• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Amplificator Class A 2 X EL504

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hello ,

i me stocked 2 tubes EL 504 for build amplificator 2 ways to EL504 .

i research montage to single ended ( for use 2 ways ) ?

i me research to Google.com , not good research completed to value schématic and spécification :(

sorry , me english is bad :rolleyes: .

http://www.diyaudio.com/forums/attachment.php?attachmentid=341336&stc=1&d=1365447815

me tested basic montage to 1 EL 504 to 34 V - 6.3 V :( , not possible test , so possible error ?
 

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hello ,

me build is stop it :(

so me transformator is very little for good use power , no probleme , the " solution " , HT to 180 V= is downgrade to good 90 V= ;)

me news build to short listing matérial .

2 PL 504 for connected to left and right to 90 V= , use 24 V~ to filament .

me power to 8 Ohms , is very little :p , use 0.0.. Watts RMS !!!

so not problem , is not drive installed for test .

me montage to screen ;) .

slow build is good appréciate to search link for build .

me first build , i me newbie , no problem , so looking build for up me good build .

bye all ;)

ps : me test to video ...

2 PL 504 en stéreo - 80 V= - Vidéo Dailymotion
 

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hello all ,

a stable version with my new transformer, j has to re-modify my assembly(editing) for obtenri moves forward badly because I am not good at arithmetic complex, me the power of mwatts 500, him(it) takes(brings) out in 2 x 8 ohms, have there some more of work has to make put the assembly(editing) is stable and he(it) have there not of 12 AX 7 d to use in l imédiat.

Has bientot
 

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hello ,

the build is upgrad for the test , the graphic is news .

and transformator " impédance " is 225 Ohms primary to 2 Ohms secondary ; me use 8 Ohms to speaker , not saturate voice !

no problem , so test for upgrad me build , only , no build transformator adapted .

tks ;)
 

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hello All ,

me project to amplificator 2 X EL/PL 504 is stopped !

i me very dificulte problem to calculate curve charge and excursion for use 12 AX 7 / ECC 83 .

the project is std-by and news project to use ECL 805 is créate ( copy to base ECL 86 ) .

the schéma for news build ... so éasy build , me juste change component for test and use .

me test is good and me ajusted to test power to news project ...

4.16 W rms to 6 ohms impédance HP so 1 Khz , litle problem for max power !

many thanks for all , good day
 

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Jean Michelle, choisi un vrai transformateur de sorti aproprie pour ta lampe avec simple PL504.. N'est pas possible a reussi avec trafo d'alimentation..

Translated: Choose a real output transformer appropriate for the single tube PL504. Not possible to succeed with power transformer.

My French is soooo rusty..
 
1k:8-ohm
185v power
Gate voltage-20v, anode-to-cathode voltage of about 165v, the load curve.If the impedance can be selected such that it is indeed the best. I use 3.5k-ohm, 285v out of frustration, just have these hands, and watched the curve pretty good, but some of the output power is small,only2.6W.
 

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Last edited:
hello ,

many thanks , so me English is bad ... lol :D

it is possible use Transformator " Torique " or not EI ?

me possible use transformator torique to 230 V ac and 2 x 6 V dc for use EL /PL 504 !

Or then I to find custom-made transformer?

tks for all ;)
 

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