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Old 10th July 2012, 09:13 PM   #1
Debo is offline Debo  United States
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Default New to tubes, SE guitar amp

I just recently got my hands on a hammond 272FX power transformer, 12ax7, and a J&J 6v6.

where do you guys, who know a lot more about this than me, think I should start?

Last edited by Debo; 11th July 2012 at 05:24 PM.
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Old 10th July 2012, 11:54 PM   #2
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Something like a Fender Champ -you'll need an output transformer also.
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Old 11th July 2012, 04:18 PM   #3
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Look at AX84.com. Circuit will be the same as with EL84 except that a higher cathode resistor is needed.
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Old 11th July 2012, 04:26 PM   #4
kevinkr is offline kevinkr  United States
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Per forum policy moving the guitar amp thread to Instruments And Amplifiers. Please read the sub header under each forum for the reason.
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Old 11th July 2012, 07:11 PM   #5
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Get a cheap single-ended transformer from www.webervst.com. Fond the schematic and layout for the fender champ 5F1 online. Figure out the bits and pieces you will need and pick them up at an electronics parts store or online. Go to the supermarket and get a medium size cake pan. When you get yer guitar to make noise though it into speaker you will never look back. Enjoy!!!

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Old 16th July 2012, 04:28 AM   #6
ChrisA is offline ChrisA  United States
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Quote:
Originally Posted by Debo View Post
I just recently got my hands on a hammond 272FX power transformer, 12ax7, and a J&J 6v6.

where do you guys, who know a lot more about this than me, think I should start?
The 272FX is "way bigger" than you need. But that is OK it allows a ton of filtering

Can you describe the sound you are looking for? Or maybe a genre of music.

For a high gain kind of sound you might want a second 12ax7 tube.

You are going to need an output transformer. Don't go cheap on that. That transformer is likely more important to the sound then which tube you use.

If you like a somewhat clean Fender Tweed sound try building a Fender "Champ" the AX84 type amp can be a bit more aggressive sounding. The major difference really is that the Fender Champ uses some negative feedback. I build one of each type amp and I think it is the NFB that makes them sound so different, There are MANY demos of the sound of each amp on youtube. Listen for a while then decide.

BTW I like the "Classic Tone" branded output transforms sold by Triode Eletronics. Very high quality for a mid range price.
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Old 16th July 2012, 09:51 PM   #7
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Rather than the 5F1 I would go for the added tone control of a Princeton.

http://ampwares.com/schematics/princeton_5f2a.pdf
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