EL34 SE

Here are the Circuit diagrams for single ended amplifierer with: 300B, EML300B-Mesh, EML300B-XLS, EML1605, KT120

EL34 SE

Postby J. Leven » Sun Jan 06, 2013 6:23 pm

a new schematic is placed,
LE - EL34 SE Amp 1
http://4tubes.com/SCHEMATICS/LUNDAHL-TR ... /index.htm

J.L.
J. Leven
 
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Re: EL34 SE

Postby ecata » Fri Feb 08, 2013 12:28 pm

it's the configuration for LL1623 3k ultralinear 50%?
are pins 1 and 8 of the EL 34 connected together and connected to the 31v auto bias?
what 'is voltage and amperage of the secondaries of the power transformer?
LL1650 has 2 secondary to 173V 0.63A to be connected together, is that right?
3 secondary 6.3V are used for the tube filaments: it's the last one unused?

thanks for your help.
ecata
 
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Re: EL34 SE

Postby J. Leven » Fri Feb 08, 2013 7:38 pm

it's the configuration for LL1623 3k ultralinear 50%?
yes
are pins 1 and 8 of the EL 34 connected together and connected to the 31v auto bias?
yes, 1 and 8 connected at the tube socket, and connected to the auto bias resistor
what 'is voltage and amperage of the secondaries of the power transformer?
LL1650 has 2 secondary to 173V 0.63A to be connected together, is that right?
346 V AC, 0,63 A
3 secondary 6.3V are used for the tube filaments: it's the last one unused?
yes, not in use

J.L.
J. Leven
 
Posts: 171
Joined: Fri Jan 13, 2012 12:27 pm

Re: EL34 SE

Postby ecata » Mon Feb 18, 2013 11:14 am

can I replace the EL34 with kt120?
what changes should I do?
ecata
 
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Re: EL34 SE

Postby J. Leven » Mon Feb 25, 2013 2:16 pm

Hello ecata,
the best solution is you take this schematic ;)
http://4tubes.com/SCHEMATICS/LUNDAHL-TR ... -KT120.htm

J.L.
J. Leven
 
Posts: 171
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Re: EL34 SE

Postby HaHe » Wed Nov 11, 2015 8:23 pm

Which choke should be taken in the new edition of the PSU? LLXXXX ???
HaHe
 
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Re: EL34 SE

Postby J. Leven » Thu Nov 12, 2015 9:52 am

Hallo,
aus zeitlichen Gründen habe ich diese Beschaltung der Drossel praktisch nicht getestet,
der Ruhestrom ist ca. 280mA für Stereo, 5 H

evtl. Jac fragen

Grüße J.L.
J. Leven
 
Posts: 171
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Re: EL34 SE

Postby eripech » Tue Apr 18, 2017 11:08 am

can this amp also be done using 1/2 ECC82 (single preamp stage only) - or is this just sufficient amplification for pentode mode and triode wouldnt work?

why its done using 3k output transformer - do you use 4Ohm secondary connection for your 8 Ohm Speaker setting (sorry for questioning, but the data sheet is confusing)?

- BR ERICH
eripech
 
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Re: EL34 SE

Postby J. Leven » Fri Apr 21, 2017 6:31 am

Hi,
you need one ECC82 for the driver section ,
the EL34 runs in ultralinear mode , that is between triode and pentode
this working mode is similar unisonresearch tube amps

use connection C for 8 Ohm speaker ,
the reason is lower distrotion and you need only a smaller feedback

J.L.
J. Leven
 
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