1626 / 6j4 tube amp

openback · 5th February 2012, 04:35 PM

My friend built this amp for me. It sounds quite nice though the gain is really low. Strange that I don't see any coupling caps. I asked him why and he just smile. Critics/suggestion are needed

Austin Translation · 8th February 2012, 01:48 PM

I want to build one just like it! Tho I am no expert, changing the plate resistor will allow more voltage swing (gain). I would think 100k would be good place to start and you could go higher but I have no experience with a 6j4.

If you put a 1 meg grid resistor instead of the 47k in there too, you could probably have a very sweet sounding guitar amp...

openback · 8th February 2012, 01:54 PM

Someone had pointed me to Bob Danielak website and there i saw this schematics that is very similar to mine. I will replace some caps/resistors on the amp and will have a good working amp based on a proven design. thanks for replying to my question

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8th February 2012, 01:48 PM	#2
Austin Translation diyAudio Member Join Date: Jan 2011	I want to build one just like it! Tho I am no expert, changing the plate resistor will allow more voltage swing (gain). I would think 100k would be good place to start and you could go higher but I have no experience with a 6j4. If you put a 1 meg grid resistor instead of the 47k in there too, you could probably have a very sweet sounding guitar amp...

8th February 2012, 01:54 PM	#3
openback diyAudio Member Join Date: May 2008	Someone had pointed me to Bob Danielak website and there i saw this schematics that is very similar to mine. I will replace some caps/resistors on the amp and will have a good working amp based on a proven design. thanks for replying to my question

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