Amplificator Class A 2 X EL504

[TURING]

I see you are from France. If the "Frenchman" to speak English is not good, that the Chinese speak English like a Martian.
Custom output transformer industry in China a lot. But I can not offer you custom, I'm just an audio enthusiasts. Do not participate in such business. Sorry. The power adapter is not when the single-ended output transformer used. Prone to magnetic saturation. And the primary coil inductance is not enough, will seriously damage frequency. In our case usually an ipad charger price you can buy a very nice crafted by professionals output transformer. This point I think we can let the world envy tube amp enthusiasts.
My English translations from google. Possible words do not convey.

 

[kevinkr]

Edcor will make a suitable custom single ended output transformer to order if you cannot find someone in the EU to make it for you. Shipping may be a problem due to cost.

Edcor fera un transformateur de sortie S.E adaptée à l'ordre si vous ne pouvez pas trouver quelqu'un dans l'UE de le faire pour vous. L'expédition peut être un problème en raison du coût. (Par Google Translate)

ici: EDCOR

 

[jean michel]

hey , very good 😉

EDCOR - GXSE15-8-2.5K

me possible up me build 😱

so , i me sorry to speak English , because , me old or not pratice langage ...

tks for all

 

[kevinkr]

Jean, once I was reasonably fluent in French. I've lost at least 70% of it since I was a kid. 😀
Depuis long temps je parle Francais presque courement, maintenant j'ai manque environ de 70%.. Quel horreur.. 😀

 

[Matt BH]

Kevin, it's lovely to see some French again. I too learnt it enough to get by but it is lost to me now. The same goes for German, I was pretty fluent in it. Funny how things get lost in memory over time.

I applaud you anyway. This is the way things should be.

Cheers

Matt.

 

[kevinkr]

Thanks Matt!

 

[jean michel]

hello ,

me use speak English to 1994 for radio = F4PZN / 91 😉

and me other hobby ; informatic to Intel & AMD , me start to AMSTRAD CPC 464 and up évolution 🙄

me blog : WINUX-91's blog - Blog de WINUX-91 - Skyrock.com

me project :

1 = ) 1 EY 81 - 2 ECL 805 , build is end to 15 days .

2 = ) me up build 1 ECC 81 - 2 PL 504 .

3 = ) me stock for new build 1 ECC 81 - 2 EL 508 .

4 = ) me stock for second new build 1 ECC 83 - 2 6v6gt ( RCA , used to réceive équipement military 😀 ) .

5 = ) possible copy to me 2 build project ( not use PL 504 go up EL 502 ) .

and 6 = ) possible build big PP to 1 ECC 83 - 4 6P45C 😱 .

i very bad ... 😀

so very good appréciate to build amplificator to tubes

many thanks for me help , so not expérimente so base électronic 😉

, good day for alls

 

[TURING]

I am currently using SCH provided for your reference. I'm going to finish it this week or next.

 

[jean michel]

hello ,

I not use to dubber of tension, i use transformer of TV with the HT has + 200 V 😉

me little CRC for test

 

[jean michel]

hello ,

me calculate new curve to charge trs 3 K ...

 

[jean michel]

hello ,

me up me build !

me use tube 12 AT 7 or 12 AX 7 for pré amp .

the build is problem to curve to oscilloscope 🙁

me change résistor to cathode to PL 504 = 680 Ohms

G2 is charged to résistor to série = 560 ohms .

the tube to pré amp test is 12 AT 7 or 12 AX 7 , charge plat is 180 Kohms and DEL connected to cathode .

1 résistor ajustable to 100 Kohms LOG is imput .

i me changed résistor to G1 , 1 capacitor = 0.27 µF in série to résistor = 470 Kohms for ground , input G1 = 2 Kohms .

2 test = 12 AT 7 is power 15 V CaC max and 12 AX 7 is Power 17 V Cac max .

big problem looking to oscilloscope 🙁

where is big problem ?

😕

 

[jean michel]

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.

hello ,

the build is change to mode triode , 1 W to 1000 Hertz at 8 Ohms to 135 V= HT .

sorry , i nooby to éléctronic build

🙁

 

[jean michel]

hello ,

I joins(contacts) a plan of the next assembly(editing), it is possible that there are errors there!

About a pourais to say to me if he(it) is correct in l together?

thank 😉

 

[jean michel]

hello all ,

My ampli is almost finished, it works well, me joins some photos of the assembly 😉

 

[jean michel]

hello all ,

😀 Ampli Proto 12AX7 - 2 PL504 - 150 V HT - Vidéo Dailymotion

me happy ...😉

 

[jean michel]

hello all ,

Here is my ampli proto pl504 almost finished, he will be modify later, his twin (EL 504) is in the course of study.
He will be just to use in case of breakdown

 

[jean michel]

hello ,

me news performance ...

Ampli Proto Stéréo PL504-12AX7S - 7W sous 8 Ohms a 1 Khz - Vidéo Dailymotion

i build multiplicator power to big doubler Latour , so use 56 V~ to upgrad in 200 V= approximatly 😀

the good power to test in 8 Ohms ; 7.56 W to 1 Khz , the OPT is torique , 230 V AC and 2 x 12 V DC in 30 VA , max gain possible use in 500 Hertz at 17.5 Kilohertz to 7.56 W , it is bad to 350 Hertz ( 4 W ) and 100 Hertz ( 1 W ) 🙁 .

news schema is up ! ( build power ) .

😉

 

[tikiroo]

Using a toroidal mains transformer as an output transformer for S/E use is not going to work very well as it will be saturated at very low levels of DC current. You really need to use proper air-gapped output transformers to get good performance.

 

[Blaireau]

We have already tried thoroughly to explain him that he was on the wrong way, in many french forums, but he still refuses to understand our explanations.
The best to do is to give up, because he's absolutely certain to be guided by a divine truth.
As he described himself as a genius, we think he does not need any help.
He'll rather soon teach us how we should all do...

 

[costis_n]

🙂

Ton solution. Hammond 125E