: png mu.PNG (31.7 KB, 300 views)
File Type: png mu sch.PNG (58.1 KB, 301 views)
File Type: png mu_pcb.PNG (63.6 KB, 266 views)
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Old 9th November 2019, 01:04 PM   #22
N101N is online now N101N
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The mu follower is associated with high distortion. If distortion matters you should adopt the circuit in post #4.
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Old 9th November 2019, 01:17 PM   #23
rongon is offline rongon  United States
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6SN7 Mu follower or cathode follower?
That's odd. Everywhere I've seen, the mu follower is associated with *low* distortion (and comes close to achieving gain equal to the mu of the tube, hence its name).
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Old 9th November 2019, 02:32 PM   #24
rhythmsandy is offline rhythmsandy
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6SN7 Mu follower or cathode follower?
Can anyone tell me anything wrong in the above PCB layout?
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Old 9th November 2019, 02:37 PM   #25
Lingwendil is offline Lingwendil  United States
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Quote:
Originally Posted by N101N View Post
The mu follower is associated with high distortion. If distortion matters you should adopt the circuit in post #4.
By who? The mu follower is a very low distortion gain topology when implemented correctly, and it is rather easy to do right. What testing have you found to the contrary?
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Old 9th November 2019, 02:42 PM   #26
rongon is offline rongon  United States
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6SN7 Mu follower or cathode follower?
Quote:
Originally Posted by rhythmsandy View Post
Can anyone tell me anything wrong in the above PCB layout?
Can you post which specific schematic is the basis for that specific PCB layout, with corresponding parts reference numbers shown? (R1, C3, etc.)
--
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Old 9th November 2019, 02:48 PM   #27
Diabolical Artificer is offline Diabolical Artificer  United Kingdom
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I'd sort your power supply out before you do anything. Find a suitable load and scope it. Nailing the hum issue should be first priority.

Andy.
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Old 9th November 2019, 03:39 PM   #28
baudouin0 is offline baudouin0
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The other option is the bootstrap follower. You feed the output of the cathode follower through a cap back to a split anode load resistor. Advantage low distortion and rejection of the HT supply.
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Old 9th November 2019, 04:05 PM   #29
rhythmsandy is offline rhythmsandy
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6SN7 Mu follower or cathode follower?
Quote:
Originally Posted by rongon View Post
Can you post which specific schematic is the basis for that specific PCB layout, with corresponding parts reference numbers shown? (R1, C3, etc.)
--
schematic attached
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File Type: png mu sch.PNG (58.1 KB, 208 views)
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Old 9th November 2019, 04:07 PM   #30
rhythmsandy is offline rhythmsandy
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6SN7 Mu follower or cathode follower?
Quote:
Originally Posted by Diabolical Artificer View Post
I'd sort your power supply out before you do anything. Find a suitable load and scope it. Nailing the hum issue should be first priority.

Andy.
Im using single bridge 5010 followed by CLC 220uF/450V , 2H , 220uF/450V 470k shunt at the output.

Two AC terminals for the heater supply is joined via two resistors each 100ohm and the joint of the two resistors connected to the power ground.
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