Pse El34

Hojvaelde · 10th March 2006, 09:43 PM

Hello

I got 2 pcs power trafoes 350VAC 300 mA (no CT) + 6,3VAC 5A and 2 pcs 10H 300 mA chokes and 12 pcs new/used EL34 tubes. I got the parts for close to nothing.

I have decided to build 2 mono PSE EL34 amplifiers but i can't find any schematics. Help wanted.

Benny

lndm · 10th March 2006, 09:54 PM

To get parallel single ended. Just start with single single ended .

. Then double your output device, halve your cathode resistor (common to both devices or just use on each the same value as before), double the current capacity of your OPT, double the power supply capacitance, halve the output transformer's primary impedance requirement, and expect double the miller capacitance at the outputs grids.

Each el34 can therefore be biased as if it were alone.

Tubes4e4 · 11th March 2006, 05:50 AM

Hi Benny,

for example have a look at that one from Andrea Ciuffoli, using 4x EL34 in parallel SET

Be sure you want some serious output iron to cope with the high quiescient current.

Tom

10th March 2006, 09:43 PM	#1
Hojvaelde diyAudio Member Join Date: Jan 2005 Location: Denmark	Pse El34 Hello I got 2 pcs power trafoes 350VAC 300 mA (no CT) + 6,3VAC 5A and 2 pcs 10H 300 mA chokes and 12 pcs new/used EL34 tubes. I got the parts for close to nothing. I have decided to build 2 mono PSE EL34 amplifiers but i can't find any schematics. Help wanted. Benny

11th March 2006, 05:50 AM	#3
Tubes4e4 diyAudio Member Join Date: Jul 2005 Location: Leverkusen	Hi Benny, for example have a look at that one from Andrea Ciuffoli, using 4x EL34 in parallel SET Be sure you want some serious output iron to cope with the high quiescient current. Tom __________________ If in doubt, just measure.

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10th March 2006, 09:54 PM	#2
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	To get parallel single ended. Just start with single single ended . . Then double your output device, halve your cathode resistor (common to both devices or just use on each the same value as before), double the current capacity of your OPT, double the power supply capacitance, halve the output transformer's primary impedance requirement, and expect double the miller capacitance at the outputs grids. Each el34 can therefore be biased as if it were alone.

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