el34 se schematic opinion

trancy · 21st April 2004, 12:16 PM

I found simple schematic fot SE with el34, and i want to ask you all, if its ok or should I change something ...I havent so much expirience with tubes like you boys.....

thanks

NickC · 21st April 2004, 03:27 PM

Looks fine but don't expect to much power at that B+ level. Say around 2watts. I used mine at 400volts on the plate to get 3.5 watts. I say go for it. Carefull with the feedback connection only, the rest is allright. I find that due to the feedback, some buzzing might take place. But SE with some small amounts of feedback is great and ideal for better bass control

Roger Hill · 21st April 2004, 03:37 PM

Replace the 1N4007 diodes with UF4007 diodes and instead of the bridge rectifier shown for the filaments, build a bridge with four Schottky 5 amp diodes, all available from Mouser. Use a small piece of perf board from Radio Shack to build the filament bridge. Have fun!

Roger Hill

Roger Hill · 21st April 2004, 03:52 PM

Oops! Just noticed where you are. Go ahead and build as designed. If you then want to try the Uf/Schottkys send me an e-mail with your mailing address and I'll build replacement rectifiers for you. The components are easily available and inexpensive here in the USA.

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21st April 2004, 03:27 PM	#2
NickC diyAudio Member Join Date: Dec 2001 Location: Earth	Looks fine but don't expect to much power at that B+ level. Say around 2watts. I used mine at 400volts on the plate to get 3.5 watts. I say go for it. Carefull with the feedback connection only, the rest is allright. I find that due to the feedback, some buzzing might take place. But SE with some small amounts of feedback is great and ideal for better bass control

21st April 2004, 03:37 PM	#3
Roger Hill diyAudio Member Join Date: Jan 2004 Location: Colorado Springs	Replace the 1N4007 diodes with UF4007 diodes and instead of the bridge rectifier shown for the filaments, build a bridge with four Schottky 5 amp diodes, all available from Mouser. Use a small piece of perf board from Radio Shack to build the filament bridge. Have fun! Roger Hill

21st April 2004, 03:52 PM	#4
Roger Hill diyAudio Member Join Date: Jan 2004 Location: Colorado Springs	Oops! Just noticed where you are. Go ahead and build as designed. If you then want to try the Uf/Schottkys send me an e-mail with your mailing address and I'll build replacement rectifiers for you. The components are easily available and inexpensive here in the USA.