Which tube does my amp use? 12AU7 12BH7 12AX7 6CG7 others?

[HP8903B]

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[Duke58]

It depends on what make and model. If you built it, can you post the schematic? You can't just post a photo of the tube socket and plug any tube that has the same number of pins.

Others will now answer...

 

[CraigSu]

Repost in the Tubes/Valves forum and include as much detail about the amp as possible.

 

[huggygood]

 

[Zung]

I think 6CG7 is what's (hand-)written on the chassis. Use a loupe and better lighting.

 

[huggygood]

first post " 27th November 2010, 06:59 AM "

 

[Duke58]

Why didn't anybody answer back then?

 

[huggygood]

i don't know...

 

[Francois G]

Why didn't anybody answer back then?

This question is not anwerable as posted.