EF 91 / Z77 Amp? help needed for newbie

spyk · 15th November 2004, 07:55 AM

Hi, i just found some valves in the garage on a lil old radio thing, but half the parts are missing, anyway, what i was wondering is, i have 4 of these valves, and im looking to make a little amp for electric guitar from them, but i dont even know where to start. im thinking 2 tubes for preamp and 2 for power amp section. can anybody help me out with a schematic design or anything here? i can do electronics, i have a gcses in it and its one of my hobbies, i just dont know much about tubes. thanks for any help

SHiFTY · 15th November 2004, 08:19 AM

The main thing is transformers: you will need a power transformer and a speaker transformer. If you have those then you can easily build a guitar amp. What are the other two valves?

You can make a really neat guitar amp from a single EL84 and a single 12AX7. Try www.ax84.com

I have also built several fender champ clones. This amp uses a 12AX7/ECC83 and a 6V6, and sounds awesome.

15th November 2004, 07:55 AM	#1
spyk diyAudio Member Join Date: Nov 2004 Location: england	EF 91 / Z77 Amp? help needed for newbie Hi, i just found some valves in the garage on a lil old radio thing, but half the parts are missing, anyway, what i was wondering is, i have 4 of these valves, and im looking to make a little amp for electric guitar from them, but i dont even know where to start. im thinking 2 tubes for preamp and 2 for power amp section. can anybody help me out with a schematic design or anything here? i can do electronics, i have a gcses in it and its one of my hobbies, i just dont know much about tubes. thanks for any help

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15th November 2004, 08:19 AM	#2
SHiFTY diyAudio Member Join Date: Jul 2002 Location: New Zealand	The main thing is transformers: you will need a power transformer and a speaker transformer. If you have those then you can easily build a guitar amp. What are the other two valves? You can make a really neat guitar amp from a single EL84 and a single 12AX7. Try www.ax84.com I have also built several fender champ clones. This amp uses a 12AX7/ECC83 and a 6V6, and sounds awesome.

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