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dobiejoe 13th January 2013 03:05 AM

6n11 tube headphone amp
6n11 tube headphone amp. No sound from one side. Both main power chips are 24V and heater amps are putting out 6.9V. Any help would be great. I am thinking the main verable reisiter and I should upgrade all the resisters to 1% metal.
The numbers with input being used, no output,
pin 1 200mv with steady rise in MV range only
pin 2, 22MV
pin 3, 200MV
pin 4, 6.9V
pin 5, 36MV
pin 6, 12.06V
pin 7, 20MV
pin 8, 380MV
pin 9, 0V

Any Idea's? :)

merlin el mago 13th January 2013 09:29 AM

6N11 tube is the Chinese equivalent of ECC88 pin 1 & 6 are the anodes/plates so both tubes must have the same voltage so seems don't arrive B+ to pin 1 check the track if there is a burned resistor or the track have a break.

Do you have the schematic?

orion rob 13th January 2013 06:36 PM

Bravo 12AU7 Mods and Appreciation thread

merlin el mago 13th January 2013 07:34 PM


Originally Posted by orion rob (

I'm not member, I can't see nothing.

dobiejoe 19th January 2013 01:09 PM

I replaced all the reisiters with new 1/4W 1% metal film and still no output from the left side. Both heaters work. All amp chips work. I just dont get it. any ideas

merlin el mago 19th January 2013 02:06 PM

Have you checked semis: IRF510 & 2N3906?

dobiejoe 19th January 2013 03:54 PM

all four power amps work good. 6.7 to the heaters and 24 to the tube.

merlin el mago 19th January 2013 04:53 PM

If no signal in one channel inject 1KHz sinus and track with the scope where is lost the signal.

Simon B 19th January 2013 05:27 PM

1 Attachment(s)
Circuit as shown below?

dobiejoe 7th February 2013 03:58 PM

Still no sound out of left side.

Replaced all resisters with 1%
replaced trimmer pots with 2K and tried 10K
both heater amps work and both sides of the tube amps work.

Anything else I need to try?

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